Mitsubishi MELSEC QS Series, User Manual

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APPENDICES
Appendix 7 Dedicated Instructions which can be used in Safety CPU
Module
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Appendix 7.2 Programming using dedicated instructions
Since the safety CPU module does not support the intelligent function module device (U
G ) and the FROM/TO instructions, data stored in the buffer memory of the intelligent
function module cannot be used in the sequence program of the safety CPU module.
To use data stored in the buffer memory of the intelligent function module in the sequence
program of the safety CPU module, use I/O signals, which correspond to the buffer
memory, of the intelligent function module.
In order to use dedicated instructions listed in TableApp.29, replace the programs using
the FROM/TO instructions with the programs using the I/O signals.
Sample programs where the intelligent function module device (U G ) and the FROM/
TO instructions are replaced with I/O signals are described below.
TableApp.29 List of targeted dedicated instructions
Dedicated instruction Function description Reference
OPEN Establishes a connection. (1) in this section
CLOSE Disconnects a connection. (2) in this section
BUFRCV Reads received data. (for main program) (3) in this section
BUFSND Sends data. (4) in this section
UINI Reinitializes the Ethernet module. (5) in this section