Re: [db] simple command ?

[Pavel Masloff <pavel.masloff@gmail.com>]

Hi Tim, guys

You are right - I want the record to automatically switch its value back to 0 after somebody sets it to 1. Time doesn't really matter. Imagine a pneumatic valve. I have two records two control it: cmd:valve_ON and cmd:valve_OFF. The reason I use two records instead of one is simply because  there are two buttons on the front panel of my control cubicle. And the PLC logic is that it checks whether only one button is pressed at a time. This is local control. Yet, at the same time I want to remotely control my system by means of EPICS.

Steve, do you recommend to change the SCAN field to passive?

--
Pavel

On Wed, Apr 4, 2012 at 6:12 PM, Tim Mooney <mooney@aps.anl.gov> wrote:

Hi Pavel,

I don't understand.  Do you want the record automatically to switch its value back to 0 after somebody sets it to 1?  Do you want the switch back to happen after some time interval?  If so, the bo record's HIGH field might do what you want.

Tim

----- Original Message -----
From: "Pavel Masloff" <pavel.masloff@gmail.com>
To: "EPICS Tech Talk" <tech-talk@aps.anl.gov>
Sent: Wednesday, April 4, 2012 8:42:40 AM
Subject: [db] simple command ?

Hello tech-talkers,


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?
Thank you.


--
Best regards,


Pavel Maslov, MS
Controls Engineer at Pulsed power Lab
Efremov Institute for Electro-Physical Apparatus
St. Petersburg, Russia

Mobile: +7 (951) 672 22 19
Phone: +7 (812) 461 01 01

--
Tim Mooney (mooney@aps.anl.gov) (630)252-5417
Software Services Group (www.aps.anl.gov)
Advanced Photon Source, Argonne National Lab

-- 
Best regards,


Pavel Maslov, MS
Controls Engineer at Pulsed power Lab
Efremov Institute for Electro-Physical Apparatus
St. Petersburg, Russia

Mobile: +7 (951) 672 22 19
Phone: +7 (812) 461 01 01