FP
Σ
12.2 Troubleshooting
12 - 7
12.2.2
If the ERROR/ALARM LED Lights
Condition: The system watchdog timer has been activated and the operation of
PLC has been stopped.
Procedure 1
Set the mode selector of PLC from RUN to PROG. mode and turn the power off and then
on.
- If the ERROR/ALARM LED is turned on again, there is probably an abnormality in
the FP
Σ
control unit. Please contact your dealer.
- If the ERROR/ALARM LED is flashed, go to page 12 - 5.
Procedure 2
Set the mode selector from PROG. to RUN mode.
- If the ERROR/ALARM LED is turned on, the program execution time is too long.
Check the program, referring the following:
Check if instructions such as
“Jump”
or
“LOOP”
are programmed in such a way
that a scan can never finish.
Check that interrupt instructions are executed in succession.
12.2.3
If None of the LEDs Light
Procedure 1
Check wiring of power supply.
Procedure 2
Check if the power supplied to the FP
Σ
control unit is in the range of the rating.
- Be sure to check the fluctuation in the power supply.
Procedure 3
Disconnect the power supply wiring to the other devices if the power supplied to the FP
Σ
control unit is shared with them.
- If the LED on the control unit turn on at this moment, increase the capacity of the
power supply or prepare another power supply for other devices.
Содержание FP Series
Страница 15: ...FP Functions and Restrictions of the Unit 1 2...
Страница 25: ...FP Specifications and Functions of Control Unit 2 2...
Страница 37: ...FP Expansion 3 2...
Страница 44: ...Chapter 4 I O Allocation 4 1 I O Allocation 4 3...
Страница 45: ...FP I O Allocation 4 2...
Страница 51: ...FP Installation and Wiring 5 2...
Страница 77: ...FP High speed Counter and Pulse Output Functions 6 2...
Страница 133: ...FP High speed Counter and Pulse Output Functions 6 58...
Страница 135: ...FP Communication Cassette 7 2...
Страница 147: ...FP Communication Function 1 Computer Link 8 2...
Страница 169: ...FP Communication Function 2 General purpose Serial Communication 9 2...
Страница 205: ...FP Communication Function 2 General purpose Serial Communication 9 38...
Страница 207: ...FP Communication Function 3 PLC Link Function 10 2...
Страница 232: ...Chapter 11 Other Functions 11 1 Analog Potentiometer 11 3 11 2 Clock Calendar Function 11 4...
Страница 233: ...FP Other Functions 11 2...
Страница 238: ...Chapter 12 Self Diagnostic and Troubleshooting 12 1 Self Diagnostic Function 12 3 12 2 Troubleshooting 12 5...
Страница 239: ...FP Self Diagnostic and Troubleshooting 12 2...
Страница 249: ...FP Self Diagnostic and Troubleshooting 12 12...
Страница 251: ...FP Specifications 13 2...
Страница 323: ...Index FP I 4...
Страница 325: ...FP Record of changes R 2...