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Troubleshooting with the DeviceNet Unit Indicators Section 9-1
remote I/O communications for a communications error, two errors can be
displayed: The slave’s communications error and its most recent error.
Master Errors
Remote I/O
Communications Stopped
by a Communications
Error
Likely Cause
Pin 3 on the master’s DIP switch is set to stop communications in the event of
a communications error and communications have been stopped due to a
remote I/O communications error, network power supply error, or transmission
timeout.
DeviceNet Unit Response
Remote I/O communications as a master will stop. Remote I/O communica-
tions as a slave and message communications will continue.
Flags Allocated for C200H DeviceNet Master Unit (CIO n+24)
Bit 14 (the Error Flag) will be ON as well as bit 05 or 06 (the Sending Error
Flag or Communications Error Flag).
CIO Area Flags Allocated to DeviceNet Unit
Bit 00 of n+10 (Unit Error Flag) will be ON together with one of the following
combinations:
• Bit 02 of n+12 (the Remote I/O Communications Error Flag) and bit 01 of
n+10 (the Master Function Error Flag) ON.
• Bit 07 of n+10 (the Network Power Error Flag) ON.
• Bit 08 of n+10 (the Send Timeout Flag) ON.
Correction
Perform error processing according to the cause:
• Remote I/O communications error (See error d9.)
• Network power supply error (See error E0.)
• Transmission timeout error (See error E2.)
Correct the cause of the error and then restart remote I/O communications by
toggling bit 02 of n (the Remote I/O Communications Start Switch.)
Structure Error:
I/O Area Duplication
Likely Cause
The slave’s I/O areas overlap. (Occurred with the scan list disabled.)
Errors will occur in the active slaves.
DeviceNet Unit Response
Records the error in the error log.
The master will periodically attempt to reconnect with the slave with the struc-
ture error.
Flags Allocated for C200H DeviceNet Master Unit (CIO n+24)
Bit 14 (the Error Flag) and bit 04 (the Structure Error Flag) will be ON.
CIO Area Flags Allocated to DeviceNet Unit
Bit 01 of n+12 (the Structure Error Flag) and bits 00 and 01 of n+10 (the Unit
Error Flag and Master Function Error Flag) will be ON.
7-segment MS indicator NS indicator Error log (Hex)
A0 --- --- 0346
7-segment MS indicator NS indicator Error log (Hex)
d0 --- Red (flashing) 0343