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<== Date ==> <== Thread ==>
Subject: Re: EPICS for personal safety system
From: "Dudley, David" <[email protected]>
To: "[email protected]" <[email protected]>
Date: Sun, 24 Mar 2013 14:43:52 +0000
Should also add to this, some extra information.

There are discrete signals between all the PPS systems, as well as some additional discrete inputs on each available that will cause the beam to be disabled or dumped, depending on where the signal comes in.

The LINAC can be commanded to disable the EGUN, or kill AC power to it, the Booster can be commanded to dump the booster, kill the AC to the RF, or reach back to the LINAC and prevent injection, the Storage ring has those capabilities, as well as being able to dump the storage ring.

There are also some discrete outputs available from each subsystem that allow other systems to get direct status or confirmation that an event has been recognized, and a response is being performed.  

For instance, should the LINAC disable the EGun, it notifies the Booster (and others) that there will be no beam supplied, which can be used to cancel, or limit injection into the Storage Ring.  
More to the point, if the EGun has been disabled for some reason (radiation alarms, operator intervention, power problem, hardware error, etc…), the current plan is that the Booster will dump it's current charge, and shutdown, awaiting a restart.  That way, a partial injection that might cause problems with the stored beam won't be injected.
Essentially, each subsystem in the chain (LINAC, Booster, Storage Ring) is aware of the status of the other subsystems, and provide capabilities to take action on that status, if required, and notify others of that status, if needed.


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In the case of BNL's NSLS-II, in order to meet the safety requirements, EPICS and the PLC's in the PPS (Personnel Protection System) have no direct access between them.  

There is an intermediate PLC with 2 network interfaces that EPICS has complete access to, and the PPS PLC's have write access to.
 
 Nothing can directly access the PLC's in the PPS system, and it writes status information into, and reads commands from the interface PLC.

That prevents EPICS from sending a command that might compromise the PPS, as well as access from anything else on the controls network causing the PPS PLC's to be compromised.

Later-

David



On Mar 24, 2013, at 5:20 AM, Morteza Mansouri <[email protected]> wrote:

Subject:
From:
To:
EPICS for personal safety system
 
Hello everyone,
 
We are planning to build a monitoring system for our PSS (personal safety system) in SESAME based on EPICS.
I am looking for some advice if it is recommended that the IOC has writing permission to PSS PLCs or it should be the case of the IOC only reading from PSS PLC.
 
Many thanks for your help in advance.
 
Morteza Mansouri
PSS (Personal Safety System) Engineer
SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East)
P.O. Box 7, Allan 19252, Jordan
 

References:
EPICS for personal safety system Morteza Mansouri
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