Experimental Physics and
Industrial Control System

"Hartman, Steven M." <[email protected]> · Wed, 4 Apr 2012 09:59:19 -0400

On Apr 4, 2012, at 9:42 AM, Pavel Masloff wrote:

> I would like to implement a simple command record, the idea of which is to switch its VAL to 1 and then back to 0. Let's assume we have got the following record:
> 
> record (bo,"cmd:valve_trigger")
> {
>     field(PINI, "YES")
>     field(DTYP, "S7plc")
>     field(OUT, "@plc/0 T=UINT8 B=0")
>     field(SCAN, "I/O Intr")
>     field(ONAM, "ONE")
>     field(ZNAM, "ZERO")
> } 
> 
> Is there any straightforward solution?

Yes . . . 

    field(HIGH,"0.5")

where "0.5" is a floating point value representing the number of seconds to hold the VAL to 1 before resetting it back to 0.

(And you probably don't want the bo record to scan on I/O interrupt. More typically, output records are Passive.)

-- 
Steven Hartman
[email protected]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System