ECR Title: ECR: End Station EtherCAT Chassis Modification for TCS	DCC No: E1200930-v2
Date: 04-June-2013
Requester: Aidan Brooks, Daniel Sigg	Impacted Subsystem(s): AOS/TCS, CDS
Description of Proposed Change(s): Modify End Station EtherCAT chassis (D1100682).
Reason for Change(s): To allow control of Ring Heater Drivers and Hartmann Sensors, though eliminating channels for once-proposed temperature sensing of the Hartmann Sensor.
Estimated Cost: $5360.40 for EtherCAT terminals (6x EL2124, 12x EL3104, 6x EL4134, 6x EL9190), serving all three IFOs and $200 for 6+1 spare adapter cables (9pin Dsub to 15 pin Dsub) addressing the HWS channels
Schedule Impact Estimate: Labor associated with adding cables to the TCS installation at each end station (minimal)
Nature of Change (check all that apply): Safety Correct Hardware Correct Documentation	Improve Hardware Improve/clarify Documentation Change Interface Change Requirement
Importance: Desirable for ease of use, maintenance, safety Desirable for improved performance, reliability Essential for performance, reliability Essential for function Essential for safety	Urgency: no urgency desirable by date/event: ____________ Essential by date/event: ____________ Immediately (ASAP)
Impacted Hardware (select all that apply): Repair/modify. List part & SNs: _S1107438-S1107440__ Scrap & Replace. List part & SNs:_____________________ Installed units? List IFO, part & SNs: _________________ Future units to be built	Impacted Documentation (list all dwgs, design reports, test reports, specifications, etc.): D1100682: EtherCAT End Station Chassis 2 E1200376: aLIGO, Slow Controls, Chassis, End 2 E1101029: End Station Controls Chassis 2 Wiring Diagram E1100891: TCS Block Diagram: End Stations
Disposition (to be completed by Systems Engineering): TRB CCB Approved Additional information required. Define: [Requester re-submits with new information with the same DCC E-number for the ECR but the next version number.] Concurrence by Project Management: (Acknowledged Electronically in DCC) Project Systems Engineer: Dennis Coyne Project Systems Scientist: Peter Fritschel