1. DOE Review 11 May 2005 Stephen A. Lewis
Vacuum Standards
DOE Review 11 May Stephen A. Lewis

2. Gauges, valves, and controllers connect to PLC with analog wires
Basic Approach
Gauges, valves, and controllers connect to PLC with analog wires
PLC provides high-integrity single-sector and inter-sector control
Technicians use portable console, controller panels, and optional valve panel for local operations
PLCs connect to IOCs with Ethernet/IP
Cat-5 wiring is physical star but logical bus
“Smart” controllers use serial to IOCs for auxiliary functions

3. PLC is distributed Basic Approach
Processor and some I/O in main chassis
Additional I/O in adapter/scanner cluster
All connect using Ethernet/IP—same Cat-5 wiring plant

4. Canonical ArchitectureV P G G C C O
<=Hardware-to-PLC: analog
I/O
PLC
<=PLC-to-IOC & PLC-to-PLC: Ethernet/IP
Controller-to-IOC: Serial=>
IOC
<=IOC-to-OPI: Ethernet/CA

5. Choices for PLC family Allen-Bradley ControlLogix
More expensive
Needs cross-connects
More options (like serial)
Takes rack space
Driver exists (SNS)
Allen-Bradley FlexLogic
Cheaper
Direct to “screw terminals”
No serial
Probably needs driver upgrade
Can install in cabinets (DIN-rail)
Can be mixed
CLX for comm; FLX for I/O

6. LCLS Global Standards…
Choice for Gauges
MKS-937A w/317-CEP and 422-CCG
15 msec response option now (SNS)
8 msec will be persued if warranted
A few hot-filament ion gauges will be required
Choices for Ion Pumps (in progress)
Gamma Digitel-MPC
SAFEConn connector and cables safety engineered
2 500mA; 2 outputs each
Full functionality; serial comm
Kaiser IPS-300 (current SLAC usage)
StarCell connector and cables more administration-centric
4 50mA; 2 outputs each