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Troubleshooting with the DeviceNet Unit Indicators Section 9-1
CIO Area Flags Allocated to DeviceNet Unit
Bits 00 and 04 of n+10 (the Unit Error Flag and Unit Memory Error Flag) will
be ON.
Correction
Replace the Unit if the error recurs.
CPU Unit Exchange Errors
Unit Number duplication
Likely Cause
The unit number is duplicated on another Unit.
DeviceNet Unit Response
Stops operation.
Correction
Set the unit numbers correctly and restart the DeviceNet Units.
CPU Unit Faulty (H2)
DeviceNet Unit Response
Stops operation.
Correction
Replace the CPU Unit if the error recurs when the CPU Unit is restarted.
DeviceNet Unit Faulty
DeviceNet Unit Response
Stops operation.
Correction
Replace the DeviceNet Unit if the same error recurs when the Unit is mounted
to another CPU Unit.
Node Address Setting
Error
Likely Cause
The node address set on the rotary switches is out-of-range (64 or higher.)
DeviceNet Unit Response
Stops operation.
Correction
Set the node address correctly and restart the DeviceNet Units.
Communications Speed
Setting Error
Likely Cause
The communications speed is set incorrectly.
7-segment MS indicator NS indicator Error log (Hex)
H1 Red (flashing) OFF ---
7-segment MS indicator NS indicator Error log (Hex)
H2 Red (flashing) OFF ---
7-segment MS indicator NS indicator Error log (Hex)
H3 Red (lit) OFF ---
7-segment MS indicator NS indicator Error log (Hex)
H4 Red (flashing) OFF ---
7-segment MS indicator NS indicator Error log (Hex)
H5 Red (flashing) OFF ---