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Normbourne
Power-User

Join Date: Jan 2009
Location: Townsville, Australia
Posts: 149

Simatic S5 PLC's

07/17/2011 11:58 PM

Hi Guys,

I've come across a situation in a 100U plc where in the Program documentation, it has a

Block, namely OB34, yet when I do a block transfer from the PLC, or interrogate the directory, there is no sign of it..! Am I right in thinking that that particular block, isn't in the PLC, or is it a block with special attributes that prevent it's being read...??

Norm.
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Jagote
Associate

Join Date: Feb 2010
Location: Birmingham, England
Posts: 44
Good Answers: 2
#1

Re: Simatic S5 PLC's

07/19/2011 4:27 AM

From the book...

The CPU constantly checks the status of the battery in the power supply. If a battery fails (BAU), OB34 is processed before every cycle until the battery is replaced. You can program the reaction of the programmable controller to battery failure in OB34. If OB34 is not programmed, there is no reaction.

It sounds like it hasn't been used in your program.
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Normbourne
Power-User

Join Date: Jan 2009
Location: Townsville, Australia
Posts: 149
#2
In reply to #1

Re: Simatic S5 PLC's

07/21/2011 8:42 PM

Hi Brum, From one Brummie to another, thank you for your help, very much appreciated. regards Norm.
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Jagote
Associate

Join Date: Feb 2010
Location: Birmingham, England
Posts: 44
Good Answers: 2
#3
In reply to #2

Re: Simatic S5 PLC's

07/22/2011 8:09 AM

It's a small world! Glad to have helped.
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