10 TROUBLESHOOTING

MELSEC-Q

Error code

 

 

 

 

 

 

 

Protocol

 

Error

 

 

Signal

 

 

 

Non

 

(Hexa-

 

Error Contents

 

Corrective action

 

Bidire-

 

name

 

MC

Proce-

decimal)

 

 

 

 

 

ctional

 

 

 

 

 

 

 

 

dure

 

 

 

 

 

 

• Match the Q series C24 and

 

 

 

 

 

 

 

 

 

external device settings.

 

 

 

 

 

 

 

 

• Clear the error information

 

 

 

 

 

 

 

 

 

according to the error

 

 

 

 

 

 

 

 

 

information initialization request

 

 

 

 

 

• Data does not match the parity bit setting.

 

 

(YE/YF).

 

 

 

 

 

 

 

In addition, when

 

 

 

 

 

• A malfunction occurred in the network because the

 

 

 

 

 

 

 

 

 

communicating data with the

 

 

 

 

 

 

power source of the partner station was on or off.

 

 

 

 

 

7F69H

Parity error

 

P/S

 

non procedure protocol, execute

 

 

 

•

Noise occurs in the network.

 

 

 

 

 

the INPUT instruction, and read

 

 

 

 

 

 

 

 

 

 

 

 

• When the multidrop was connected, data was

 

 

 

 

 

 

 

 

 

and discard the unnecessary

 

 

 

 

 

 

transmitted simultaneously by multiple devices.

 

 

 

 

 

 

 

 

 

 

data.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

•

Measure the noise.

 

 

 

 

 

 

 

 

• When connecting the multidrop,

 

 

 

 

 

 

 

 

 

remove the interlock so that

 

 

 

 

 

 

 

 

 

data will not be transmitted

 

 

 

 

 

 

 

 

 

simultaneously by multiple

 

 

 

 

 

 

 

 

 

devices.

 

 

 

 

 

 

 

 

• Use DTR and DC control and

 

 

 

 

 

 

 

 

 

perform data communications

 

 

 

 

 

 

 

 

 

so that the buffer does not

 

 

 

 

 

•

OS receive buffer overflowed and receive data was

 

 

become full. (Perform RS ⋅ CS

 

 

 

7F6AH

Buffer full error

SIO

 

control when the modem

 

 

 

 

skipped.

 

 

 

 

 

 

 

 

 

function is used.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• If the Read Request signal was

 

 

 

 

 

 

 

 

 

turned ON, execute read

 

 

 

 

 

 

 

 

 

immediately.

 

 

 

 

 

 

 

 

• Recheck the CD signal control

 

 

 

 

CD signal control

•

Data was received when CD signal is OFF when

CHn

 

of the external device.

 

 

 

7F6BH

 

(Send while the CD signal is ON.)

 

 

 

error

 

"CD terminal check enabled" was designated.

ERR.

 

 

 

 

 

 

•

Set "no CD terminal checking"

 

 

 

 

 

 

 

 

 

and perform communication.

 

 

 

 

 

 

Data cannot be sent because the line is not

CHn

• Transmit data after line

 

 

 

7F6CH

Transmission error

•

 

connection processing on the

 

 

 

 

 

 

connected.

ERR.

 

interface side that uses the

 

 

 

 

 

 

 

 

 

modem function.

 

 

 

7F91H

 

 

 

 

 

 

 

 

 

to

 

 

 

 

 

 

 

 

 

7F96H

 

 

 

 

 

 

 

 

 

7F98H

 

 

 

 

 

 

 

 

 

to

 

 

 

 

 

 

 

 

 

7F9AH

 

 

 

 

 

 

 

 

 

7F9DH

 

 

 

 

 

 

 

 

 

7F9EH

 

 

 

 

 

 

 

 

 

7FA0H

 

 

 

 

 

 

 

 

 

to

 

 

 

 

 

 

 

 

 

7FA3H

 

 

 

 

 

 

 

 

 

7FA8H

 

 

 

 

 

 

 

 

 

7FAAH

System error

•

The OS of the Q series C24 detected some error.

—

(

1)

 

 

 

to

 

 

 

 

 

 

 

 

 

 

 

 

7FADH

 

 

 

 

 

 

 

 

 

7FAFH

 

 

 

 

 

 

 

 

 

to

 

 

 

 

 

 

 

 

 

7FB2H

 

 

 

 

 

 

 

 

 

7FB5H

 

 

 

 

 

 

 

 

 

7FB6H

 

 

 

 

 

 

 

 

 

7FB8H

 

 

 

 

 

 

 

 

 

to

 

 

 

 

 

 

 

 

 

7FBCH

 

 

 

 

 

 

 

 

 

7FC0H

 

 

 

 

 

 

 

 

 

to

 

 

 

 

 

 

 

 

 

7FC4H

 

 

 

 

 

 

 

 

 

10 - 21

10 - 21