Chapter 4 Troubleshooting; Checking With Led - Mitsubishi Electric MELSEC iQ-R Series User Manual

4
TROUBLESHOOTING
This section describes troubleshooting for the RJ71LP21-25.
4.1

Checking with LED

This section describes troubleshooting using LED.
Error status can be determined by status of the RUN LED and the ERR LED.
RUN LED ERR LED
Off On, flashing
On Flashing
On On
*1 When multiple errors occur, the error status is displayed in the order of major, moderate, and minor.
When the RUN LED turns off
When the RUN LED turns off after powering on the RJ71LP21-25, check the following.
Check item
Has any error occurred in the result of the hardware test?
Is the RJ71LP21-25 mounted correctly?
When the ERR LED turns on or is flashing
When the ERR LED turns on or is flashing, check the following.
Check item
Does any error occur in the module diagnostics?
Does any error occur in the MELSECNET diagnostics?
If the above action does not solve the problem, perform the self-diagnostics test to check for hardware failure. (Page 95
Self-diagnostics test)
When the T PASS LED turns on and off in an unstable condition
When the T PASS LED turns on and off in an unstable condition, check the following.
Check item
Does the communication cable used conform to the standard?
Does the station-to-station distance meet the specifications?
Is any communication cable disconnected?
Is the connector about to come out?
Is the reserved station set for the control station?
Is the set station number greater than the number of connected
modules?
4 TROUBLESHOOTING
90
4.1 Checking with LED
*1
Error status Description
Major error An error such as hardware failure or memory failure. The module stops operating.
Moderate error Although an error, such as a parameter error, which affects module operation has
occurred, the module continues operation.
Minor error An error such as communication failure. The module continues operating.
Action
The possible cause is a hardware failure. Replace the module.
Securely mount the RJ71LP21-25 on the base unit.
Action
Follow the instruction displayed on the window.
• Correct "Network Range Assignment" in "Required Settings" in accordance with the
station actually connected.
• When there is a disconnected station, perform troubleshooting for when the D LINK LED
turns off. ( Page 91 When the D LINK LED turns off)
Action
Replace the communication cable with one conforming to the standard.
Set the station-to-station distance within range.
Replace the communication cable.
Firmly insert the connector.
Remove the reserved station specified in the control station setting.
Correct the station number so that it is within the number of connected modules.