Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Tue, 4 Jun 2013 12:15:22 +0200

Hi Emmanuel

I'm a bit late to the party but here goes:

On Monday, June 03, 2013 10:28:52 Emmanuel Mayssat wrote:
> I am working on a seq program.For that program, I am interacting with magnet
> power supplies.The interfaces to the power supplies are all the same (about
> 10 PV each). For each interface PV, I would like do to something like
> this...
> #define NB_OF_SUPPLIES  50short enable[NB_OF_SUPPLIES];assign enable[0] to
> "I:S001:PS:EnableBO";assign enable[1] to "I:SO10:PS:EnableBO";...monitor
> enable; but programmatically.
> I looked at the docs and they are somewhat confusing.

If in doubt, always refer to the SNL Reference ;-)

> Q: Is there a place to put the pvAssign statement?

pvAssign is not a statement, but a (built-in) function. See

http://www-csr.bessy.de/control/SoftDist/sequencer/Reference.html#pvassign

This means you can call it anywhere in action code. Typical places are: in a
global entry block, in an entry block of some initial state of some state set,
in a state transition from some initial state.

> Q: Should the array's cell
> be initialized/assigned to ""  during declaration?

Yes, this is necessary because all (potentially) assign'ed variables must be
known statically. There are shorthands for this:

array int x[20];
double v;

assign v; /* same as assign v to "" */
assign x to {}; /* assign all elements to "" */

> Q: Can I monitor a
> not-yet configured PV array?

If you mean: before pvAssign was called (on some or all of the elements),
then: yes.

> Q: How can I find out about the connection to
> each of the PVs?

There are built-in functions pvConnected and pvAssigned, see

http://www-csr.bessy.de/control/SoftDist/sequencer/Reference.html#pvconnected

and

http://www-csr.bessy.de/control/SoftDist/sequencer/Reference.html#pvassigned

> etc. If anyone has an example of using pvAssign on array
> variables (i.e. enable),  I would appreciate it.

If someone has a nice, self-contained example program to illustrate these
things, I will happily add it to the examples directory.

Cheers
--
Ben Franksen
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System