Run Led Turns Off; Err Led Flashes - Mitsubishi Electric MELSEC iQ-R Series User Manual

RUN LED turns OFF

Symptom Cause
RUN LED on C24 turns OFF The module is not mounted
properly.
Power module 5 VDC
consumption current is
insufficient.
Extraneous noise causes
abnormal operation of C24.

ERR LED flashes

Symptom Cause
ERR LED flashes. The communication protocol
setting or transmission setting
is incorrect.
The parameter settings are
incorrect.
The protocol setting data
stored in the CPU module is
not for MELSEC iQ-R series
C24.
• Remarks
The error code when ERR LED flashes is stored in the buffer memory shown below.
Error factor
Parameter setting error
Parameter error
(Module parameter)
Corrective action
• Mount the C24 on the base unit properly.
• Calculate the 5 VDC consumption current of each mounted
module. If the current capacity is insufficient, review power
module selection.
• Review the wiring so that the shield is single-point
grounded.
• When ground is used with other devices, ground the C24
independently.
Corrective action
• Read the error code from the buffer memory, and check the
error contents and change to the correct setting.
• Review the parameter settings with Engineering tool. Then,
write the parameter settings to the CPU module, and reset it.
• Review each settings for the parameters set in the buffer
memory, and turn ON the 'CH mode switching request'
(Y2/Y9). For more details on 'CH mode switching request',
refer to the following section.
(Page 380 I/O Signals for Handshake with CPU Module
and Buffer Memory)
• Write the protocol setting data for MELSEC iQ-R series C24
to the CPU module.
Error code storage buffer memory
Address
CH1
Un\G515
Un\G20224 to 20231
CH2
27.3 Troubleshooting by Symptom
MC Non Bi Pd
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MC Non Bi Pd
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Name
Parameter setting error, mode
switching error status
Error address storage area
27 TROUBLESHOOTING
463
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