<html><body><div style="font-family: georgia,serif; font-size: 12pt; color: #000000"><div>Dear Dr. Rossi.</div><div><br data-mce-bogus="1"></div><div>FYI</div><div><br data-mce-bogus="1"></div><div>DSG has completed with task #2 "PLC-Test Ethernet vs Controlnet interface" as part of the Hall C PLC task list.</div><div><br data-mce-bogus="1"></div><div>The final goal of this task #2 is swapping of faulted Controlnet modules in the SHMS PLC control systems by Ethernet module, since according to Hall C log entries there was several occasion where these Controlnet modules loss communication and affected cryogenics in Hall C and other Halls that uses the same helium supply (ESR). The suspicion is that the radiation could be the affecting these modules.</div><div><br data-mce-bogus="1"></div><div>Test was completed in the Standalone PLC test station at the TED building; results showed that performance of the CPU/Memory PLC controller was not affected and mixed networks (Controlnet and Ethernet) can run in parallel with no problems.</div><div><br data-mce-bogus="1"></div><div>Now the next step will be the implementation and test in the SHMS PLC control system; the implementation, based in the discussion with Steve, will include the swapping of two Controlnet modules by two Ethernet modules in the "Q1" and "HX" SHMS PLC chassis. for the implementation and test in the actual SHMS PLC, DSG is waiting for approval/information of Mike/Steve. </div><div><br data-mce-bogus="1"></div><div>Best Regards,</div><div>Pablo </div></div></body></html>