Chapter 7 - Hydrostatic Bearing


The Hydrostatic Bearing VME system provides interfacing to the following subsystems:

7.1.1 Reference Information

The following sections refer to specific information:

7.1.2 Hydrostatic Bearing Control

The Hydrostatic Bearing control comprises a local PLC controller, provided by the company INNSE. A VME system, provided by ESO, controls this PLC. This chapter describes only the interface signals between the ESO computer and the PLC. For detailed information on the PLC, refer to the INNSE documentation listed in Subsection 7.4.3.

Interlock for Azimuth Motion

The azimuth motion is interlocked if the oil pressure behind the valve is too low.

7.1.3 Emergency Stops

Emergency stop buttons in the building are routed to the Hydrostatic Bearing VME rack. Here, each button generates a computer signal.

7.1.4 Signal Conventions

The signals to and from the Hydrostatic Bearing controller are connected to the VME computer via opto-couplers. This is done to interface from 24V logic to 5V logic and to provide galvanic separation.

The signals from the Hydrostatic Bearing side are 24V true in most cases. The opto-couplers invert the signals; therefore the VME I/O signals are 0V true in most cases. The signals are described in the true state (as normal). The false state is indicated, in the cases where it is not ovbious, with an "f".

In all cases, the description in the documents is defined such that:


The signals in the Hydrostatic Bearing subsystem are divided into the following groups that indicate where the signals originate (inputs to the computer), or where they have to be routed (outputs from the computer).

Refer to the INNSE documents for a detailed description of the multiplexed bus; in this chapter, only the hardware signal names are described. The signal abbreviation is the same as used by INNSE, this means that it is not similar to, for example, the Altitude system. In order to integrate the INNSE abbreviation system in the NTT signal system, all Hydrostatic Bearing signals have the prefix HB.

7.2.1 Emergency Stop Buttons

The emergency stop buttons in the building basement are series connected in the HB VME cabinet, and routed from there via two slipring contacts to the building VME cabinet. Each button also generates a computer signal.

7.2.2 Parallel Signals Transmitted by the ESO Computer

AUMHSZO* DO*1 Selection of auto mode of operation (f=manual)
NRDUSZO* DO*1 Selection of normal mode (f=degraded)
STARTAUO* DO*1 Start automatic sequence, impulsive signal
STOPAUO* DO*1 Stop automatic sequence, impulsive signal
STWARMUPO* DO*1 Start warm-up sequence, impulsive signal
COMRESO* DO*1 Command reset, impulsive signal (oil 'STOP' command)
ALRESO* DO*1 Alarms reset, impulsive signal
EMSTOPO DO*1 Emergency stop from ESO (Local/Main)
GESTOPO DO*1 General stop from ESO
ASMOO* DO*1 Telescope in motion

Note: Impulsive signals must be at least 500 msec in length.

7.2.3 Parallel Signals Transmitted by PLC

SZMHI* DI*1 Manual mode selected
SZTPI* DI*1 Test mode selected
SZAUI* DI*1 Automatic mode selected
SZOPRTI* DI*1 Remote mode selected (f=local)
SZOPNRI* DI*1 Normal environment selected (f=degraded) (1=REM , 0=LOCAL)
MAAUI* DI*1 Automatic sequence activated
MAWBOLI* DI*1 Oil warm-up activated
SZVVRN1I* DI*1 Chilled water regulator valve 1 selected
SZVVRN2I* DI*1 Chilled water regulator valve 2 selected
SZEVPWOLI* DI*1 Oil feed command to bearing
MAMPRC1I* DI*1 Oil filtering pump 1 activated
MAMPRC2I* DI*1 Oil filtering pump 2 activated
MAMPPW1I* DI*1 Oil feed pump 1 activated
MAMPPW2I* DI*1 Oil feed pump 2 activated
WBOLOKI* DI*1 Oil adjustment in tolerance
ALISI* DI*1 Immediate alarm (f=normal operation)
ALRII* DI*1 Delayed alarm/ warning (f= normal operation)
ALMXI* DI*1 Multiple alarms/ warnings
AREMI DI*1 Emergency stop (f=normal operation)
ARGEI DI*1 General stop (f=normal operation)
ARISI DI*1 Emergency stop request (f=normal operation)

7.2.4 Multiplexed Bus Signals

ADDRxO* DO*7 Address bus, x=6 (MSB) through 0 (see Note 1)
ADDPARO* DO*1 Address bus parity
ADDSTRO* DO*1 Address strobe
ADDACKI* DI*1 Address acknowledge
ADDPARERI* DI*1 Address parity error
DATAxxI* DI*16 Data bus, xx=15 (MSB) through 00 (see Note 2)
DATAPARLI* DI*1 Data bus parity, low byte
DATAPARHI* DI*1 Data bus parity, high byte
DATASTRI* DI*1 Data strobe
DATAACKO* DO*1 Data acknowledge

Note 1: Software assignment for the address bus is HBADDRESS*,this accesses the whole port (8 bits, of which 6 are used).

Note 2: Software assignment for the data bus is HBDATAHBYTE* and HBDATALBYTE* for the high and low bytes respectively. This accesses one port (8 bits) each.

7.2.5 Emergency Stop Signals

ESBUBA01I* DI*1 Emergency stop button in building basement, 1
ESBUBA02I* DI*1 Emergency stop button in building basement, 2
ESBUBA03I* DI*1 Emergency stop button in building basement, 3
ESBUBA04I* DI*1 Emergency stop button in building basement, 4


This signal schedule describes the location of the VME computer signals of the Hydrostatic Bearing. The signals are explained in Section 7.2.

This section provides the information to track each signal from the software driver to the input or output of the VME board. The VME system for the Hydrostatic Bearing contains two digital I/O interface boards.

The signals are connected via flat cable to the Weidmueller multi-termination strips (MTS1 through MTS4). From here, two special cables run to the INNSE opto-coupler box connectors J2 and J4,

The assignment of the signals is such that MTS1 is connected with J4 only; MTS2 and MTS3 are connected with J2 only; MTS4 is spare. From J4, some signals are connected to TS1 (power, emergency). The weather data enters via the RS232 port.

7.3.1 Multiplexed Bus and Parallel Output.- (DIG I/O 1, SLOT 9, ROW A)

ADD0O* /acro0 0 1 MTS1-15 B32 LOW J4-A address code lsb
ADD1O* /acro0 1 1 MTS1-13 B31 LOW J4-B address code
ADD2O* /acro0 2 1 MTS1-11 B30 LOW J4-C address code
ADD3O* /acro0 3 1 MTS1-9 B29 LOW J4-D address code
ADD4O* /acro0 4 1 MTS1-7 B28 LOW J4-E address code
ADD5O* /acro0 5 1 MTS1-5 B27 LOW J4-F address code
ADD6O* /acro0 6 1 MTS1-3 B26 LOW J4-H address code msb
ADDPARO* /acro0 7 1 MTS1-1 B25 LOW J4-J address bus parity bit
ADDSTRO* /acro0 8 1 MTS1-31 B24 LOW J4-K address strobe
DATAACKO* /acro0 9 1 MTS1-29 B23 LOW J4-L data acknowledge
AUMHSZO* /acro0 10 1 MTS1-27 B22 LOW J4-M selection of automatic/ manual
NRDUSZO* /acro0 11 1 MTS1-25 B21 LOW J4-N selection of normal/ degraded
STARTAUO* /acro0 12 1 MTS1-23 B20 LOW J4-P start automatic sequence (pulse)
STOPAUO* /acro0 13 1 MTS1-21 B19 LOW J4-R stop automatic sequence (pulse)
STWARMUPO* /acro0 14 1 MTS1-19 B18 LOW J4-S Start warm-up sequence (pulse)
COMRESO* /acro0 15 1 MTS1-17 B17 LOW J4-T command reset (pulse)
ALRESO* /acro0 16 1 MTS1-47 A32 LOW J4-U alarm reset (pulse)
EMSTOPO* /acro0 17 1 MTS1-45 A31 HIGH J4-V emergency stop from LCU
GESTOPO* /acro0 18 1 MTS1-43 A30 HIGH J4-W general stop from LCU
ASMOO* /acro0 19 1 MTS1-41 A29 LOW J4-X telescope in motion (not used)

7.3.2 Multiplexed Bus Input.- (DIG I/O 1, SLOT 9, ROW C)

HBDATAI* /acro03 2 1 MTS2-16 C32LOW J2-K data bus lsb
HBDATAI* /acro03 3 1 MTS2-14 C31 LOW J2-L data bus
HBDATAI* /acro03 4 1 MTS2-12 C30 LOW J2-M data bus
HBDATAI* /acro03 5 1 MTS2-10 C29 LOW J2-N data bus
HBDATAI* /acro03 6 1 MTS2-8 C28 LOW J2-P data bus
HBDATAI* /acro03 7 1 MTS2-6 C27 LOW J2-R data bus
HBDATAI* /acro03 8 1 MTS2-4 C26 LOW J2-S data bus
HBDATAI* /acro03 9 1 MTS2-2 C25 LOW J2-T data bus
HBDATAI* /acro04 0 1 MTS2-32 C24 LOW J2-A data bus
HBDATAI* /acro04 1 1 MTS2-30 C23 LOW J2-B data bus
HBDATAI* /acro04 2 1 MTS2-28 C22 LOW J2-C data bus
HBDATAI* /acro04 3 1 MTS2-26 C21 LOW J2-D data bus
HBDATAI* /acro04 4 1 MTS2-24 C20 LOW J2-E data bus
HBDATAI* /acro04 5 1 MTS2-22 C19 LOW J2-F data bus
HBDATAI* /acro04 6 1 MTS2-20 C18 LOW J2-H data bus
HBDATAI* /acro04 7 1 MTS2-18 C17 LOW J2-J data bus msb
HBDATAPARLI* /acro04 8 1 MTS2-48 A1 LOW J2-U data bus parity low byte
HBDATAPARHI* /acro04 9 1 MTS2-46 A2 LOW J2-V data bus parity high byte
HBDATASTRI* /acro05 0 1 MTS2-44 A3 LOW J2-W data strobe
HBADDACKI* /acro05 1 1 MTS2-42 A4 LOW J2-X address acknowledge
HBADDPAPERI* /acro05 2 1 MTS2-40 A5 LOW J2 -Yaddress bus parity

7.3.3 Parallel Input.- (DIG I/O 2, SLOT 8, ROW A)

HBSZMHI* /acro1 0 1 MTS3-15 B32 LOW J2-Z !manual mode selected
HBSZTPI* /acro1 1 1 MTS3-13 B31 LOW J2-a test mode selected
HBSZAUI* /acro1 2 1 MTS3-11 B30 LOW J2-b automatic mode selected
HBSZOPRTI* /acro1 3 1 MTS3-9 B29 LOW J2-c remote mode selected
HBSZOPNRI* /acro1 4 1 MTS3-7 B28 LOW J2-d normal environment selected
HBMAAUI* /acro1 5 1 MTS3-5 B27 LOW J2-e automatic sequence activated
HBMAWBOLI* /acro1 6 1 MTS3-3 B26 LOW J2-f oil warm-up activated
HBSZVVRN1I* /acro1 7 1 MTS3-1 B25 LOW J2-h chilled water regulator valve 1 selected
HBSZVVRN2I* /acro1 8 1 MTS3-31 B24 LOW J2-j chilled water regulator valve 2 selected
HBSZEVPWOLI* /acro1 9 1 MTS3-29 B23 LOW J2-k oil feed command to bearing
HBMAMPRC1I* /acro1 10 1 MTS3-27 B22 LOW J2-m oil filtering pump 1 activated
HBMAMPRC2I* /acro1 11 1 MTS3-25 B21 LOW J2-n oil filtering pump 2 activated
HBMAMPPW1I* /acro1 12 1 MTS3-23 B20 LOW J2-p oil feed pump 1 activated
HBMAMPPW2I /acro1 13 1 MTS3-21 B19 LOW J2-r oil feed pump 2 activated
HBWBOLOKI* /acro1 15 1 MTS3-17 B17 LOW J2-t oil adjustment in tolerance
HBALISI* /acro1 16 1 MTS3-47 A32 LOW J2-u immediate alarm
HBALRII* /acro1 17 1 MTS3-45 A31 LOW J2-v delayed alarm/warning
HBALMXI* /acro1 18 1 MTS3-43 A30 LOW J2-w multiple alarms/warnings
HBAREMI* /acro1 19 1 MTS3-41 A29 HIGH J2-x emergency stop
HBARGEI* /acro1 20 1 MTS3-39 A28 HIGH J2-y general stop
HBARISI* /acro1 21 1 MTS3-37 A27 HIGH J2-z emergency stop request

7.3.4 Emergency Stop and Spare.- (DIG I/O 2, SLOT 9, ROW C)

HBSPARE5O* /acro1 32 1 MTS4-16 C16 LOW INSEremote mode enable(RL5) via TS3-1 and TS3-2 to INSE rack
HBESBUBA04I* /acro1 44 1 MTS4-24 C20 LOW emergency stop button building 4(RL4)
HBESBUBA03I* /acro1 45 1 MTS4-22 C19 LOW emergency stop button building 3(RL3)
HBESBUBA02I* /acro1 46 1 MTS4-20 C18 LOW emergency stop button building 2(RL2)
HBESBUBA01I* /acro1 47 1 MTS4-18 C17 LOW emergency stop button building 1(RL1)

7.3.5 Emergency Signals

Emergency Stop from ESO TS1-3 yel/gry jumpered to TS1-4
(relay contact) TS1-4 gry/grn jumpered to TS1-3
General Stop from ESO TS1-1 brn/blk jumpered to TS1-2
(relay contact) TS1-2 wht/blk jumpered to TS1-1Stop to ESOTS1-5.not used
(contact opening) TS1-6 .not used Interlock to AZ
(pressure low) TS1-7 brn AZ interlock via slipring 22
(contact opening) TS1-8 wht AZ interlock return via slipring 32
Emergency Stop Interlock TS1-9 brn ?to BUEmergency Stop ReturnTS1-10wht?to BU

7.3.6 Miscellaneous Signals

Some interconnections on the INNSE opto-coupler box connectors are required to provide the INNSE signal; CKSICC (connector safety).

These connections are not related to any VME signal.

The VME 5V supply is used for the INNSE opto-couplers.

The VME+ and -12V power is used for interfacing the weather data.

Connector Safety



This section refers to the maintenance information for the NTT Hydrostatic Bearing VME System; references to drawings, data sheets and other information are included.

Interfacing of weather data (RS232 link) and the VME supply (+12V and -12V)is via TS2.

7.4.1 Drawing List

HB Interface Schematic Diagram . . 126-10-88CS-E-1602
Emergency Stops in Building Basement . . 07-05-90HYBEAR.SCH

7.4.2 Data Sheets

DESCRIPTIONNO. OF SHEETSBurr-Brown Opto-transceiver LDM803INNSE Bearing System Controller.

7.4.3 PLC Documentation

Separate documentation from: