Seneca S6001-RTU, User Manual

Page: 199 / 210

USER MANUAL – Z-TWS4/Z-PASS2-S/S6001-RTU
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This Function Block can be used to read a tag from an OPC-UA Server.
When first called, it runs a process which starts the procedure;
on subsequent calls, it only checks if the process has finished its job.
The FB has the following input parameters:
- CONN_ID : connection identifier, given by the UAC_CONNECT FB
- TAG : name of the tag to be read
- NS_ID : tag name namespace index
- @VALUE : variable to store the tag value
- @ENABLE : TRUE -> FB is executed
FALSE -> FB is skipped
The FB has the following output parameters:
- RESULT : -2, when called with ENABLE=FALSE
-1, in case of any failure
0, if the process is still running
1, if the process has successfully finished
19.1.26 UAC_WRITE
This Function Block can be used to write a value to a tag of an OPC-UA Server.
When first called, it runs a process which starts the procedure;
on subsequent calls, it only checks if the process has finished its job.
The FB has the following input parameters:
- CONN_ID : connection identifier, given by the UAC_CONNECT FB
- TAG : name of the tag to be written
- NS_ID : tag name namespace index
- VALUE : variable to be written to the tag
- @ENABLE : TRUE -> FB is executed
FALSE -> FB is skipped