After you effect I/O assignment, the software automatically propagates the tag signals. Four situations can exist:
Case 1
In this example, the signal sequence is from the device panel up to the PLC cabinet with all the wiring:
Case 2
In this case the connection sequence starts from the device panel and continues to the PLC cabinet, however, there is a discontinuity between Strip 1 and Strip 2 of the marshaling rack:
Note that the wiring sequence can be different depending on the completeness of the connection:
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From 1 to 8 (as in the first case) — connected from the device panel to the PLC.
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From 1 to 4 and from 99 to 100 (as in the second case) — there is a break in the middle of the connection.
Case 3
The signal sequence is from the device panel to the PLC cabinet however, there is a discontinuity between the marshaling rack and the PLC cabinet.
Case 4
The connection sequence starts from the PLC cabinet and continues to the junction box. The device panel is absent.
