Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Thu, 6 Mar 2014 15:13:58 +0100

Hi Ganesh

On Thursday, March 06, 2014 18:53:22 Ganesh Jangir wrote:
> Sequencer in one IOC, is not able to monitor, PV from another IOC on
> the same network. However these PVs are accessible by caget and
> camonitor on both machines.
>
>
> ____Here is what I am
> doing.____________________________________________________
>
> Machine 1, IOC1.
>
> DB_1.db has
>
> record(waveform, "CMD_FIELD")
> {    field(DESC, "command")
>     field(NELM, 16000)
>     field(FTVL, CHAR)
>  }
>
> SEQ1.stt
> Updated above PV successfully.
> -----------------------------------------------------------
>
>
> Machine 2 IOC2
>
> SEQ2.stt has
>
> char CMD_[16000];
> assign CMD to "CMD_FIELD";
> monitor CMD;
> evflag cmdDFlag;
> sync CMD cmdDFlag;
>
>
> But not able to access the PV. It works only when I am creating this
> PV in IOC2.

This should work and does in all of my tests, and on many production
systems.

Do you get any error messages?

Could it be a problem with access security i.e. the other IOC cannot
access the PV at all (no read access)?

If these hints don't get you any further, I am willing to investigate
this in more depth, but for that more information is needed:

 * the exact versions of EPICS base and sequencer that you are using

 * under which OS the IOCs run

 * a complete log of the build and the IOC startup process for both IOCs
(please add them as attachment, not in the text part of the mail);

It would be helpful if you could run seqChanShow on the IOC that
contains the sequencer program, so we can see whether the PV is
connected at all.

Cheers
Ben
--
"Make it so they have to reboot after every typo." ― Scott Adams

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System