What should you watch out for when using an ASM456 in a Y-link (IM153)?
If you are using the ASM456 in a Y-link (IM153), this might affect operation of the PROFIBUS.
A too short a timeout setting (PollTimeOut) in the CPU can adversely affect the acyclic services of the PROFIBUS.
You can avoid this behavior by changing the C1_Response_Timeout in the GSD file of the ASM456.
You can correct the case described by changing the timeout settings via the GSG file (6GT2 002-0ED00) of the ASM456. Reduce the "C1_Response_Timeout" from the default value of 10 (= 100ms) to 5 (= 50ms).
The table below describes the procedure required for this.
|No.||Procedure||Notes / Explanation|
|1||If ASM456 is already configured, then remove the module from your HW Config project and run Save and compile.
|2||The GSG file is in the following directory on your hard disk: <Drive:>\ Program Files\Siemens\Step7\S7DATA\GSD.||Alternatively, you can download the GSG file (station type: ASM456) in Entry ID: 113562 and unpack it with WinZip.|
|3||Open the GSG file with a simple editor, e.g. Notepad. Reduce the parameter "C1_Response_Timeout" from the default value of 10 (= 100ms).
Repeat this with the GSE, GSF, GSI and GSS file(s).
|Make sure that this time is not too short, otherwise the ASM456 causes timeout errors.|
If you have changed the language of the SIMATIC Manager, access is made to a GSD in a different language. Therefore, you should change all the files.
|4||Save and integrate the changed GSG file in the STEP 7 hardware catalog .||The following FAQ describes how to proceed in this case: "How do you integrate a GSD file into the STEP 7 HW Config for PROFIBUS or PROFINET?" (Entry ID: 2383630).|
|5||Drag the ASM456 GSG from the hardware catalog PROFIBUS DP -> Other Field Devices -> Ident Systems -> MOBY -> ASM456 and drop it in your HW Config project.||Then run Save and compile and Load in module to integrate the changed GSG.|