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I am investigating the possiblity of using an IM151-8 for an application that I have verified I can do with an S7-214 (224XP) processor, for the connection to profinet. In order to meet the requirements of the application, I had to use the immediate output coil [--(I)--] in several places in my test program. I do not see this instruction in the Step 7 Pro instruction list. Am I missing something or does the S7-200 series do something important that the more "full featured" S7-300 stuff does not? I am waiting to hear from the hotline...
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Immediate output update
Step 7 / ET200S
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#1
Posted 14 August 2009 - 02:11 PM
- Sparky
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#2
Posted 15 August 2009 - 09:17 AM
- Automation Engineer
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I expect someone will come back with a method for it, but I've only used the S7-200. I would imagine its just different in the larger PLCs, not that its not there.
#3
Posted 17 August 2009 - 10:34 AM
- Sparky
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- Group: MrPLC Member
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Country:United States
The guy from the hotline explained that there is no bit instruction for immediate update. Must do a move (byte,word or double word) from memory to the output address with a P. i.e. MOV MB0 PQB0 (using MB0 as an "image" for the desired value of the outputs). I tried it and it works.
Ian
Ian
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