Mitsubishi-electric QJ71C24N Manuel d'utilisateur télécharger pdf (Page 34)

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MELSEC-Q

1 OVERVIEW

(9) Remote password check function

(Details are explained in the User's Manual (Application) and the Reference Manual.)

(a) The remote password check function of the Q series C24 prevents users at

a remote location to access QCPUs illegally using the modem function of the

Q series C24.

(The remote password is checked in the following forms of data communication)

• Communication using the MC protocol

(The remote password check is not carried out in data communication

using the non procedure/bidirectional protocols.)

• Access to the PLC through GX Developer

The remote password function is one of the QCPU functions and used for

preventing illegal access to the QCPU by other users.

Use GX Developer to set a remote password for the QCPU in order to

activate the remote password function of the QCPU.

(b) If the Q series C24 is specified in the parameters of a QCPU as being

subject to the remote password check, the remote password can be

unlocked (canceled) using either one of the methods below, to allow data

communication from the external device. It is necessary to connect a line to

the modem first.

• When communicating using the MC protocol

Use the dedicated command for communication using the MC protocol to

unlock the remote password from the external device.

• When accessing the PLC through GX Developer

Unlock the remote password using GX Developer at the start of online

operation.

The remote password is automatically locked by disconnecting the line to

the modem.

Accessing

external device

Modem

Dialup line

Modem

QCPU

Q series C24

Communication using the MC protocol

Communication through GX Developer.

GX Develo

Set the parameters to make

the Q series C24 as a subject to

the remote password check.

Remote

password

Remote

password

check

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Mitsubishi-electric QJ71C24N Manuel d'utilisateur Page 34

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