Difference between revisions of "Controls To Do List"

Revision as of 17:10, 3 June 2011

Should we use ControlNet as well as Ethernet/IP in the hall?
- Notes
  - Is there really a network reliability problem?
  - Would we have to run a copper line to the counting house?
  - Should we use an additional PLC in the hall?
  - Should we locate the main PLC in the hall?
  - How much reliability do we need? What are the consequences of occasional network loss?
  - What are the mechanisms that cause loss of network connections?
- Resolution
  - Bryan and Brent say the high-class switches we will use in the hall are extremely reliable, as reliable as the PLC itself, so there doesn't seem to be a good reason to use ControlNet.
- Still To Do
  - Test what happens if an Ethernet cable is unplugged.

When should we use a PC104 vs an IOC on a PC vs direct PLC control?
- Notes
  - Should the FDC gas system use just PLC control and not use a PC104?
  - The FCAL CAN system probably requires an EPICS buffered virtual device running in a PC104.
  - Should we mix EPICS and PLC control in a single system?
- Resolution
- Still To Do
  - Need to see full FDC/CDC gas system P&I diagram.

@@ Line 5: / Line 5: @@
 *** Should we use an additional PLC in the hall?
 *** Should we locate the main PLC in the hall?
+*** How much reliability do we need?  What are the consequences of occasional network loss?
+*** What are the mechanisms that cause loss of network connections?
 ** '''''Resolution'''''
 *** Bryan and Brent say the high-class switches we will use in the hall are extremely reliable, as reliable as the PLC itself, so there doesn't seem to be a good reason to use ControlNet.