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This document was originally released as SPEC-0112 Global Interlock System Architecture. |
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Preface
The Global Interlock System (GIS) Design represents a challenge in that its design is in parallel with (and in some cases before) the designs of the systems it is meant to safeguard. Without completed designs and hazard analyses, the safety functions that the GIS are to implement cannot be completely defined.
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· ICD 2.1-4.5 , Wave Front Control-Coudé Coude to Global Interlock System
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· ICD 3.1.2-4.5, Master Clock and Synchro Network to Global Interlock System
· ICD 3.1.3-4.5, Coudé Coude Station to Global Interlock System
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See SPEC-0012, ATST Acronym List and Glossary, for terms not listed below.
GIC | Global Interlock Controller |
LIC | Local Interlock Controller |
PAC | Programmable Automation Controller |
PLC | Programmable Logic Controller |
SIL | Safety Integrity Level |
SRCF | Safety-Related Control Function |
TÜV | Technischer Überwachungsverein (German) (English: Technical Inspection Association) An internationally accepted independent testing and certification organization. |
Global Interlock System
Overview
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Optical Support System (OSS)
Top End Optical Assembly (TEOA)
M1 Assembly
Feed Optics
Polarization Analysis and Calibration (PAC)
Mount Base
Telescope Mount Assembly
Coudé Coude Rotator
Coudé Coude Drive Controller
Coudé Coude Environmental Systems
Instrumentation
Wave Front Controller
Visible Broadband Imager
Visible Spectropolarimeter
Diffraction Limited Near-IR Spectropolarimeter
Cryogenic Near-IR Spectropolarimeter
Visible Tunable Filter
Camera System
Facility Thermal System
Facility Thermal Control System
Enclosure Motion
Enclosure Motion Control
Facilities
Facility Equipment
qty | catalog number | description | status |
|---|---|---|---|
2 | 1756-L63S | GuardLogix Controller 8 MB | discontinued |
2 | 1756-L62S | GuardLogix Controller 4 MB | discontinued |
4 | 1756-LSP | GuardLogix Safety Partner | discontinued |
1 | 1756-L72S | GuardLogix 5572S Automation Controller 4MB/2MB | active |
1 | 1756-L7SP | GuardLogix 5572S Safety Partner processor | active |
1 | 1756-L83ES | GuardLogix 5580, Safety Controller 10MB | active |
1 | 1756-L8SP | GuardLogix 5580, Safety Partner Controller | active |
Independent Safety Network
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Each VLAN will have a /24 subnet assigned from the private IPv4 address space. No device will be assigned to the default VLAN or the default address space 192.168.1.0/24 as a security measure.
Subsystem | VLAN | Addresses |
|---|---|---|
GIS | 10 | 10.4.1.0/24 |
OSS | 20 | 10.4.2.0/24 |
Mount Base | 30 | 10.4.3.0/24 |
Coude Floor | 40 | 10.4.4.0/24 |
Instrumentation | 50 | 10.4.5.0/24 |
Facility Thermal | 60 | 10.4.6.0/24 |
Enclosure Motion | 70 | 10.4.7.0/24 |
Facilities | 80 | 10.4.8.0/24 |
Compatibility within Global Interlock System
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Devices connected to the distributed I/O modules shall be suitable for use in a safety function.
Device | Requirement |
Emergency stop switches | Use approved devices with direct opening mechanisms complying with IEC/EN 60947-5-1. |
Door interlocking switches, limit switches | Use approved devices with direct opening mechanisms complying with IEC/EN 60947-5-1 and capable of switching microloads of 24V dc 5 mA. |
Safety sensors | Use approved devices complying with the relevant product standards, regulations, and rules in the country where used. |
Relays with forcibly guided contacts, contactors | Use approved devices with forcibly-guided contacts complying with EN 50205. For feedback purposes, use devices with contacts capable of switching micro loads of 24V dc 5 mA. |
Other devices | Evaluate whether devices used are appropriate to satisfy the requirements of safety category levels.- |
Distributed I/O modules
The actual distributed I/O modules are part of the subsystem rather than the GIS. The subsystem designers and builders are responsible for supply of the safety I/O modules and the connectivity of the Safety Limits and Safety Interlocks to said modules. Wiring of the Safety Limits and Safety Interlocks shall be performed according to the current version of the appropriate Rockwell Automation User Manual.
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