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rslogix500 on SLC major and minor fault digital output on major fault and minor fault Rate Topic: -----

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User is offline   mikey431 

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I know that on the SLC 503 when the processor has a major fault ,the processor will stop scanning and all the oputput is de-energized , does anybody know is it do the same on minor fault ?
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View Postmikey431, on Jun 15 2007, 09:18 AM, said:

I know that on the SLC 503 when the processor has a major fault ,the processor will stop scanning and all the oputput is de-energized , does anybody know is it do the same on minor fault ?



I think is the same, processor have only one fault mode. (Program, Run, Faulted, Test)
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User is offline   Gnex 

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Quote

I know that on the SLC 503 when the processor has a major fault ,the processor will stop scanning and all the oputput is de-energized , does anybody know is it do the same on minor fault ?



I think, Major or minor fault is only in CLX environment, RS500 has only fault. correct me if I'm wrong.
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SLC has Major & minor faults



Minor Error were grouped in S:5

These bits of this word are set by the processor to indicate that a
minor error has occurred in your ladder program. Minor errors,
bits 0 to 7, revert to major error 0020H if any bit is detected as
being set at the end of the scan. HHT users: If the processor
faults for error code 0020H, you must clear minor error bits
S:5/0-7 along with S:1/13 to attempt error recovery.
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View Postmikey431, on Jun 15 2007, 09:18 AM, said:

I know that on the SLC 503 when the processor has a major fault ,the processor will stop scanning and all the oputput is de-energized , does anybody know is it do the same on minor fault ?



You can can trap and remember a minor fault and then keep a program running by creating logic to set a bit and then clear the minor fault before an end statement is scanned. Then you can do whatever you want in your program with that bit.

eg. If S:5/0 latch B3/0 and then clear S:5/0

XIC S:5/0 BST OTL B3/0 NXB OTU S:5/0 BND

On a major fault you cannot have any digital output on. What you can do is have a digital output that is always on whenever the PLC is in run mode.

This post has been edited by Alaric: 29 June 2007 - 08:45 PM


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