PAS Connect Interface

Requested by:

LSST

Code / Version:

7186_GIS_0010 / 1.0

Editor:

F. Javier López

Approved by:

Ismael Ruiz de Argandoña

Date:

02/09/2022

Document history

VERSION DATE EDITOR COMMENTS
1.0 2022/09/02 F. Javier López

Initial release
Acronyms Definition

AFE / AcFiEa

ETPB

Access Fire Earthquake

Emergency trip pushbutton
GIS Global Interlock System
HMI Human Machine Interface

IS

LAS

Interlock System

LASER

LSST

UI

Large Synoptic Survey Telescope

User Interface

Introduction

This document contains the signals communicated between the different CPUs that make up the telescope’s safety system.

@startuml skinparam componentStyle rectangle component GIS component M1M3 component DOME component TMA component AUX GIS <-d-> M1M3 GIS <-d-> DOME GIS <-d-> TMA GIS <-d-> AUX @enduml

The safety CPUs in the telescope are:

  • GIS, central controller

  • TMA-IS

  • M1M3-IS

  • DOME_IS

  • AUX-IS

This interface has been made based on the I/O map defined in the GIS Table_v_4.xlsx, included in 092-308-E-Z_0004 document.

GIS Table

Reference document list

No. DOCUMENT CODE VERSION
1

GLOBAL INTERLOCK SYSTEM (GIS) ANALYSIS

 092-308-E-Z-00004 04
2

GIS Table_v_4_xlsx

 092-308-E-Z-00004 04
3

Electric schemes – 7186 Test System for GISS_LSST Cabinets

 7186_GIS_0003 1.0
4

Electric schemes - 7186 LSST Global Safety Interlock System Design

 7186_GIS_0001 1.0
5

PASconnect Integration

 7186_GIS_0006 2.0

Communication GIS-Subsystems controller

The communication structure is vertical, it is only possible to link each CPU with the main controller and horizontal communication between the subsystem controllers is not contemplated.

ICD GIS-TMA

Inputs to GIS

  • GIS_D_7 TMA brakes NOT engaged

  • GIS_D_8 Camera cable wrap safety device activated

  • GIS_D_9 TMA ETPBs

  • GIS_D_17 Failed MCS watchdog or MCS loss communication

Output from GIS:

  • GIS_A_3 TMA Discharge Capacitors bank

  • GIS_A_4 TMA Disable other equipment

  • GIS_A_5 TMA main drives, STO and engage the brakes

  • GIS_A_6 Camera cable wrap drives STO

ICD GIS-M1M3

Inputs to GIS

  • GIS_D_18 M1M3 Interlock

Output from GIS:

  • GIS_A_18 M1M3 drives STO with Earthquake signal

  • GIS_A_19 M1M3 drives STO with Emergency stop

ICS GIS-DOME

Inputs to GIS

  • GIS_D_10 Dome Locking Pin retracted or Dome Rear Door Louvers NOT closed

  • GIS_D_11 Dome Rear doors are NOT closed

  • GIS_D_12 Dome ETPBs

  • GIS_D_13 Dome Crane not parkerd

Output from GIS:

  • GIS_A_7 Dome shutter and Windscreen drives STO or Disable

  • GIS_A_8 Dome crane drives STO or Disable

  • GIS_A_9 Dome Louvers and Dome Locking pin drives STO or Disable

  • GIS_A_10 Dome Rear Doors drives STO or Disable

  • GIS_A_11 Dome Azimuth drives STO or Disable

ICS GIS-AUX-TEL

In principle, the auxiliary telescope only needs to know the earthquake signal, so as not to duplicate the detector. This signal can be wired directly via a safe digital output of the GIS and in that case a SafetyNet communication with the GIS is not necessary. The other alternative is to establish the SafetyNet connection and define a communicated variable. In this case the ICD could be defined as,

Output from GIS:

  • GIS_A_22 Auxiliar telescope general STO