Figure 42: Timing Diagram For The Error Handshake - WAGO 750-325 Manual

94 Commissioning
8.5.2 Error Handshake
The error handshake is run in the user program as follows:

Figure 42: Timing Diagram for the Error Handshake

1. If an error occurs on the fieldbus coupler, it first sets the RX(m+n)B flag
(Remote station ready) back to '0'.
2. It then sets the RX(m+n)A flag (Error state) to '1' to indicate the error.
3. The user program on the master sets the RY(m+n)A flag (Error reset
request) to '1' to request an error correction.
4. Once the error has been resolved, the fieldbus sets the RX(m+n)A flag
(Error state) back to '0'.
5. The user program on the master also sets the RY(m+n)A request flag
(Error reset request) back to '0'.
6. By setting the RX(m+n)B flag (Remote station ready) to '1', the fieldbus
then indicates that communication has been restored.
Manual
Version 2.0.1
WAGO-I/O-SYSTEM 750
750-325 CC-Link Fieldbus Coupler