Mitsubishi MELSEC-WS0-CPU0 User Manual page 87

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
I1+I2 or I3+I4 or I5+I6
or I7+I8 =
Green (1 Hz)
MS =  Red MS =  Red
MS =  Red MS =
(with firmware ≥
V2.00.0)
MS = MS =  Red
Red (2 Hz)
(with firmware ≥
V2.01.0)
Diagnostics
Possible error
codes
WS0-XTIO/
WS0-XTDI:
Red/green
0x4429 or
0x442A
Red (1 Hz)
CPU module:
0xXXXCXXXX.
Safety I/O
modules:
0xCXXX
(X= any value)
Red (2 Hz) CPU module:
0xXXXCXXXX.
Safety I/O
modules:
0xCXXX
(X= any value)
CPU module:
0xXXXCXXXX.
Safety I/O
modules:
0xCXXX
(X= any value)
Possible reasons
Discrepancy error or sequence error at
dual channel inputs (whose LEDs are
*1
flashing green):
 Cable interruption or short circuit to
0 V at one of both input signals of
the input pair.
 Hardware failure of sensor, e.g. one
of both contacts/outputs is
permanently closed (High) or
opened (Low).
 Defect sensor (one of both signals
does not change to the
corresponding state to the other
input within the configured
discrepancy time.
 Opening or closing of safety door
was too slow so that the 2 contacts
switches (e.g. reed contacts) did not
switch within the configured
discrepancy time.
 Only one of both inputs has caused
the switch off condition and has
changed back to the on condition,
without the other input having
changed at all (sequence error).
 Power supply 0 V at WS0-XTIO
module missing (firmware V1.xx.0
only).
 Internal error in safety I/O module.
 Internal error in CPU module.
Internal error in safety I/O module
(whose MS LED is flashing).
Internal error in CPU module or in the
system.
Chapter 10
Possible measures
 Check wiring of effected input and
check switching capability of both
contacts/outputs of the connected
sensor.
 Check mechanical dependency of
both switches.
 Replace switch/sensor in hardware
installation
To reset the error the effected input
pair has to be Low/Low for equivalent
dual channel inputs and Low/High for
complementary dual channel inputs.
 Check connection of terminal A2 of
WS0-XTIO modules to 0 V of
power supply.
 Check installation for EMC
influence (earthing of DIN mounting
rail,...).
 To reset the error power cycle the
CPU module.
 If the error persists, then replace
modules.
Check installation for EMC

influence (earthing of DIN mounting
rail,...).
 To reset the error power cycle the
CPU module
 If the error persists, then replace
the module whose MS LED is
flashing.
Check installation for EMC

influence (earthing of DIN mounting
rail,...).
 To reset the error power cycle the
CPU module
 If the error persists, then replace
subsequently CPU module and
safety I/O modules
84