Hello to everyone, 

I am trying to use a HW Interrupt OB during runtime using the ATTACH instruction. 
I followed the example that is mentioned in Help of TIA Portal for the ATTACH instruction, however it does not seem to work as even if I give the interrupt signal the HW Interrupt OB is not processed. It works only if I give physically give a rising edge at I0.0. I even used the program provided in Sample Library for Instructions with the same result.

The CPU used is S7-1214C FW4.6 (physical CPU, not PLCSIM) and the program was made with TIA PORTAL V19.  

I understand that a HW Interrupt OB can only be processed when a rising or negative edge is detected from the corresponding input. In this case, is the example used only as a reference to explain how the instruction works and it will not trigger the HW interrupt? Or does it require different HW to work properly? 

I attach my sample project as well.

Thank you in advance. 

qwazee

 

ThanosMrtds

Hello to everyone, 

I am trying to use a HW Interrupt OB during runtime using the ATTACH instruction. 
I followed the example that is mentioned in Help of TIA Portal for the ATTACH instruction, however it does not seem to work as even if I give the interrupt signal the HW Interrupt OB is not processed. It works only if I give physically give a rising edge at I0.0. I even used the program provided in Sample Library for Instructions with the same result.

The CPU used is S7-1214C FW4.6 (physical CPU, not PLCSIM) and the program was made with TIA PORTAL V19.  

I understand that a HW Interrupt OB can only be processed when a rising or negative edge is detected from the corresponding input. In this case, is the example used only as a reference to explain how the instruction works and it will not trigger the HW interrupt? Or does it require different HW to work properly? 

I attach my sample project as well.

Thank you in advance. 

You said: "..it does not seem to work as even if I give the interrupt signal the HW Interrupt OB is not processed. It works only if I give physically give a rising edge at I0.0." 

This causes some confusion for me. Could you detail what type of behaviour you are expecting and which you are actually getting. Some timing diagram (photo of hand drawing) may be helpful.

 Apologies if I did not made clear my problem. 

Please see below the quote from Help of TIA Portal: 

QUOTE

UNQUOTE

I follow the above instructions, however when I set the "Signal" variable in Network 2, OB40 is not executed even if the PLC Tag I0.0 is set. 

I manage to call the OB only when I actually apply 24V DC to Input I0.0 which is something different than the solution mentioned in the example. 

I am trying to see why the example mentioned in Help is not working.

I attach also relevant pages from Help for better reference. 

Thank you. 

qwazee

My helpfulness to your question is severely limited by the fact that I do not have a V19 license. I am working with a printout of your project.

Did you see this note in the code?

The hardware configuration is probably not correctly set to the note specifications. There is also the filter time that is set to a long 20ms period.

 Thank you for your time and your effort. 
I followed the instructions in the note and also changed the input filter to the shortest possible. Still not working. For S7-1200, channels of DI modules do not offer rising edge detection. Perhaps I should try with different hardware (i.e. ET200SP CPU or S7-1500) and see the outcome, although no hardware limitations are mentioned.

Dear qwazee, 

I totally understand what you mean. I use the on-cpu inputs for interrupts. 

Thank you for your time.

qwazee

 

ThanosMrtds

Thank you for your time and your effort. 

I followed the instructions in the note and also changed the input filter to the shortest possible. Still not working. For S7-1200, channels of DI modules do not offer rising edge detection. Perhaps I should try with different hardware (i.e. ET200SP CPU or S7-1500) and see the outcome, although no hardware limitations are mentioned.

The ATTACH instruction is not a requirement to make the hardware interrupt work. The configuration can be done in the hardware configuration. What is a must is only on-cpu inputs can be used. This includes signal boards. This is the case with the high speed counters also.

Your mention of the "channels of DI modules" confuses me. Are you using on-cpu inputs or are you using signal modules (expansions)? 

Also be very sure that you load the hardware configuration correctly. Have the project highlighted in the tree structure when making a download. The PLC should go to stop mode. Attempt to make the interrupt work with only the hardware configuration set. This is what I do. Then I use DETACH and ATTACH to deactivate / activate the interrupts.