Mitsubishi Electric MELSEC-Q Series User Manual page 199

4) Set the switch on the head module to RUN.
When the head module switch is set to RUN, the head module starts data link.
5) When the following are operated on the master station, an analog value is
output from the D/A converter module (L60DA4).
When X22 is turned on, a digital value is set in CH1 and CH2 of the D/A
converter module (L60DA4).
When X21 is turned on, an analog value is output from the D/A converter
module (L60DA4).
When X24 is turned on, the warning output is cleared.
When an error occurs in the D/A converter module (L60DA4), an error code is
output in BCD notation from the output module (QY10) of the master station.
When X25 is turned on, an error clear request is sent to the D/A converter
module (L60DA4).
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Chapter 11 PROGRAMMING