Entry type: FAQ Entry ID: 217293, Entry date: 02/09/1998
Monitoring whether OP on STEP 7 is on-line or off-line
How can I see in my STEP 7 user program whether my OP is on-line or off-line?
Proceed as follows to evaluate the operating state of the OP in STEP 7:
- Create an interface area 32 bytes long in the STEP 7 in order to evaluate the life bit of your OP.
- Open the self-extracting file by clicking the
watchdog.exe (22738 Bytes)
- Copy the included function block into your STEP 7 configuration. To do this click with the right mouse button "Insert new object" => "1 External source" in the folder "Sources" (SIMATIC Manager => "SIMATIC Station" => "CPU" => "S7 Program" =>"Sources").
- Enter the number of the interface data block and the initial address into this function block. A standard value for the monitoring time is 10s.
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