Experimental Physics and Industrial Control System
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Additional info:
In my specific case, the signal to process is a diagnostic signal.
So it doesn't need to be read permanently. Let's say once every 30 sec,
I process the input. Actually I was thinking about having another record
to turn on or off the record processing.
I have 40 of those inputs.
A hardware solution would definitely be better, but because of space,
cost, and time considerations it was decided that I, the software
programmer, would take care of it.
--
E
Ned Arnold wrote:
Two suggestions ...
1) Since you are looking for a transition, choose a TTL input module
whose inputs can be configured to generate an interrupt on a
transistion, have this interrupt process a calc record that simply
increments, and have another calc record that makes sure the first calc
record increments at least 100 times over a second (or 10 times every .1
second).
2) OR, add a little FPGA circuit (or a timer relay) that expects a
transition every 10 milliseconds (a simple watchdog) and use this output
to drive the digital input. This is preferred because it eliminates
100Hz processing of records.
Ned
- References:
- Browsing the ioc error log file Ned Arnold
- Re: Browsing the ioc error log file Ralph Lange
- Reading a synchronous input with an asynchronous device. Emmanuel Mayssat
- Re: Reading a synchronous input with an asynchronous device. Ned Arnold
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R3.14.7 errlog problem Marty Kraimer
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ANJ, 02 Sep 2010 |
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