Siemens SIMATIC S5 CP 523 Manual page 216

Using the "SEND" and "RECEIVE" Function Blocks
Segment 4
Segment 5
Yes
Output error
message
END
8-26
2
Transfer "Receive" ID to the CP
Read acknowledgement from CP
Acknowledge with error?
No
3
Establish "RECEIVE" connection to CP 523
Evaluate job acknowledgement from CP 523
CP 523
EWA 4NEB 811 6044-02a