Appendices; Appendix 1 Description Of I/O Signals - Mitsubishi Electric MELSEC-Q Series User Manual

APPENDICES

Appendix 1
This appendix describes on/off timing and conditions of I/O signals.
(1) Module error: Xn0
This signal indicates whether the module is normal or faulty.
OFF: Module normal
ON: Module error
Module error
(Xn0)
Module ready
(XnF)
(2) Host data link status: Xn1
This signal indicates the data link status of the host station.
Host station operation status (SB006E) has the same functionality. Use either of Xn1 or SB006E for
programming.
Note that the on/off conditions of Xn1 are the opposite to those of SB006E. The conditions of Xn1 are as follows:
OFF: Data link stopped
ON: During data link
(3) Other station data link status: Xn3
This signal indicates the data link status of other stations (remote station, local station, intelligent device station,
and standby master station).
Other station data link status (SB0080) has the same functionality. Use either of Xn3 or SB0080 for programming.
OFF: All stations normal
ON: A faulty station exists. (The status of the faulty station is stored in SW0080 to SW0083.)
It takes maximum of six seconds for Other station data link status (Xn3) to turn on after a slave station connected to the
master station or local station becomes faulty.
The time until this signal turns on differs depending on the system configuration and error status.
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Description of I/O Signals