Chapter 11 Troubleshooting; Checking The Leds - Mitsubishi Electric NZ2MFB2-16A User Manual

11
TROUBLESHOOTING
This chapter describes error contents that may occur while the I/O module is used and those troubleshooting.
11.1

Checking the LEDs

This section describes how to troubleshoot the system by the LEDs.
Determine the status of module error
Error status can be determined by the On/Off status of RUN LED and ERR. LED as follows.
RUN LED ERR. LED
*2
Off On
On On
On Flashing
*1 When multiple errors occur, the error status is displayed in the order of major error > moderate error > minor error.
*2 When the module is failed, the LED may not turn on.
When the PW LED does not turn on
Check item
Is any LED other than the PW LED turned on?
Is the module power supply (24VDC) wired?
Is the module power supply (24VDC) turned on?
Is the voltage of the module power supply (24VDC) within the specified
range?
When the I/O PW LED does not turn on
Check item
Is the external power supply (24VDC) wired?
Is the external power supply (24VDC) turned on?
Is the voltage of the external power supply (24VDC) within the specified
range?
When the RUN LED does not turn on
Check item
Does the voltage of the module power supplied externally reach to the
voltage of the specifications?
Has any hardware failure occurred?
When the D LINK LED turns off
Check item
Has any error occurred?
Is the station-to-station distance 100m or less?
Does the cabling condition (bending radius) meet the specifications?
Does the switching hub normally operate?
Is the IP address of the I/O module duplicated with any of other
devices?
*1
Error type Description
Major error Indicates that the module has stopped operation due to hardware failure.
Moderate error Indicates that the module has stopped control operation due to setting error.
Minor error Indicates that the module has been operating despite the detection of communication
failure or change of switch.
Action
When any LED other than the PW LED turns on, the possible cause is a hardware
failure. Please consult your local Mitsubishi representative.
Wire the module power supply (24VDC).
Turn on the module power supply (24VDC).
Set the voltage value within the range of performance specifications.
Action
Wire the external power supply (24VDC).
Turn on the external power supply (24VDC).
Set the voltage value within the range of performance specifications.
Action
Check that module power supply voltage is within the range of performance
specifications. ( Page 16 Performance Specifications)
After the check, power off and on the module power supply.
If the RUN LED does not turn on even after the module power supply is powered off
and on, the possible cause is a module failure. Please consult your local Mitsubishi
representative.
Action
Determine the error factor by the CC-Link IE Field Network Basic diagnostic window
or LED status of I/O module, and take action.
Change the station-to-station distance to 100m or less.
Refer to the manual for the Ethernet cable used, and correct the bending radius.
• Check that a 100BASE-TX-compliant switching hub is used.
• Check that the power supply of the switching hub is turned on.
IP address of the I/O module must not be duplicated with another device.
11 TROUBLESHOOTING
11.1 Checking the LEDs
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