Troubleshooting - Mitsubishi Electric NZ2FTGN User Manual

Troubleshooting

If problems occur on the NZ2FT-C24, perform the following.
Checking with LEDs
■When the module status LED turns on in red
Check the following items in order from the top.
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?
Is the I/O module mounted properly?
■When the channel status LEDs 1.1, 1.2, and 3.1 to 3.4 turn off
Check the following items.
Check item
Check the setting of the parameter "Operating
mode".
If the parameter "Data bits" is "7 bit", is the
parameter "Parity" set to "None"?
■When the channel status LEDs 4.1 and 4.3 turn off
Check the following items in order from the top.
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?
If the problem persists even after checking the above, acquire the service file, and please consult your local Mitsubishi
representative. ( Page 88 Acquisition of the service file)
21 SERIAL COMMUNICATION MODULE
576
21.1 NZ2FT-C24
Action
Wire the external power supply (24VDC).
Turn on the external power supply (24VDC).
Set the voltage of the external power supply within the range of performance specifications.
Mount the I/O module again by pressing it to the coupler until it clicks.
Action
Set the parameter "Operating mode" to the same setting as the connected external device.
If the parameter "Data bits" is "7 bit", set the parameter "Parity" to "Even" or "Odd".
Action
Wire the external power supply (24VDC).
Turn on the external power supply (24VDC).
Set the voltage of the external power supply within the range of performance specifications.