LIGO Document E1200368-x0

aLIGO, Slow Controls, Chassis, Corner Remote Access H1

Document #:
LIGO-E1200368-x0
Document type:
E - Engineering documents
Abstract:
The remote access controls chassis connects the corner with the end stations by extending the corner EtherCAT network. This allows safety terminals to span multiple buildings. It also allows for direct data exchange and timing synchronization between the corner and end station EtherCAT networks. This chassis is located in the MSR. The following features are implemented:

- 1 memory terminal for persistent computer-independent storage
- 1 safety PLC to support a global laser safety interlock
- 4 safety input switches and 4 safety output relays
- 2 EtherCAT junctions supporting single-mode fiber runs to the end stations
- 1 EtherCAT junction supporting the multi-mode fiber run to the electronics room
- 1 PTP terminal to support global timing synchronization through IEEE 1588
- 1 EtherCAT bridge to the H2 slow controls network in the corner
- Multiple serial ports to read the timing master, GPS clocks, weather stations, etc.

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