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14 TROUBLESHOOTING
14.1 Troubleshooting Procedure
14 TROUBLESHOOTING
This chapter describes details of error occurred by using the Simple Motion module and troubleshooting.
14.1 Troubleshooting Procedure
When a trouble occurs, execute the troubleshooting in the order shown below.
1. Check that each module is mounted correctly.
(MELSEC iQ-R Module Configuration Manual)
2. Check the LEDs of the power supply module and CPU module.
(MELSEC iQ-R CPU Module User's Manual (Startup))
3. Check the LED status of each module to confirm whether an error does not occur in a module. (Page 574
Troubleshooting using the LEDs)
4. Check whether an error does not occur in a module using the module diagnostics of an engineering tool. (Page 576
Troubleshooting using the module status)
Troubleshooting using the LEDs
Primary diagnostics can be executed without the engineering tool by checking the status of the LED display, so that the range
of the trouble cause can be reduced.
The status of the Simple Motion module can be checked by the RUN LED and ERR LED. The following shows the
correspondence relation between each LED and status of the Simple Motion module.
: OFF, : ON, ●: Flashing
RD77MS status LED display Description Remedy
Normal operation RUN
ERR
AX1
AX2
AX3
AX4
The axes stopped
The axes on standby
AX1-8
*1
AX1-16
*1
RUN
ERR
AX1
AX2
AX3
AX4
The axis in operation Turned ON from the positioning start until the axis stops caused by
completion, stop, or an error. (One-to-one correspondence with the BUSY
signal.)
AX1-8
*2
AX1-16
*2
Operation failure RUN
ERR
AX1 ●
AX2
AX3
AX4
Minor error Check the error code on the module diagnosis or event history using the
engineering tool, and take a measure against the error referring to the list
of error codes.
AX1-8 ●
*3
AX1-16 ●
*3
RUN
ERR ●
AX1
AX2
AX3
AX4
Moderate error
Watchdog timer error
If the RUN LED is not ON after the power is turned ON from OFF, the
module might be faulty. Therefore, it is required to exchange the module.
AX1-8
AX1-16
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