Mitsubishi-electric QJ71C24N Manuel d'utilisateur télécharger pdf (Page 284)

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MELSEC-Q

10 TROUBLESHOOTING

10.3.5 Troubleshooting when communication error "NAK" generates

Symptom Cause Corrective action MC

Bidirectional

Non

procedure

• See section that

describes the

communication error

signal ("C/N", "P/S",

"PRO", "SIO") that are

turned on

simultaneously when the

"NAK" signal is turned

on.

• Take corrective action corresponding to the

contents of the error.

Note

Since the error code is added to "NAK" and is transmitted from the Q series C24 to the

external device when the "NAK" signal is turned on, take the corrective action described in

the error code table (see Section 10.2).

Since the error code added when "NAK" is transmitted is stored to the Q series C24 buffer

memory shown below, it can also be checked at the Q series C24.

Error code storage buffer memory address

CH1 side 25A

CH2 side 26A

• Communication error

signal "NAK" turned on.

10.3.6 Troubleshooting when communication error "C/N" generates

Symptom Cause Corrective action MC

Bidirectional

Non

procedure

• The Q series C24

cannot be installed in

the CPU.

• Change to a CPU to which the Q series C24

can be installed.

• PLC No. designated

local station (FF), or a

station other than a

station No. set with the

network parameters.

• Change the PLC No. to local station (FF), or a

station No. set with the network parameter and

restart data communications.

• Communication error

signal "C/N" turned on.

• Routing parameters

between CPU with the Q

series C24 loaded and

communications

destination CPU are not

set.

• Check the routing parameters and set them up

to the communications destination CPU.

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Mitsubishi-electric QJ71C24N Manuel d'utilisateur Page 284

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