Omron FQM1-MMA21 Manuel D’Utilisation

The I/O check flowchart is based on the following ladder diagram section,
assuming that the problem is SOL1 does not turn ON.

Start

Return to Start of I/O Check.

Is the output

indicator for CIO 0001.00

normal?

No

Yes

No

No

Yes

Yes

Check the 0001.00 terminal 
voltage with a multimeter.

Yes

No

Tighten terminals screws.

Wire terminals correctly.

(LS1)

CIO 0000.02

CIO 0005.00

(LS1)

CIO 0000.03

CIO 0001.00

SOL1

Wire terminals correctly.

Replace the terminal block 
connector.

Is the voltage normal?

Is the output wiring

correct?

Did the terminal's 

contact fail?

Monitor the ON/OFF status of 
CIO 0001.00 from the CX-
Programmer.

No

Yes

Operation normal?

Replace the Module.

Disconnect external wiring and 
check conduction status, etc.

No

Is the voltage normal?

Yes

Check the SOL1 solenoid.

Input indicators 

for 0000.02 and 0000.03 

normal?

No

Yes

No

Yes

Check voltage at the 0000.02 
and 0000.03 terminals with a 
multimeter.

Is the voltage normal?

No

Yes

Check voltage at the 0000.02 
and 0000.03 terminals with a 
multimeter.

Is the voltage normal?

Are the terminal 

screws loose?

No

Yes

Did the terminal's 

contact fail?

Disconnect external wiring, 
connect a test input, and 
check voltage again.

Is the voltage normal?

No

Yes

Is the input wiring

correct?

Yes

No

Replace the terminal block 
connector.

Replace the Module.

Replace the Module.

Check input devices LS1 and 
LS2.

Yes

No