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CHAPTER 11 TROUBLESHOOTING
11
11.4 Checking the LEDs
(8) When the LINK LED turns off
If link-up processing is repeated due to a condition of a device on the line, it may take a longer time for the LINK LED to turn
on. This phenomenon may be eliminated by changing the module PORT into which the Ethernet cable is connected
(example: PORT1 → PORT2). For the wiring of Ethernet cable, refer to the following.
Page 60, Section 6.5
(9) When the ERR. LED turns on
(10)When the ALM LED turns on or flashes
(a) When ALM LED turns on
(b) When the ALM LED flashes
Check item Action
Are Ethernet cables normal?
• Check if 1000BASE-T-compliant Ethernet cables are used. ( User's manual for
the master/local module used)
• Check if the station-to-station distance is 100m or less.
• Check if the Ethernet cables are not disconnected.
Do the switching hub and other stations used in the system operate
normally?
Check if the power supplies of the switching hub and other stations are turned on.
Check item Action
Does any error occur?
Identify the error factor of the A/D converter module with the engineering tool to take
the corrective action. ( Page 168, Section 11.1)
Check item Action
Has an alert been issued in the main A/D converter module? Check Alert output flag (RWrB).
Has an alert been issued in the extension A/D converter module? Check Alert output flag (RWr1B).
Has an alert been issued in the extension D/A converter module? Check Alert output flag (RWr1A).
Check item Action
Has an input signal error occurred in the main A/D converter module? Check Input signal error detection flag (RWrA).
Has an input signal error occurred in the extension A/D converter
module?
Check Input signal error detection flag (RWr1A).
Has a digital value out-of-range error occurred in the extension D/A
converter module?
Check Setting value check code (RWr12 to RWr15) of the corresponding channels.
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