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First Scan

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#1 machinemaker

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Posted 28 November 2012 - 04:06 PM

Is there a first scan bit. I just want to reset a couple of bits on the first scan when powering up. If not, how would one of you do that? I was thinking of executing a subroutine on start up. I am using a MicroLogix 1200 for this project.

#2 b_carlton

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Posted 28 November 2012 - 04:20 PM

S:1/15 - to find more info in RSLogix 500 under 'help' then on the 'search' tab type 'first scan'.

Edited by b_carlton, 28 November 2012 - 04:21 PM.

An output is a PLC's way of getting its inputs to change.

#3 Tech Fred

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Posted 28 November 2012 - 04:48 PM

S:1/15 is the fist scan bit. See http://literature.ro...p.pdf#page=395.

Is there a first scan bit. I just want to reset a couple of bits on the first scan when powering up. If not, how would one of you do that? I was thinking of executing a subroutine on start up. I am using a MicroLogix 1200 for this project.


Fred Loveless
Senior Applications Engineer
Kepware Technologies
www.kepware.com


#4 machinemaker

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Posted 28 November 2012 - 05:40 PM

S:1/15 is the fist scan bit. See http://literature.ro...p.pdf#page=395.


Is there a first scan bit. I just want to reset a couple of bits on the first scan when powering up. If not, how would one of you do that? I was thinking of executing a subroutine on start up. I am using a MicroLogix 1200 for this project.

Thanks guys, there is nothing about this bit in HELP. Also I did not see it the manual either. whoops found it. They call it first pass. Was under main status.




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