Troubleshooting By Symptom - Mitsubishi Electric NZ2GN2S1-16D User Manual

11.4

Troubleshooting by Symptom

Perform troubleshooting by symptom when the I/O module does not operate properly even with no error. If an error occurs in
the I/O module, identify the cause of the error using the engineering tool.
When the ON/OFF status of an external input cannot be read
When the ON/OFF status of an external input cannot be read, check the following items.
Check item
Is the corresponding LED (X0 LED to X1F LED)
of the I/O module on when an external input
device is on?
When the LEDs from X0 LED to X1F LED are
turned on, does the corresponding RX device
turn on?
On the network configuration settings, has the
network synchronous communication setting
(synchronous/asynchronous) or the setting for
function setting switch 6 or function setting
switch 7 been changed?
Is the inter-module synchronous interrupt
program created when MELSEC iQ-R series
modules use the CC-Link IE Field Network
synchronous communication function together
with the inter-module synchronization function?
Is there any problem with other equipment such
as the master station and connected devices?
Action
If the LED does not turn on, there is a problem on the input wiring.
Check the wiring confirming that the input wiring is not disconnected or short-circuited, or the voltage of the
input signal is correct.
For the rated input voltage, check the Rated input voltage column of each I/O module specifications.
Page 21 Input module
Page 79 I/O combined module
Refer to the following as well.
Page 195 Troubleshooting for input circuit
If the LED does not turn on even after the input wiring is corrected, the possible cause is an I/O module
failure. Please consult your local Mitsubishi representative.
If the RX device does not turn on, check and correct the refresh parameter so that the refresh device setting
matches the corresponding setting in the program. For the refresh parameter setting, refer to the following.
 User's manual for the master station used
When the network synchronous communication setting or the setting for function setting switch 6 or
function setting switch 7 has been changed, turn off and on the power supply, or perform remote reset.
Create the inter-module synchronous interrupt program when MELSEC iQ-R series modules use the CC-
Link IE Field Network synchronous communication function together with the inter-module synchronization
function.
For the inter-module synchronous interrupt program, refer to the following.
 MELSEC iQ-R Inter-Module Synchronization Function Reference Manual
If there is no problem with other equipment, the possible cause is an I/O module failure. Please consult
your local Mitsubishi representative.
11 TROUBLESHOOTING
11.4 Troubleshooting by Symptom
11
193