10 TROUBLESHOOTING
10.2 Checking the LEDs
109
10
When the LINK LED turns off
When the LINK LED turns off, check the following items.
When the I/O LED flashes
When the I/O LED flashes, check the following items.
When the I/O PW LED does not turn on
When the I/O PW LED does not turn on, check the following items.
Check item
Action
Are Ethernet cables used compliant with the relevant standard?
Replace the cable with an Ethernet cable compliant with the relevant
standard.
User's manual for the master station used
Is the station-to-station distance 100m or less?
Change the station-to-station distance to 100m or less.
Is any Ethernet cable disconnected?
Replace the Ethernet cable.
Does the switching hub in use normally operate?
• Check that the power supply of the switching hub is turned on.
• Check that the switching hub compliant with the specifications of the master
module in use is used. (
User's manual for the master station used)
• Disconnect the Ethernet cables and then reconnect them.
• Power off and on the switching hub.
Are other stations connected to the safety remote I/O module normally
operating?
• Check that the power supplies of the other stations are turned on.
• Disconnect the Ethernet cables and then reconnect them.
• Power off and on the switching hub.
Is a device connected to the PORT able to operate with the communication
speed of the safety remote I/O module?
Connect a device that can communicate at the communication speed set in
the safety remote I/O module.
When the communication speed of the safety remote I/O module is set to
100Mbps, is auto-negotiation of the connected device enabled?
Enable auto-negotiation of the connected device. Alternatively, connect a
device with auto-negotiation enabled.
Check item
Action
Has any error related to safety I/O occurred when "I/O LED indication at error
occurrence" is "1: Indication of error point"?
Identify the error factor of the safety remote I/O module with the engineering
tool and take corrective actions. (
Page 103 CC-Link IE TSN/CC-Link IE
Check item
Action
Is the external power supply turned on?
• Keep the external power supply voltage within the range of performance
specifications. (
Page 19 Performance Specifications)
• After performing the above action, power off and on the module power
supply (24VDC). If the I/O PW LED does not turn on even after the module
power supply (24VDC) is powered off and on, the possible cause is a safety
remote I/O module failure. Please consult your local Mitsubishi
representative.
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