Troubleshooting By Symptom - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Troubleshooting by Symptom

When the PWR LED does not turn ON
Check item
Check whether the power is supplied.
Whether the FX5-4AD-ADP is attached normally to the CPU module.
When a digital output value cannot be read
Check item
Whether the analog signal cable is connected normally to the FX5-4AD-ADP.
Whether the external equipment is wired correctly.
Whether the offset/gain is set correctly.
Check whether the input range setting is correct.
Whether the "A/D conversion enable/disable setting" is set to "enable" for the
channel to be used.
When the digital output value does not change
Check item
Whether disconnection is detected.
Whether over-scale is detected.
Whether the shift function is working with a proper setting value
When a value is not converted into the expected digital output value
Check item
Check whether the input range setting is correct.
Check whether the offset/gain setting is correct.
Whether the A/D conversion method is set correctly.
Whether the scaling function is set correctly.
Whether the shift function is working with a proper setting value.
When the digital output value is dispersed
Check item
Whether an A/D conversion method other than sampling processing is set.
Action
Check whether the voltage supplied to the CPU module is within the rated
range.
Check the FX5-4AD-ADP attachment status.
Action
Check the signal cables visually, and wire the analog signal cable correctly.
Wire the external equipment correctly to the FX5-4AD-ADP.
• Check whether the shield wire of the channel to be used is grounded.
• Check whether the V+ terminal and I+ terminal are connected to each
other when the current is input.
Check whether the offset/gain is set correctly.
Check whether A/D conversion is executed correctly.
When A/D conversion is executed correctly, set the offset/gain again.
Check the input range setting in the parameter setting of GX Works3.
If the contents of setting are wrong, set the input range again.
Check the "A/D conversion enable/disable setting" for the channel to be used
in the parameter setting of GX Works3, and set "enable" in the parameter of
GX Works3 or in the program.
Action
Remove the cause of disconnection by replacing the analog signal cable, etc.,
and then check the digital output value.
Remove the cause of over-scale, and then check the digital output value.
Set the conversion value shift amount suitable for the system.
Action
Check the input range setting in the parameter setting of GX Works3. If the
contents of setting are wrong, set the input range again.
Check whether the offset/gain is set correctly.
Check whether A/D conversion is executed correctly.
When A/D conversion is executed correctly, set the offset/gain again.
Check the A/D conversion method in the parameter setting of GX Works3. If
the contents of setting are wrong, set the A/D conversion method again.
When the scaling function is used, check the scaling function setting in the
parameter setting of GX Works3. If the contents of setting are wrong, set the
scaling function again.
Set the conversion value shift amount suitable for the system.
Action
Check the A/D conversion method in the parameter setting of GX Works3. Set
the averaging processing to the A/D conversion method, and then check
again for dispersion of the digital output value.
2 FX5-4AD-ADP
59
2.7 Troubleshooting
2