Omron DEVICENET#05-2003 Operation Manual page 206

Troubleshooting
0 wd
No. Error content
1 I/O Unit error (high-den-
sity connector type)
2 Communications power
supply overcurrent to an
I/O Unit
3 I/O Unit interface error
4 Configuration error
5 Special I/O Unit error
198
I/O Unit Connection Information
1: Error (OR of bits 0 to 4)
1: Refreshing I/O
Error and Registered I/O Unit Addresses
+1 wd
Probable Causes of Errors and Countermeasures
Use the status area to determine the error content and the I/O Unit address
where the error occurred, and then take action according to the following
table.
Probable cause
A hardware error has occurred in
an I/O Unit.
The power supply to the I/O Unit
interface has shorted.
The current consumption of the I/O
Unit interface exceeds 0.4 A.
The end connector is not con-
nected.
The I/O Unit Connecting Cable is
broken.
There is a lot of noise.
Too many I/O Units are connected. Connect no more than 8 I/O Units for each Com-
The I/O Unit configuration was
changed while the Communica-
tions Unit was turned ON.
A specific error, such as no operat-
ing power supply, has occurred in
a Special I/O Unit.
Bit
1: Special I/O Unit Error
1: Configuration Error
1: I/O Unit Interface Error
1: I/O Unit Power Supply Overload
1: I/O Unit Error (High-density Connector Type)
The bits corresponding
to registered I/O Units
are turned ON. Bits 0 to
7 correspond to
addresses 0 to 7.
1: Registered
0: Not registered
Replace the I/O Unit in which the hardware error
has occurred.
Check that the I/O Unit communications cable has
not shorted.
Check that the total current consumption of the
communications power supply for the I/O Units
does not exceed 0.4 A.
After taking the above measures, restart the Com-
munications Unit. If the problem persists, replace
the Communications Unit.
After turning OFF the power supply to the Com-
munications Unit and all I/O Units, attach the end
connector to the I/O Unit interface connector 2 on
the terminal I/O Unit.
Replace the broken cable.
Remove the source of the noise.
munications Unit.
After taking the above measures, restart the Com-
munications Unit. If the problem persists, replace
the Communications Unit.
After turning OFF the power supply to the Com-
munications Unit and all I/O Units, return to the
correct I/O Unit configuration, and restart the
Communications Unit. If the problem persists,
replace the Communications Unit.
Check the operating power supply, and provide
the correct power supply. If the problem persists,
replace the Special I/O Unit in which the error
occurred.
Section 7-2
Bit
The bits corresponding
to I/O Unit with errors
are turned ON. Bits 8 to
15 correspond to
addresses 0 to 7.
1: Error
0: No error, or not
part of network
Countermeasure