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Troubleshooting Section 7-2
I/O Unit Connection Information
Error and Registered I/O Unit Addresses
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.
1: Error (OR of bits 0 to 4)
1: Refreshing I/O
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)
0 wd
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
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
Bit
+1 wd
No. Error content Probable cause Countermeasure
1 I/O Unit error (high-den-
sity connector type)
A hardware error has occurred in
an I/O Unit.
Replace the I/O Unit in which the hardware error
has occurred.
2 Communications power
supply overcurrent to 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.
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.
3 I/O Unit interface error The end connector is not con-
nected.
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.
The I/O Unit Connecting Cable is
broken.
Replace the broken cable.
There is a lot of noise. Remove the source of the noise.
Too many I/O Units are connected. Connect no more than 8 I/O Units for each Com-
munications Unit.
After taking the above measures, restart the Com-
munications Unit. If the problem persists, replace
the Communications Unit.
4 Configuration error The I/O Unit configuration was
changed while the Communica-
tions Unit was turned ON.
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.
5 Special I/O Unit error A specific error, such as no operat-
ing power supply, has occurred in
a Special I/O 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.
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