Siemens SIMATIC S5 Manual page 101

2 Engineering
5. In the "Diagnostics" tab, go to the "Connection information" (4).
Under "Connection details", an established connection via the CP1543-1 can
be recognized from a green marking in the "Online status" (5). In this section,
further details of the connection diagnostics are available.
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Test and diagnostics of communication in the SIMATIC S5
To monitor the send/receive communication of scenario 2a in the SIMATIC S5-
CPU, call the watch table "BB12" in STEP 5.
The count value (3) is cyclically written in the S7-1500 CPU every second and the
mirrored incremented value is received again (4).
The communication and connection status of the SEND (1) and RECEIVE blocks
(2) can be evaluated via the indicator words (ANZW) of the HTBs.
Ethernet Communication (ISO on TCP) between SIMATIC S5 and
SIMATIC S7-1500 Controllers
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