ECR Title: ECR: EtherCAT chassis End 2 changed	DCC No: E1200942-v1
Date: 10/19/2012
Requester: Daniel Sigg	Impacted Subsystem(s): ISC
Description of Proposed Change(s): Version 2 includes the following changes: - Remove legacy photodiodes (consequence of ECR E1200935) - Remove ASC demodulator concentrator (consequence of ECR E1200935) - Add up to 4 DC photodiode readbacks (required by ECR E1200938) - Change shutter interface to 24V logic (fix incorrect interface) - Remove flippers and temperature readbacks (required by ECR E1200930) - Add HWS controls and TCS ring heater controls (required by ECR E1200930)
Reason for Change(s): As part of the OAT close out several changes were made to the hardware that require an update of the slow controls interface.
Estimated Cost: None. Only 2 chassis were initially produced to support the OAT. The changes are mostly cost neutral and the allocated money will be sufficient.
Schedule Impact Estimate: None.
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: _Feb 2013____ Essential by date/event: ____________ Immediately (ASAP)
Impacted Hardware (select all that apply): Repair/modify. List part & SNs: ______________________ 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 D1100683, D1101977, E1101029, D1100670
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