Chapter 13 Troubleshooting

(e)The counter input does not function

The CPU operates, but the input data is incorrect

Does it operate as

normal input?

YES

Are pulses that exceed

5 kHz being input?

NO

Are the operating mode

settings correct?

YES

Are the I/O function

settings correct?

YES

Are the various settings valid?

YES

Check the input area

Check the input pulse

Malfunction due to noise

NO

Check the input area

Check the input signal source

Malfunction due to noise

Cable is disconnected

YES

Set the pulse input to 5kHz or less

NO

Set the operating mode for the peripheral devices

Note: The operating mode can only be changed while the CPU is being stopped

NO

Set the I/O functions on devices such as peripheral devices

NO

Turn on the setting enabling request flag ON using peripheral devices

13-12

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Hitachi NJI-350B manual 13-12