PUMAWBOL (E1.3) & LPWBOL (A1.1)

Pushbutton with green lamp: START OIL WARM-UP.
Green light blinks if, after a start command, automatic cycle cannot start due to faulty or missing consents, which are monitored by lamps and displays.
Green light stays on if, after a start command, automatic cycle starts correctly.

PUARWBOL (E1.4)

Red Pushbutton: STOP OIL WARM-UP.
START and STOP COMMANDS of the AUTOMATIC CYCLE, in LOCAL OPERATION, for refrigeration of the oil by means of the control of the valves of the chilled water circuit.

Commands in Manual or Test Operation Mode

SLVVRN1 (E1.5) and SLVVRN2 (E1.6)

2 position Selector Switch to control CHILLED WATER.
VALVE (1) - VALVE (2)

LPVVRN1 (A1.2) and LPVVRN2 (A1.3)

2 blue LEDS to monitor the selected valve.

SLEVPWOL (E1.7) and SLEVSCOL (E2.0)

2 position Selector Switch for the SOLENOID VALVE OF THE HYDROSTATIC PADS:
OIL FEED - OIL RELIEF

LPEVPWOL (A1.4) and LPEVSCOL (A1.5)

2 blue LEDS monitor the selected position FEED - RELIEF

Selector Switch SLEVPWOL in enabled only in TEST MODE.

PHRFVVHO (input an)

Potentiometer (0%-100%) controls the opening of the regulation VALVE of the CHILLED WATER.

The operator sets on the potentiometer PHRFVVHO, which is enabled only in TEST MODE, the analog reference signal to operate the chilled water valve with selector switch SLVVRN1 and SLVVRN2.

PHSATURF (input an)

Potentiometer (-10C / +25C) to SIMULATE the REFERENCE TEMPERATURE.

The operator sets on the potentiometer PHSATURF, which is enabled only in TEST MODE, the analogic reference signal representing the reference temperature for the system for hydrostatic pads oil thermal conditioning.

LPSZPH (A1.6)

Green Lamp.
Green light monitors selected potentiometers in TEST MODE.

Manual Control of Pumps in Local Operation

OIL FEED CIRCUIT TO HYDROSTATIC PADS

PUMAPW1 (E2.5) with LPMAPW1 (A2.1)

PUSHBUTTON with green LAMP: START OIL FEED PUMP (1) OPERATION.
Green light blinks if, after a start command, pump does not start due to faulty or missing consents, which are monitored by lamps and displays.
Green light stays on if, after a start command, pump cycle starts correctly.

PUARPW1 (E2.6)

Red Pushbutton: STOP OIL FEED PUMP (1) OPERATION.

PUMAPW2 (E2.7) with LPMAPW2 (A2.2)

PUSHBUTTON with green LAMP: START OIL FEED PUMP (2) OPERATION.
Green light blinks if, after a start command, pump does not start due to faulty or missing consents, which are monitored by lamps and displays.
Green light stays on if, after a start command, pump cycle starts correctly.

PUARPW2 (E3.0)

Red Pushbutton: STOP OIL FEED PUMP (2) OPERATION.

OIL REFRIGERATION AND FILTERING CIRCUIT

PUMARC1 (E2.1) with LPMARC1 (A1.7)

PUSHBUTTON with green LAMP: START OIL FILTERING PUMP (1) OPERATION.
Green light blinks if, after a start command, pump does not start due to faulty or missing consents, which are monitored by lamps and displays.
Green light stays on if, after a start command, pump cycle starts correctly.

PUARRC1 (E2.2)

Red Pushbutton: STOP OIL FILTERING PUMP (1) OPERATION.

PUMARC2 (E2.3) with LPMARC2 (A2.0)

PUSHBUTTON with green LAMP: START OIL FILTERING PUMP (2) OPERATION.
Green light blinks if, after a start command, pump does not start due to faulty or missing consents, which are monitored by lamps and displays.
Green light stays on if, after a start command, pump cycle starts correctly.

PUARRC2 (E2.4)

Red Pushbutton: STOP OIL FILTERING PUMP (2) OPERATION.

 

Monitoring Lamps

OIL FEED CIRCUIT TO HYDROSTATIC PADS

LPTMOLFT (A8.1)

Red Lamp.
When on, it monitors OVERTEMPERATURE of the OIL in TANK.

LPLZOLFT (A8.0)

Red Lamp.
When on, it monitors LOW OIL LEVEL IN MAIN TANK.

LPPSMN1 (A8.2)

Red Lamp.
When on, it monitors LOW PRESSURE OF OIL FROM PUMP (1)

LPPSMN2 (A8.3)

Red Lamp.
When on, it monitors LOW PRESSURE OF OIL FROM PUMP (2)

LPPSMSOL (A8.4)

Red Lamp.
When on, it monitors OVERPRESSURE IN OIL FEED CIRCUIT.

OIL REFRIGERATION AND FILTERING CIRCUIT

LPASFT1 (A2.3)

Green Lamp.
When on, it monitors INLET FILTER (1) IN OPERATION

LPIOFT1 (A2.4)

Red Lamp.
When on, it monitors INLET FILTER (1) IN CLOGGED CONDITION

LPASFT2 (A2.5)

Green Lamp.
When on, it monitors INLET FILTER (2) IN OPERATION

LPIOFT2 (A2.6)

Red Lamp.
When on, it monitors INLET FILTER (2) IN CLOGGED CONDITION

LPMDFT3 (A2.7)

Green Lamp.
When on, it monitors DELIVERY FILTER (1) IN OPERATION

LPIOFT3 (A3.0)

Red Lamp.
When on, it monitors DELIVERY FILTER (1) IN CLOGGED CONDITION

LPMDFT4 (A3.1)

Green Lamp.
When on, it monitors DELIVERY FILTER (2) IN OPERATION

LPIOFT4 (A3.2)

Red Lamp.
When on, it monitors DELIVERY FILTER (2) IN CLOGGED CONDITION

LPLZOLRC (A3.7)

Red Lamp.
When on, it monitors LOW OIL LEVEL IN RECOVERY TANK.

LPLMOLRC (A3.6)

Red Lamp.
When on, it monitors HIGH OIL LEVEL IN RECOVERY TANK.

LPFLOLFT (A3.5)

Red Lamp.
When on, it monitors INSUFFICIENT FLOW OF CONDITIONED OIL.

LPFLHORN (A3.4)

Red Lamp.
When on, it monitors INSUFFICIENT FLOW OF CHILLED WATER.

LPTMHORN (A3.3)

Red Lamp.
When on, it monitors OVERTEMPERATURE OF CHILLED WATER.

DISPLAYS OF DATA AND ALARMS

VZAL

DISPLAY, alphanumeric, 2 lines and 32 characters, to MONITOR ALARMS and WARNINGS with a maximum of 200 messages.

LPVIAL

Red Lamp.
When on, it monitors that ALARM or WARNING is present.

PURPAL (E3.7)

Yellow Pushbutton.
To RESET Warnings and ALARMS.

PURPSIAL (E3.6)

Yellow Pushbutton.
To SILENCE the Horn.

The Display VZAL can memorize up to 16 messages at the same time, they are transmitted serially from PLC.
The numeric section (2 digits) displays the number of messages present at the same time.
Yellow Pushbutton, included in the display, scans the messages and displays them in order of there priority: the priority is defined by the code associated to the message.

VZOLID

3 Digit DISPLAY to monitor the PRESSURE of the OIL of the HYDROSTATIC PADS.

VZRFVVHO

3 Digit DISPLAY to monitor the PREFERENCE SIGNAL TO CONTROL the VALVES of the CHILLED WATER.

VZTURF

3 Digit DISPLAY plus SIGN to monitor the REFERENCE TEMPERATURE OF THE STRUCTURE OF THE TELESCOPE.

VZRVTU

3 Digit DISPLAY plus sign, multiplexed, to monitor the TEMPERATURES of EACH SENSOR and the AVERAGES of the AREAS (RTMS, STMS, PTMS, TTMS, WTMS).

PUSZ-ST (E14.6) with LPSZ-ST (A10.0)

PUSHBUTTON with white LAMP.
White light monitors SELECTION of DISPLAY of the TEMPERATURES of the STATIONARY STRUCTURE (STMS).

PUSZ-RT (E14.6) with LPSZ-RT (A10.1)

PUSHBUTTON with white LAMP.
White light monitors SELECTION of DISPLAY of the TEMPERATURES of the ROTARY STRUCTURE (RTMS).

PUSZ-PT (E15.0) with LPSZ-PT (A10.2)

PUSHBUTTON with white LAMP.
White light monitors SELECTION of DISPLAY of the TEMPERATURES of the HYDROSTATIC PADS (PTMS).

PUSZ-TT (E15.1) with LPSZ-TT (A10.3)

PUSHBUTTON with white LAMP.
White light monitors SELECTION of DISPLAY of the TEMPERATURES of the OIL in the MAIN TANK (TTMS).

PUSZ-WT (E15.2) with LPSZ-WT (A10.4)

PUSHBUTTON with white LAMP.
White light monitors SELECTION of DISPLAY of the TEMPERATURES of the CHILLED WATER (WTMS).

PUSZTU1 (E15.3) with LPSTZU1 (A11.0)

PUSHBUTTON with white LAMP.
White light monitors SELECTION of DISPLAY of the TEMPERATURE SENSOR 1 (T1).

PUSZTU2 (E15.4) with LPSTZU2 (A11.1)

PUSHBUTTON with white LAMP.
White light monitors SELECTION of DISPLAY of the TEMPERATURE SENSOR 2 (T2).

PUSZTU3 (E15.6) with LPSTZU3 (A11.2)

PUSHBUTTON with white LAMP.
White light monitors SELECTION of DISPLAY of the TEMPERATURE SENSOR 3 (T3).

PUSZTU4 (E15.6) with LPSTZU4 (A11.3)

PUSHBUTTON with white LAMP.
White light monitors SELECTION of DISPLAY of the TEMPERATURE SENSOR 4 (T4).

PUSZTUMI (E15.7) with LPSTZUMI (A11.4)

PUSHBUTTON with white LAMP.
White light monitors SELECTION of DISPLAY of the AVERAGE TEMPERATURE of the SENSORS (MI) related to the selected area (RTMS, STMS, PTMS, TTMS).

The Pushbuttons above listed are used to select the area related to the measure (STMS, RTMS, PTMS, TTMS, WTMS) and related temperature sensor or the average value of the temperatures (T1, T2, T3, T4, TM).
The white light related to the pressed pushbutton goes on. When display of temperature average (TM) is selected, all lights related to the sensors which concur to the computation of the temperature average go on.

PUTPLP (E3.5)

White Pushbutton
To test lights and displays.

General Alarms

PUAREM (E11.4)

Red mushroom PUSHBUTTON.
EMERGENCY STOP.

PUARGE (E11.5)

Selector Switch.
GENERAL STOP

SISGAL (A8.6)

HORN
When on, it monitors the presence of WARNINGS.

LPEMCU (A8.5)

Red Lamp
When on, it monitors MAIN COMPUTER EMERGENCY M.C.P.=ESDIN

LPAREM

Red Lamp
When on, it monitors LOCAL CONTROLLER IMMEDIATE EMERGENCY (L.C.I.E.=ESDOUT)

INTERFACE BETWEEN SIMATIC S5 PLC AND REMOTE ESO COMPUTER

ESO COMPUTER and SIMATIC PLC have the following information interchange:

1) Operation mode selections and commands from ESO COMPUTER to PLC
2) Operation mode selections and commands from PLC to ESO COMPUTER
3) Status signals related to Bearing System Controller (BSC) and Temperature Measuring System (TMS) from PLC to ESO COMPUTER
4) Alarm and warning signals related to BSC and TMS from PLC to ESO COMPUTER
5) Measurement and reference analog signals from PLC to ESO COMPUTER

The groups of signals 1 and 2 are exchanged in parallel using one I/O logic interface for each signal.

To exchange the signals concerning groups 3, 4 and 5 a multiplexed parallel transmission system used, consisting of 16 lines for DATA and 7 lines for ADDRESS, as shown in figure 1 in which is described the complete functional connection between ESO COMPUTER and PLC.

List and Description of the Interface Signals

Before describing the hardware interface and the multiplexed parallel transmission protocol, the groups of interface signals are listed below.

Operation Mode Selection and Command Signals Directly Transmitted by ESO COMPUTER:

AU/MHSZ (E13.2)

selection of automation mode of operation:
modal signal (1=automation mode; 0=manual mode)

NR/DUSZ (E13.3)

selection of normal mode of operation:
modal signal (1=normal mode; 0=degraded mode)

STARTAU (E13.4)

start automatic sequence of BSC:
impulsive signal (1=Start)

STOPAU (E13.5)

stop automatic sequence of BSC:
impulsive signal (1=Stop)

STWARMUP (E13.6)

start warm-up sequence:
impulsive signal (1=Start)

COMREST (E13.7)

commands reset:
impulsive signal (1=Reset)

ALRESET (E14.0)

Alarm reset:
impulsive signal (1=Reset)

EMSTOPU (E14.1)

emergency stop from ESO:
modal signal (0=Stop)
After shut-off procedure execution, the main supply to BSC is switched off.

GESTOP (E14.2)

General stop from ESO:
modal signal (0=Stop)
After shut-off procedure execution, the main supply to BSC is not switched off.

ASMO (E14.3)

Telescope in motion
modal signal (1=movement)
With this signal on 1, the BSC supply is not switched off.

The impulsive signals from ESO COMPUTER must be at least 500msec long.

Operation Mode Selection and Command Signals Directly Transmitted by PLC:

SZMH (A16.0)

selection of the manual mode of operation:
modal signal (1=manual)

SZTP (A16.1)

selection of the test mode of operation:
modal signal (1=test)

SZAU (A16.2)

selection of the automatic mode of operation:
modal signal (1=automatic)

SZOPRT (A16.3)

selection of the remote mode of operation:
modal signal (1=remote; 0=local)

SZOPNR (A16.4)

selection of normal environment:
modal signal (1=normal; 0=degraded)

MAAU (A16.5)

BSC automatic sequence activated:
modal signal (1=automatic cycle in execution; 0=automatic cycle stopped)

MAWBOL (A16.6)

oil warm-up sequence activated:
modal signal (1=warm-up activated; 0=warm-up stopped)

SZVVRN1 (A16.7)

selection of the chilled water regulation valve1:
modal signal (1=valve1 selected)

SZVVRN2 (A17.0)

selection of the chilled water regulation valve2:
modal signal (1=valve2 selected)

SZEVPWOL (A17.1)

oil feed/relief electrovalve command to hydrostatic pads:
modal signal (1=oil feed; 0=oil relief)

MAMPRC1 (A17.2)

oil filtering pump 1 avtivated:
modal signal (1=pump1 activated; 0=pump1 stopped)

MAMPRC2 (A17.3)

oil filtering pump 2 avtivated:
modal signal (1=pump2 activated; 0=pump2 stopped)

MAMPPW1 (A17.4)

oil feed pump 1 activated:
modal signal (1=pump1 activated; 0=pump1 stopped)

MAMPPW2 (A17.5)

oil feed pump 2 activated:
modal signal (1=pump2 activated; 0=pump2 stopped)

WBOL-OK (A17.7)

1= oil adjustment to tolerance values
0= oil adjustment out of tolerance

ALIS (A18.0)

immediate alarms:
modal signal (1=normal operation; 0=alarm intervention)

ALRI (A18.1)

delayed alarms and warnings:
modal signal (1=normal operation; 0=alarm/warning intervention)

ALMX (A18.2)

multiple alarm/warnings:
modal signal (1=multiple alarm/warnings present; 0=no multiple alarms/warnings)

AREM (A18.3)

BSC instantaneous emergency stop:
modal signal (1=normal operation; 0=emergency stop)

ARGE (A18.4)

BSC instantaneous general stop:
modal signal (1=normal operation; 0=general stop)

ARIS (A18.5)

BSC instantaneous stop request to ESO computer (ESDOUT signal):
modal signal (1=normal operation; 0=instantaneous stop command)

Status Signals of BSC and TMS Transmitted by PLC via Multiplexed Parallel Lines

The status signals related to the PLC inputs from sensors and switches are organized in the following five words of 16 bits, which can be addressed by ESO COMPUTER:

- CKELTU: word address 1F

Threshold signals from the analog sensors supply/conditioning electronic units: each binary signal gives information if the measurement analog signal ranges within the absolute minimum and maximum limits set in the electronic unit (see figure 2).


1F/0 CKEL1RT 1F/1 CKEL2RT 1F/2 CKEL3RT 1F/3 CKEL4RT	min/max thresholds of thermistors of rotating structure (RTMS)
1F/4 CKEL1ST 1F/5 CKEL2ST 1F/6 CKEL3ST 1F/7 CKEL4ST	min/max thresholds of thermistors of stationary structure (STMS)
1F/8 CKEL1PT 1F/9 CKEL2PT 1F/10 CKEL3PT 1F/11 CKEL4PT	min/max thresholds of thermistors of hydrostatic pads (PTMS)
1F/12 CKEL1TT 1F/13 CKEL2TT	min/max thresholds of thermistors of oil tank (TTMS)
1F/14 CKELWT	min/max threshold of chilled water thermistor
1F/15 -

(1 = measurement signal within range; 0 = measurement signal out of range).

- OVF1: word address 20

Signals of overflow PLC analog input board.


20/0 OVF-RTT1 20/1 OVF-RTT2 20/2 OVF-RTT3 20/3 OVF-RTT4	overflow analog input RTT1 thermistor overflow analog input RTT2 thermistor overflow analog input RTT3 thermistor overflow analog input RTT4 thermistor
20/4 OVF-STT1 20/5 OVF-STT2 20/6 OVF-STT3 20/7 OVF-STT4	overflow analog input STT1 thermistor overflow analog input STT2 thermistor overflow analog input STT3 thermistor overflow analog input STT4 thermistor
20/8 OVF-PTT1 20/9 OVF-PTT2 20/10 OVF-PTT3 20/11 OVF-PTT4	overflow analog input PTT1 thermistor overflow analog input PTT2 thermistor overflow analog input PTT3 thermistor overflow analog input PTT4 thermistor
20/12 OVF-TTT1 20/13 OVF-TTT2	overflow analog input input TTT1 thermistor overflow analog input input TTT2 thermistor
20/14 OVF-WT	overflow analog input WT thermistor
20/15 OVF-PROL	overflow analog input PROL thermistor

- OVF2: word address 21

Signals of overflow PLC analog input boards.


21/0 OVF-PHVV	overflow analog input PHVV thermistor
21/1 OVF-PHTU	overflow analog input PHTU thermistor
21/2 OVF-RN1	overflow analog input RN1 thermistor
21/3 OVF-RN2

 

21/4 21/5 21/6 21/7 21/8 21/9 21/10 21/11 21/12 21/13 21/14 21/15

- - - - - - - - - - - -

- FTRNOL: word address 22

Signals of the ON-OFF sensors located in the oil filtering and conditioning unit.


22/0 22/1 22/2 22/3 22/4 22/5 22/6 22/7 22/8 22/9 22/10 22/11 22/12 22/13 22/14 22/15

SWRGH01 SWRGH02 FLHORN LZOLRC1 LZOLRC2 LMOLRC SWASFT1 SWASFT2 SWABFT1 SWABFT2 SWMDFT3 SWMDFT4 SWABFT3 SWABFT4 SWMPRC1 SWMPRC2


The identification names of the above signals are explained in INNSE Technical Specification DT 16529.

- PWOLID: word address 23

Signals of the ON-OFF sensors located in the oil feed unit and in the hydrostatic support system and of the sensors in the electrical cabinets.


23/0 23/1 23/2 23/3 23/4 23/5 23/6 23/7 23/8 23/9 23/10 23/11 23/12 23/13 23/14 23/15

PSMNOL1 PSMNOL2 PSMSOLID PSMNOLID LZOLFT FLOLFT SWMPPW1 SWMPPW2 CKTMOLFT - AQVEQQ CKPWEL CKPWTL CKPWVV CKSIGECC -

Anemometric switch of the cabinet fan Presence of +/- 24Vdc supply to electronic units Presence of 110Vac supply to power relay Presence of 24Vac supply to chilled water regulation valves


The identification names of the sensors located in the hydraulic feed unit are explained in INNSE technical specification DT 16529.

Alarm and Warning Codes of BSC and TMS Transmitted by PLC via Multiplexed Parallel Lines

The ALARM/WARNING codes, identified by integer numbers in decreasing priority order, are listed and explained below:

fault

no.	code	Name	Description
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30	1 2 3 4 5 6 7 8 9 A B C D E F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E	ALPSMNID ALPSMSID ALPWTL ALPWEL ALPWVV ALPSMN1 ALPSMN2 - ALPSMSOL ALLZOLFT ALTMOLFT ALTUMIRT ALTUMIST ALTUMIPT ALTUMITT - ALSZMPPW ALMPPW1 ALMPPW2 ALTMHO ALDAAG ALDAMAX ALELTU ALFLOLFT ALMPRC1 ALMPRC2 ALSZMPRC ALLZOLRC ALLMOLRC ALRFVV	Min pressure hydrostatic pads Max pressure hydrostatic pads 110 Vac supply breakdown 24 Vdc supply breakdown 24 Vac supply breakdown Min pressure oil feed pump 1 Min pressure oil feed pump 2 free Max pressure oil feed pumps 1 and 2 Min level conditioned oil tank Max temperature conditioned oil Thermistors out of tolerance (RTMS) Thermistors out of tolerance (STMS) Thermistors out of tolerance (PTMS) Thermistors out of tolerance (TTMS) Free Wrong selection of oil feed pumps1 and 2 Oil feed pump1 failure Oil feed pump2 failure Max temperature chilled water Wrong A/D conversion of the analog measurement signals Max range of analog measure min/max thershold alarm intervention min flow of filtered and conditioned oil Oil filtering pump 1 failure Oil filtering pump 2 failure Wrong selection of oil filtering pumps 1 and 2 Min level oil drain tank Max level oil drain tank Valve adjustment not completed

 

fault

no.	code	Name	Description
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50	1F 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32	ALASFT1 ALASFT2 ALMDFT3 ALMDFT4 ALFHORN ALSZRGHO ALTR ALSIGE ALSIEL ALWB - - SGASFT1 SGASFT2 SGMDFT3 SGMDFT4 ALSZFTAS ALSZFTMD ALAQVEQQ SGMITU	Inlet filter clogged (alarm) Inlet filter 2 clogged (alarm) Delivery filter 3 clogged (alarm) Delivery filter 4 clogged (alarm) Min flow chilled water Wrong selection of chilled water regulation valves1 and 2 Faulty data transmission to ESO computer Faulty connectors to BSC cabinet Faulty connectors to ESO interface Oil adjustment not completed Free Free Filter 1 clogged (warning) Filter 2 clogged (warning) Filter 3 clogged (warning) Filter 4 clogged (warning) Wrong selection of the filters 1 and 2 Wrong selection of the filters 3 and 4 Absence of ventilation inside electrical cabinet Mean temp. computation not considering all involved temp. sensors

 

The alarm 12, 13, 14, 15 and the warning 50 are related to the PLC computation of the temperature mean values of the different zones (RTMS, STMS, PTMS, TTMS).
The codes are generated when the PLC cannot consider all the involved thermistors in the computation, due to excessive differences between the sensors measurements.
The alarm 12, 13, 14 and 15 are generated if the measurement differences involve the 50% of the sensors (i.e. 2 thermistors for the zones RTMS, STMS and PTMS and 1 thermistor for the zone TTMS).
The warning 50 is generated if only 1 thermistor measurement is different in the zones RTMS, STMS and PTMS.

In the word TUMI, address 24h, is stored the information about the thermistors considered by the PLC for the computation of the mean values of temperatures: for each thermistor one bit of the word TUMI is used to indicate whether the thermistor analog signal is "in tolerance" or not:




Bit = 1 :	thermistor in tolerance for mean temperature computation
Bit = 2 :	thermistor out of tolerance for mean temperature computation

 

24/0 24/1 24/2 24/3	TU1MIRT TU2MIRT TU3MIRT TU4MIRT	Thermistors considered for the temperature mean value computation of the zone RTMS
24/4 24/5 24/6 24/7	TU1MIST TU2MIST TU3MIST TU4MIST	Thermistors considered for the temperature mean value computation of the zone STMS
24/8 24/9 24/10 24/11	TU1MIPT TU2MIPT TU3MIPT TU4MIPT	Thermistors considered for the temperature mean value computation of the zone PTMS
24/12 24/13 24/14 24/15	TU1MITT TU2MITT - -	Thermistors considered for the temperature mean value computation of the zone TTMS

 

The ESO COMPUTER, calling the TUMI word address 24h, requires to PLC the transmission of the bits, that give the information about the thermistors considered or not in the mean temperature computation.

Measurement and Reference Analog Signals Transmitted by PLC via Multiplexed parallel Lines

The following measurement signals and reference signal and mean values computed by
PLC:

- - - - - -

14 temperature signals of thermistors 3 average structure temperature signals rotating structure temperature (RTMS) stationary structure temperature (STMS) hydrostatic pads temperature (PTMS) 1 oil tank average temperature signal (TTMS) reference temperature for oil conditioning 1 position reference signal to the selected chilled water regulation valve hydrostatic pads oil pressure

are defined and called with different binary (exadecimal) address:

ADDRESS

DEFINITION

1 2 3 4 5 6 7 8 9 A B C D E F 10 11 12 13 14 15 16 17 18

Rotating structure temperature transducer 1 Rotating structure temperature transducer 2 Rotating structure temperature transducer 3 Rotating structure temperature transducer 4 Stationary structure temperature transducer 1 structure temperature transducer 2 structure temperature transducer 3 structure temperature transducer 4 Pads temperature transducer 1 Pads temperature transducer 2 Pads temperature transducer 3 Pads temperature transducer 4 Oil tank temperature transducer 1 Oil tank temperature transducer 2 H2O temperature Average rotating structure temperature Average stationary structure temperature Average hydrostatic pads temperature Average oil tank temperature Reference temperature (for oil regulation) H2O regulation valve reference Hydrostatic pads oil pressure RN 1 RN 2

The measurement data are given in binary form: the temperature values are in 1/10 of degree centigrade, the pressure value in 1/10 of bar and the valve position reference in % of max reference.

The addresses are called by ESO COMPUTER.

Description of the Hardware Protocol and Transmission Protocol

The hardware interface between SIMATIC S5 PLC an ESO COMPUTER is realized
using:

- no.1 32 digital input non optoinsulated card with 24 Vdc voltage positive logic

- no.2 32 digital output non optoinsulated cards with 24 Vdc voltage 0.12A current positive logic.

The I/O interface cards of ESO COMPUTER use TTL inverse logic.

To interface the above I/O cards of PLC with ESO COMPUTER I/O cards providing 24V/TTL conversion and the voltage insulation,
the following INNSE adaptor cards are used:

- no.1 TTL/24V optoinsulators (see dwg. 9816.28786) between ESO COMPUTER outputs and PLC inputs: 19 channels available

- no.3 24V/TTL optoinsulators (see dwg. 9816.28787) between PLC outputs and ESO COMPUTER inputs: 18 channels available for each card.

The INNSE cards 9816.22786 and 9816.22787 require a 5V TTL externally supplied by ESO COMPUTER on pins AA (+5V) and BB(OV) of connector J4 of the INNSE rack.

INNSE suggests to put the small rack containing these adaptor cards (1+3 cards) inside the cabinets, that contains the ESO COMPUTER I/O interface rack, as shown in figure 3, to reduce the length of the transmission line at 5V and to carry outside the cabinet the 24V line, which is less sensitive to disturbances; this solution will be available with the final cabinet. For the tests in INNSE shop of Brescia, the interconnections will be tested with a simulator provided by INNSE.

The cards are contained in a panel-mountable rack having these max overall dimensions
(see enclosed drawing - figure 6):

length = 395 mm
height = 132,5 mm
depth = 255 mm

The signal transmission protocols are two:

- direct transmission of the signals listed in the groups 1 and 2
- multiplexed-parallel transmission of the signals listed in the groups 3, 4 and 5.

For what concern the alarm/warning and status signals, there are approximately 50 signals stored in the PLC memory.

The faults occurring in the electrical and hydraulic equipments (BSC, POU, HSS, TMS) (both permanent and transient) are latched by the PLC and are associated to alarm binary codes stored in dedicated PLC memory areas.

The alarms are divided in three groups:

- the non-immediate alarms (called warnings)
- the immediate electronic alarms (called alarms type 1)
- the immediate mechanical and hydraulic alarms (called alarms type 2).

For the warnings and for the immediate alarms type 1 and 2 two direct logic signals are assigned, which are used by the PLC to inform the ESO computer that a fault occurred (direct signals ALRI and ALIS).

An additional direct logic signal is used (namely "multiple alarm/warning" ALMX) to indicate that more than one fault has been latched.

The ESO computer, receiving the alarm information from one or more of the two above direct signals, sends to the PLC an alarm code requirement using a dedicated ADDRESS code, 30d = 1Eh.

The PLC, after acquisition of the alarm/warning address 30d code, transmits the alarm code through the DATA lines.
If multiple alarms occur, the direct signal "MULTIPLE ALARMS" is in logic state1 and the ESO computer requires the transmission of the other alarms by sending again the alarm ADDRESS code until the "MULTIPLE ALARMS" signal is cleared by the PLC.
The multiple alarms/warnings codes transmission is made with a code related priority logic.

The highest priority alarms are those coded with the lowest codes (1, 2, 3, etc.).

The reset of a latched alarm is made in two different ways:

-	in local mode a RESET pushbutton located in the Local Control Panel clears the latched alarm only after the cause of the fault has been removed.
-	in remote mode under ESO computer control, a RESET logic signal is sent by the ESO computer to the PLC having the same function of the RESET pushbutton (direct signal RPAL).

The status signals related to the inputs to the PLC from the hydraulic unit (POU), from hydraulic support system (HSS), from temperature measuring system (TMS) and from the electrical cabinet (BSC) are stored in a table, organized in 16 bit words, inside the PLC memory.
The status words are listed in the group 3.
The ESO COMPUTER can address the transmission of each of these 16-bits status words (which represent the image of the PLC inputs), using the 8 address lines (starting from address 50).

The analog measurement signals from thermistors and reference signals for temperature and chilled water, listed in the group 5, are transmitted by the PLC in multiplexed-parallel form, addressed by the ESO COMPUTER.

The transmission protocol is described below:

The multiplexed-parallel transmission system consists of the following interface for alarm and status signals and measurement signals (see figure 4):

-	8 ADDRESS lines: lines0-6 for address binary code definition, to address up to 128 codes and line7 for ADDRESS PARITY bit (ODD PARUTY).

PLC inputs

E12.0 - E12.6 E12.7

ADDRESS ADDRESS PARITY

-	18 DATA lines: lines0-15 for binary data definition and lines16 and 17 for two DATA PARITY bits (LOW for 0 to 7 DATA bits and high for 8 to 15 DATA bits, ODD PARITY).

PLC outputs

A12.0 - A13.7 A14.0 A14.1

DATA DATA PARITY LOW DATA PARITY HIGH

-	ADDRESS STROBE line PLC input E 13.0

-	DATA STROBE line PLC output A 14.2

-	ADDRESS ACKNOWLEDGE line PLC output A 14.3

-	DATA ACKNOWLEDGE line PLC input E 13.1

-	ADDRESS PARITY ERROR line PLC output A 14.4

ESO computer handles the ADDRESS lines, while the SIMATIC PLC handles the DATA lines.

Both the ADDRESS and DATA information are strobed with an ADDRESS STROBE and DATA STROBE signals, which are cancelled by sending an ADDRESS ACKNOWLEDGE and a DATA ACKNOWLEDGE signal respectively.

In case PLC detects a parity error in the ADDRESS transmission from ESO computer, it sends back the ADDRESS ACKNOWLEDGE signal plus the ADDRESS PARITY ERROR signal, which is held in logic state1 since the moment of parity error detection.

After ESO computer detects the ADDRESS PARITY ERROR signal, it sends the ADDRESS code255, which means to put all the 8 ADDRESS lines at logic state1.

The following scenarios are defined:

a) If 1 or more ADDRESS lines are detected by the PLC at logic level 0 (which means the address code detected is different from 255), the PLC transmits the ADDRESS ACKNOWLEDGE signal maintaining the ADDRESS PARITY ERROR signal at logic level1.

The PLC retransmits the detected ADDRESS code, different from 255, to ESO computer through the DATA lines.
For sake of security the ADDRESS code will be sent both on the DATA byte LOW (0-7) and on the DATA byte HIGH (8-15), transmitting also the DATA PARITY bits.

Example:
if the PLC detects the ADDRESS code: BE = 1 0 1 1 1 1 1 0 (LSB)

it will send-back through the DATA lines the following code:

BE B E 11 = 10111110 - 10111110 - 1 - 1
data lines 0 7 8 15 16 17

This information will enable the ESO computer to detect the interrupted line(s).

The ADDRESS PARITY ERROR signal will be maintained at logic state1 until the correct ADDRESS transmission has been detected.

b) If no parity errors are detected (that means the PLC detects the ADDRESS 255), the PLC sends back the ADDRESS ACKNOWLEDGE signal and resets the ADDRESS PARITY ERROR signal.
In this case the ESO computer retransmits the last ADDRESS code, which originated the parity error alarm.

For the control of the DATA correct transmission from PLC, the ESO computer sends two dedicated ADDRESS codes to the PLC if any circumnstance is required (e.g. at every system start-up, after detection of a DATA PARITY ERROR, etc.).

These dedicated address codes, namely 119d = 77h, 120d = 78h, are recognized by the PLC as requests to send the following DATA:

119d = 0 0 0 0 - 0 - 0 (parity bits)
120d = F F F F - 1 - 1 (parity bits)

it will enable the ESO computer to check any error transmission or interruption in the DATA lines.

The proposed timing diagram of the ADDRESS and DATA information interchange is shown in figure4 (estimated length of the Strobe signals due to the PLC cycle time: approx. 50msec).

ESO computer forms and transmits ADDRESS code and ADDRESS STROBE signal in the same instant.
PLC detects the ADDRESS STROBE high and after a delay (tipically 5msec.), which eliminates the possible transients due to the optoinsulators and input stage, latched the ADDRESS code and sends the ADDRESS ACKNOWLEDGE signal, which is used by ESO computer to reset ADDRESS and STROBE lines.

On the other hand the PLC forms and transmits DATA and DATA STROBE signal in the same instant.
ESO Computer detects the DATA STROBE signal at logic state1 and after the same delay (tipically 5msec.) latches the DATA value and sends the DATA ACKNOWLEDGE signal, which is used by PLC to reset the DATA and STROBE lines.

Safety Interlock Signals

The following interlock contacts are provided by BSC to ESO COMPUTER cabinet:

-	no.1 Potter-like relay contact, normally closed when the relay coil is powered, which is opened when are manually activated:

Both relay contacts are open when the BSC main supply (380V, 50Hz 3-phase line) is open.

	GENERAL STOP (ARGE logic signal from PLC to ESO COMPUTER)
	EMERGENCY STOP (AREM logic signal from PLC to ESO COMPUTER).

The difference between these two shut-down commands is that, when the EMERGENCY STOP is commanded, after the execution of the shut-down procedure the main supply breaker is opened.
The relay contact is opened 2 seconds after the Emergency and General Stop push-buttons are pressed.

-	no.1 Potter-like relay contact, normally closed when the relay coil is powered, which is immediately opened when the power supply to the PLC CPU (220 Vac) and/or to the PLC interface (24 Vdc) fails. In this case no controlled shutdown procedure is possible to the BSC unit.

The two contacts (two wires for each contact) are available to the ESO COMPUTER interface cabinet: four pins are provided for this purpose in the external interface to ESO COMPUTER connector J9 located in the BSC unit.

INNSE suggests the following interlocks to be provided by ESO COMPUTER cabinet to BSC:

-	no.1 relay contact (Potter-like relay), normally closed when the relay is powered, which immediately opens when a GENERAL STOP command is activated in the ESO cabinet.

This contact, namely ESDIN contact described in the ESO TECHNICAL specification, is operative only in REMOTE mode of operation.

-	1 relay contact (Potter-like relay), normally closed when the relay is powered, which immediately opens when an EMERGENCY STOP command is activated in the ESO cabinet.

This contact is always active both in LOCAL and REMOTE mode of operation.

The contacts must be suitable to operate with a nominal operating voltage of 24 Vdc and a current of 1 Amp.

With this latter command, after the execution of the shut-down procedure in the BSC, the main supply breaker is opened.

The two contacts (two wires for each contact) are available to the BSC cabinet: four pins are provided in the external interface to ESO COMPUTER connector J9 located in the BSC unit.

DRAWING LIST

Send Comments to: Agustin Macchino Last update: October 12, 2001