FC block issue

Hello everyone,  I need helps a little bit. I made new FC block in old working program. There is i use fc 105 for two analog input, it works perfectly in simulator. . I used standard method call fc17 in OB1. Problem was when i download changing in PLC. Somehow this affects the main program, which stops working correctly. There are not any mistake in buffer or alarm led, just working wrong.

How i must write program in OB 1 and in FC to guarantee not to affect the main program?

andreyb

Hello everyone,  I need helps a little bit. I made new FC block in old working program. There is i use fc 105 for two analog input, it works perfectly in simulator. . I used standard method call fc17 in OB1. Problem was when i download changing in PLC. Somehow this affects the main program, which stops working correctly. There are not any mistake in buffer or alarm led, just working wrong.

How i must write program in OB 1 and in FC to guarantee not to affect the main program?

When you say "stops working correctly" -- what does that mean?
What happens if you comment out the code you added?.. does it function correctly then?

Which PLC are you using?
More to the point.. how deep is the memory marker addresses for the PLC?

qwazee

 

andreyb

Hello everyone,  I need helps a little bit. I made new FC block in old working program. There is i use fc 105 for two analog input, it works perfectly in simulator. . I used standard method call fc17 in OB1. Problem was when i download changing in PLC. Somehow this affects the main program, which stops working correctly. There are not any mistake in buffer or alarm led, just working wrong.

How i must write program in OB 1 and in FC to guarantee not to affect the main program?

When you say "stops working correctly" -- what does that mean?
What happens if you comment out the code you added?.. does it function correctly then?

Which PLC are you using?
More to the point.. how deep is the memory marker addresses for the PLC?

 Helllo, it means, operator from Win CC can not control system, process included some steps, is stopping  on the 17 step( i tryed made FC 17). I tryed comment my code in OB 1 (it was in second nw) it wasn't effective. System started worked when I deleted my FC 17 with 3 easy nw ( on picture in before).The step-by-step execution of the program is disrupted.

Plc type ist CPU 317-2 PN/DP

on the pictures some details

Hi,

Memory address area is overlapping in your code .

Please correct it.

Br,

AmolG.

AmolG

Hi,

Memory address area is overlapping in your code .

Please correct it.

{picture}

Br,

AmolG.

@AmolG:
Hi Amol. I hope you are doing well.

Those are not the only 'overlapping' memory to speak of.
In the way the memory is used, the 'overlap' memory is not an issue; The implementation of the code is okay.

@andreyb:
I do not understand why you would have the result you have. Not knowing the surrounding code, does not help.

Commenting all the code lines should not have the effect you see. Only scan cycle time is effected when code lines are commented out. Unless the WinCC 'measures' the footprint / size of the code running in the PLC -- to prevent tampering.

Consider creating a support request with Siemens if no forum volunteer comes forward with an idea. But you will have to be very specific on how you measure the system not behaving correctly.

Hello all, 

one interesting thing. I wrote today the same code in one old FC block. Everything work perfectly. Issue appears only when i made new FC block and wrote it in OB1.

 and second question how  can I set up analog inputы jumps in the program?

https://youtu.be/UeStlCEyi9w