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4-5
Starting and Stopping Remote I/O
Communications
4-5-1
Starting Remote I/O Communications
Remote I/O communications start automatically after the Unit is restarted or the Controller is reset,
including when the power is turned ON.
The *_Mstr1IOCommSta (I/O Data Communications Status) is changed to TRUE when remote I/O
communications is started with at least one slave.
4-5-2
Stopping Remote I/O Communications
Remote I/O communications stop under the following user-controlled conditions. Message communica-
tions can still be performed when the remote I/O communications stop.
Stop Communications with All Slaves
When *_Sw1IOCommStopCmd (Remote I/O Communications Stop Switch) is changed to TRUE.
Stop Communications with a Specified Slave
When associated device variables for CJ-series Unit *_CnctNdCmd[0] to *_CnctNdCmd[63] (Dis-
connect/Connect Switches for Node Address 0-63 Slave) are changed to TRUE (Disconnected
when changed to TRUE).
Note The communications cycle time is not shorter even though a slave was disconnected from
remote I/O communications by setting the Disconnect/Connect Switch to TRUE. (Blank time
in the communications cycle will only be increased.)
4-5-3
Restarting Remote I/O Communications
Remote I/O communications restart under the following conditions.
Restart Communications with All Slaves
Remote I/O communications restart when *_Sw1IOCommStartCmd (Remote I/O Communications
Start Switch) is changed to TRUE. (Only communications with slaves with the Disconnect/Connect
Switch changed to FALSE will be restarted.)
Restart Communications with Specified Slave
When associated device variables for CJ-series Unit *_CnctNdCmd[0] to *_CnctNdCmd[63] (Dis-
connect/Connect Switches for Node Address 0-63 Slave) are changed to FALSE. (Connected when
changed to FALSE.)
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
4 Remote I/O Master Communications
4
4-31
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