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3 TROUBLESHOOTING
3.1 Checking with LED
3 TROUBLESHOOTING
This chapter describes troubleshooting of when the Ethernet function is used.
3.1 Checking with LED
This section describes troubleshooting using LED.
Error status can be determined by status of the RUN LED and the ERR LED.
*1 When multiple errors occur, the error status is displayed in the order of major, moderate, and minor.
For the RJ71EN71 or RnENCPU, whether the error occurs in the P1 or P2 can be checked with P ERR LED.
When the RUN LED or READY LED turns off
When the READY LED of the CPU module turns off after power-on, refer to the troubleshooting of the CPU module. (
MELSEC iQ-R CPU Module User's Manual (Application))
When the RUN LED of the RJ71EN71 or RnENCPU turns off, check the following.
If the above action does not solve the problem, perform the module communication test to check for hardware failure. (
Page 284 Module communication test)
When the ERROR LED or ERR LED turns on or is flashing
When the ERROR LED of the CPU module turns on or is flashing, perform the module diagnostics of the CPU module.
[Diagnostics] [Module Diagnostics (CPU Diagnostics)]
When the ERR LED of the RJ71EN71 or RnENCPU turns on or is flashing, identify the error cause using the engineering tool.
( Page 282 Checking the Module Status)
If the above action does not solve the problem, perform the module communication test to check for hardware failure. (
Page 284 Module communication test)
RUN LED ERR LED Error status
*1
Description
Off On, flashing Major error An error such as hardware failure or memory failure. The module stops operating.
On Flashing Moderate error An error, such as parameter error, which affect module operation. The module stops operating.
On On Minor error An error such as communication failure. The module continues operating.
Check item Action
Is the Ethernet-equipped module mounted correctly? Securely mount the Ethernet-equipped module on the base unit.
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