FROM: 	Bobby McKee,		Mech Engr
		x 2835,			M/S 12

SUBJECT:	8-PACK Phase I Control System Review


We held a working session on the 8-PACK Phase I control system on Tuesday, July 9 at 2:30 pm in the NLCTA conference room.  (See attached material.)  The objective of this meeting was to both establish goals for the 8-PACK “remote” control system effort and to kick-off tasks to achieve these goals.  The current schedule shows the 8-PACK system commissioning to begin August 22, 2002.

The following are the meeting minutes (thanks to J. Nelson and R. Chestnut):

Modulator

1.	R. Cassel will provide a list of all signals in the PLCs next week (week of July 15 ) to J. Nelson.    
For digital devices the list includes; location, description, bit-word-table, meaning of zero/one, fault states.
2.	For analog devices the list includes; location, description, word and table, number of bits, signed or unsigned, conversion slope offset, associated engineering units, warning, alarm, and trip limits.
3.	Per  R. Fuller either Alan Hill or Serge Ratkovsky will program the PLCs. Needs planning. 
4.	J. Nelson, J. Rock, and S. Allison  will set up databases and displays.
5.	All EPICS Allen-Bradley will be read-only.
6.	Control (On/Off, Reset, etc.) will be digital output, either EPICS DIO or SLC IDOM. 
7.	The HVPS reset and on/off will be handled through a VME DIO, extra channels through Steve Smith's DIO. 
8.	Modulator voltage will not be set remotely (neither CAMAC nor EPICS).  
9.	R. Cassel and A. Hill will need to help commission the PLC<->EPICS end-to-end.
10.	EPICS monitoring checkout can occur during R. Cassel’s initial stand-alone testing.
11.	The EPICS monitoring and Digital Control (see (5)) are needed near Aug. 22.
12.	J. Nelson will get the crate profiles for both CAMAC and VME to verify database lists.

Vacuum

1.	Modulator controls PLC logic gets a single status bit for each vacuum pump T. Porter.
2.	Modulator controls PLC logic sets one "OR" to indicate a vacuum failure.
3.	The SLC system gets both Analog and Digital (Bad vacuum) info for all vacuum.
4.	N. Spencer and K. Jobe will name the SCP database entries after the Kaiser pumps and alias them with the pump unit numbers (8010, etc).  This will probably not happen until the next DB Install (mid-August).  As with the NLCTA, the vacuum information gets to EPICS via the SLC system.
5.	The EPICS system has software warning and error trip levels for vacuum, like in the NLCTA.
6.	K. Jobe/operations specified the need for glitch trapping and software limits on the vacuum pumps in EPICS, like the existing system in NLCTA.
	
Interlocks

1.	The plan for the interlocks is not clear.  Who is responsible and committed to its design/implementation/decision (M. Ross, K. Jobe, C. Adolphsen) ? 

EPICS Fast Control

1.	This is much like the NLCTA, and is needed end-of-September-ish, after S. Smith and his crew are happy with the LLRF.

Slow LLRF Control

1.	This requires DAC and ADC EPICs channels soon.
2.	The DAC driver is now under test.
3.	The Fast SIS Digitizer is now ready.
4.	The ADC front-ends are still uncertain. 
5.	S. Smith says Peak-power alone as input to the ADCs is fine.
6.	The ADCs are the next module to be tested.
7.	S. Smith will provide S. Allison with crate, module, and channel information for the VME crate signals.  (Time scale not specified).
8.	It was agreed that K. Jobe and J. Nelson will make a list for S. Smith of all the readback/control necessary to run the current setup remotely by the end of the week.  One item on this list will be peak power meters that a labview program will read out and put into EPICS.

Operational Impact

1.	NLCTA and 8-Pack will share a control room and operators. There is no dedicated 8-PACK operations person.
2.	We will need SLED feedbacks in January.  This requires some hardware and some software.
3.	Also, for EPICs, it was decided that we will need the ramp up software and the fault counting ability that we currently have for NLCTA and the archive browser with archived variables.
4.	We will need more CUDs and more workstations in the NLCTA (action item for Keith and Marc Ross, et. al.)

J Nelson is planning weekly working sessions beginning next week.  I will schedule another group working session to take place about 3 weeks from the date of this memo. Thank you for your cooperation.  If you have any questions please contact either J. Nelson at 2162 or me at 2835.  




	Bobby McKee
	Systems Engineering