Details Of The I/O Signals - Mitsubishi MELSEC-Q Series User Manual

8 PROGRAMMING

8.2.2 Details of the I/O signals

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The following explains the on/off timings and conditions of the I/O signals shown in
Table 8.1:
(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.
OFF: Data link is stopped
ON : Data linking in progress
(3) Other station data link status: Xn3
This signal indicates the data link status of other stations (remote, local,
intelligent device and standby master stations).
The SB0080 signal has the same contents.
OFF: All stations normal
ON : There is a faulty station (the faulty station status is stored in SW0080 to
SW0083)
(4) Module ready: XnF
This signal indicates whether the module is ready to operate.
(a) When the module reaches ready-to-operate status, this signal turns ON
automatically.
(b) This signal turns OFF when either of the following conditions occurs:
1) When an error is detected in the switch setting status for the module
2) When the module error signal (Xn0) turns ON
Module ready
(XnF)
Module error
(Xn0)
Power ON
MELSEC-Q
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