Mitsubishi Electric MELSEC iQ-RJ71C24-R4 - Page 452

450
27 TROUBLESHOOTING
27.1 Checking Module Status
Hardware test
The hardware test is a test to check the memory of C24.
Perform the hardware test according to the procedure described below.
Operating procedure
1. Test mode setting (Page 422 PARAMETER SETTING)
• Set the test mode setting to "Hardware test".
• Configure all of the transmission settings and communication speed setting for the two interfaces according to the
transmission specifications for data communication with a target device.
• Set the CPU module in the STOP state, and write the parameters.
2. Performing hardware test
By restarting or resetting the CPU module, the test starts automatically in approximately one second. The RUN LED flashes
during the test. (Set the CPU module in the STOP state.)
3. Checking results of hardware test
• When the result is normal
The RUN LED turns ON and the ERR LED turns OFF.
• When the result is abnormal
The RUN LED turns ON and the ERR LED turns ON.
4. Completing hardware test
• When the result is normal
Perform an Self-loopback test. (Page 451 Self-loopback test)
Start data communication with the target device according to the following procedure.
 Configure the parameter settings with Engineering tool. (Page 422 PARAMETER SETTING)
 Turn OFF the power for the station with C24, and connect the cable to communicate with the target device.
 Turn ON the power for the station with C24.
• When the result is abnormal
Check error contents on the items below on the "Intelligent Function Module Monitor" screen of Engineering tool.
Check the error descriptions on the screens by bit-decoding the monitored value (16-bit integer). Each bit corresponds to the
following error description.
*1 When an error occurs even after performing the test again, please consult your local Mitsubishi representative.
Buffer memory to be monitored Description when corresponding bit
is ON
Corrective action
Bit position Address
CH1 side: Un\G513 CH2 side: Un\G514
b0 
b1 SIO When interlink
operation is set
Transmission setting
error
Check the parameter setting
and perform the test
again.
*1
Page 422
PARAMETER SETTING
b2 PRO Protocol setting error
b3 P/S When independent
operation is set
Transmission setting
error
b4 C/N Protocol setting error
b5 to b6 
b7 NEU  Test completed 
b8 to b13 
b14  CH2 ERR RAM error Check the module
installation status and
perform the test again.
*1
b15 CH1 ERR  ROM error