S7 Datablocks - PLCS.net

Robbe · October 11th, 2009, 06:56 AM

Hi all.
I'm trying to make a program, with a DB with integers. I read out a specific DB value, and add 1 to it with "ADD_I":

Code:

      A     I    125.0
      FP    M      4.0
      JNB   _001
      L     DB1.DBW    0
      L     1
      +I    
      T     DB1.DBW    0
_001: NOP   0

When I simulate the program, and I monitor DB1, it adds 1. But when I close the simulator, it's 0 again.

When I would download the program to a real PLC, and I'll do this, and then I disconnect the PLC from the net, will the value's be 0 again to?

PeterW · October 11th, 2009, 08:21 AM

No, the simulator resets when closed down, the PLC is not dependant on any connection to maintain values.

Robbe · October 11th, 2009, 08:25 AM

Quote:

Originally Posted by PeterW

No, the simulator resets when closed down, the PLC is not dependant on any connection to maintain values.

Thank you

October 11th, 2009, 06:56 AM	#1
Robbe Member Join Date: Oct 2009 Location: Belgium Posts: 2	S7 Datablocks Hi all. I'm trying to make a program, with a DB with integers. I read out a specific DB value, and add 1 to it with "ADD_I": Code: A I 125.0 FP M 4.0 JNB _001 L DB1.DBW 0 L 1 +I T DB1.DBW 0 _001: NOP 0 When I simulate the program, and I monitor DB1, it adds 1. But when I close the simulator, it's 0 again. When I would download the program to a real PLC, and I'll do this, and then I disconnect the PLC from the net, will the value's be 0 again to?

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October 11th, 2009, 08:21 AM	#2
PeterW Member Join Date: Jun 2006 Location: Edmonton Posts: 2,418	No, the simulator resets when closed down, the PLC is not dependant on any connection to maintain values.

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