1. Still to decide for the LCLS PPS:
It is still unknown how the PLC is going to talk to the EPICS system
for passing status info. The ethernet box that can talk to the PLC 
unfortunately has the ability to write to the PLC and turn everything
on at startup and this could be dangerous. 

Ways around this: In order to use this box, we could add a second PLC
which interacts with the ethernet box but which "screens" what the 
controlling PLC gets. Essentially the 2nd PLC would just block traffic
to the 1st PLC. 

2. Defining the treaty point(s) between the PPS PLC system and the LCLS
controls system

The treaty point is either the backplane of the crate OR the TCP/IP delivery
point.

3. Allowing access to sectors 2 thru 16 when back beam stopper is in place

PKr: The PPS Physics requirements document suggest this should be done,
although it is not an absolute requirement for LCLS operation. The
justification is that it would allow fewer interruptions to LCLS
operation when PEP II maintenance work was required in the linac
tunnel. The engineering specification document should address what
additional costs, if any, are associated with the implementation of
this feature. LCLS management will then have the final say whether the
additional cost is warranted.


4. Full PPS access point in at sector 24 (by changing manway access into this)

PKr: The PPS Physics requirements document also suggests this should be done to
allow more time-efficient controlled access to the linac tunnel, instead of the
present permitted-access mode at present. Since the physics document was
written there is a strong indication that laboratory safety policy will require
a stairway access to the LCLS linac tunnel in place of the present ladders. In
anticipation of this safety policy we should plan on a full PPS access point at
S24.

Action Items:

1. (Patrick Bong et al) Define communications protocol between PLC & 
   LCLS control system

2. (Patrick Bong) needs to get a list of magnet hazards

3. (Patrick Bong) needs to know why RF stations are interlocked because 
   they feed RF into the injector