Mitsubishi MELSEC-WS0-CPU0 User Manual page 86

Chapter 10
LED indication on module
CPU module Safety I/O module
(WS0-CPU0, WS0-
(WS0-XTIO or
CPU1 or WS0-CPU3)
WS0-XTDI)
MS =  Green One or more safety
I/O modules :
MS =
(1 Hz) (firmware ≥
V2.00.0)
or
MS =
(firmware V1.xx.0) and
Q1 or Q2 or Q3 or Q4
= Green (1 Hz)
One or more safety
I/O modules :
MS =
(1 Hz) (firmware ≥
V2.00.0)
or
MS =
(firmware V1.xx.0)
and
I1 or I2 or I3 or I4 or I5
or I6 or I7 or I8 =
Green (1 Hz)
83
Diagnostics
Possible error
codes
WS0-XTIO:
0x4701,
0x4702,
Red/green
0x4704,
0x4705.
Red (1 Hz)
WS0-XTIO/
WS0-XTDI:
Red/green 0x4601
Red (1 Hz)
Possible reasons
Short circuit to 24 V or cross circuit in
wiring of safe output Q1...Q4 (whose
LED is flashing).
 Capacitive load exceeded the
allowed maximum value (e.g. by
capacitor for spark quenching).
 Inductive load exceeded the
maximum value allowed
 Internal Hardware failure of WS0-
XTIO module
Short circuit to 0 V in wiring of

safety output Q1...Q4 (whose LED
is flashing).
Power supply on the XTIO module

interrupted briefly
For inputs which are connected to test
output:
 Short circuit to 24 V or cross circuit
in wiring for tested sensors:
a) Short circuit to 24 V or cross
circuit in wiring from X1, X2,...or
X8 to tactile switch or test input
of testable input.
b) Short circuit to 24 V or cross
circuit in wiring from tactile
switch or output of testable
sensor to I1, I2,...or I8.
 Defect testable sensor.
Cable interruption in wiring for

safety mat:
a) Cable interruption in wiring from
X1, X2,...or X8 to safety mat.
b) Cable interruption in wiring from
safety mat to I1, I2,...or I8.
 Defect safety mat.
Possible measures
 Check wiring of all output.
 Check capacitive load.
 Check inductive load.
Replace XTIO module.
To reset the error all outputs of the
effected module have to be turned off
from logic of by turning off related input
signals, e.g. E-stop. Error reset can
take up to 8 seconds. Alternatively
power cycle the CPU module.
 Check wiring of effected input.
 Replace testable sensor.
To reset the error turn off the effected
input (input state Low/Low for
equivalent dual channel inputs,
Low/High for complementary dual
channel inputs) or power cycle the
CPU module.