13. Troubleshooting
13-33
13.2.2.2 J.NET module troubleshooting
If the ERR LED of the J.NET module is on, follow the instructions in Table 13-6 to troubleshoot the
problem. If the ERR LED is off, troubleshoot the problem according to the following instructions.
(1) Troubleshooting from the transmission LED (TX) and the reception LED (RX)
Check whether the transmission LED (TX) and reception LED (RX) of the J.NET module are on or
off, and then follow the instructions in Table 13-16 to troubleshoot the problem.
Table 13-16 Troubleshooting from the transmission LED (TX) and the reception LED (RX)
LED status
Check
Corrective action
Both the TX and RX
LEDs are off.
Is the system information or NET information set
up correctly?
Set up the information correctly.
Have the MODU No. switch and BIT RATE
switch been set correctly?
Correct the settings.
Is the RI/O STOP input of the RI/O-IF module
turned on?
Turn off the RI/O STOP input.
The TX LED is
blinking, and the RX
LED is off.
Are the cables connected correctly?
Connect the cables correctly.
Is the termination resistor connected correctly?
Connect the termination resistor
correctly.
Is the slave device power turned on?
Turn on the slave device power.
Are the NET information settings appropriate for
the slave device?
Set up the NET information settings
according to the slave device
specifications.
Both the TX and RX
LEDs are blinking.
Are the cables connected correctly?
Connect the cables correctly.
Is the termination resistor connected correctly?
Connect the termination resistor
correctly.
Are the NET information settings appropriate for
the slave device?
Set up the NET information settings
according to the slave device
specifications.
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