PLC5 Structured Text Programming

L

Thread Starter

lxman2000

I am just beginning with ST. I would very much appreciate it if someone could point me in the right direction to find some good examples. Or if anyone could email me some I would appreciate that too.

I also have in particular one issue right now.

What is the proper syntax for an ONS?

I put in, for example:

IF B3:0/6 ONS B3:0/7 THEN (Compile Error)
IF B3:0/6 AND ONS B3:0/7 THEN (No error but it doesn't fire for one cycle when B3:0/6 goes true)

How do I do this properly?

I've looked through the PLC5 ST manual, but I'm not finding it there.
 
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Friedrich Haase

Moin Mr. lxman2000,
moin all,

I doubt you can use ONS this way. At least it is not part of the IEC 61131 standard Structured Text language. From the AB docs I assume ONS is restricted to be used with ladder. Try to detect the edge by yourself.

For examples in ST you use http://www.61131.com or some other 61131 compliant software.

Hope this helps
Friedrich Haase

Ing.-Büro Dr. Friedrich Haase
Consulting - Automatisierungstechnik
Meliesallee 42
D 40597 Düsseldorf
Germany
phone +49 (211) 716026
fax +49 (211) 7182045
email [email protected]
email [email protected]
WEB http://www.61131.com
 
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