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Siemens AG
Entry type: FAQ Entry ID: 217293, Entry date: 02/09/1998
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Monitoring whether OP on STEP 7 is on-line or off-line

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QUESTION:
How can I see in my STEP 7 user program whether my OP is on-line or off-line?

ANSWER:
Proceed as follows to evaluate the operating state of the OP in STEP 7:

  1. Create an interface area 32 bytes long in the STEP 7 in order to evaluate the life bit of your OP.
  2. Open the self-extracting file by clicking the following symbol:
    watchdog.exe (22738 Bytes)
  3. 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").
  4. 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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