1 OVERVIEW

1.3 About Added/Changed Functions in Function Version B

MELSEC-Q

The table below lists the functions that have been added or changed in the Q series C24 of function version B.

See Section 2.6 for the function version, serial NO. and software version of products (CPU module, GX Developer, GX Configurator-SC) related to the Q series C24 which can use added/changed functions.

See Appendix 1.1 concerning a comparison of functions in the different Q series C24 function versions.

Function

QJ71C24N

QJ71C24

Outline of function

Reference section

(-R2/R4)

(-R2)

 

 

 

Simultaneous connection of

 

 

This function allows access to the PLC from a PC with GX Developer and a

Section 1.2 of

 

 

GOT connected to two different interfaces of the Q series C24 at the same

User’s Manual

GX Developer and GOT

 

 

 

 

time.

(Basic)

 

 

 

Control of RS and DTR

 

 

This function allows the control of the on or off state of the RS and DTR

Remark of section

signal states

 

 

signals with the PLC program.

3.2.1

Support for 230,400 bps

 

 

This function allows data communication with an external device at a

Chapter 4 of

 

 

transmission speed of 230,400 bps.

 

 

 

User’s Manual

Data transmission/reception

 

 

This function allows data communication with an external device at a

 

 

(Basic)

at low speed

 

 

transmission speed of 50 bps.

 

 

 

Clearing reception data by a

 

 

This function allows clearing reception data using the CSET instruction

Chapter 6, Section

 

 

during data communication using the non procedure protocol.

9.8 of User’s

dedicated instruction

 

 

 

 

It is possible to clear the data even when data is being transmitted.

Manual (Basic)

 

 

 

Transmission of the PLC

 

 

When the PLC CPU monitoring function is active, this function sends the

Chapter 2 of

CPU monitoring information

 

 

 

 

monitoring information of the PLC CPU to the external device through the

User’s Manual

through combined use of the

 

 

 

 

modem.

(Application)

modem function

 

 

 

 

 

 

 

 

 

This function allows data communication after the external device

 

 

 

 

completes the unlock processing of the remote password set at a QCPU. It

Chapter 3 of

 

 

 

is executed when the QCPU is accessed from a remote location using the

User’s Manual

Remote password check

 

 

modem function of the Q series C24 in the following forms of data

(Application)

 

 

 

communication:

Section 3.18 of

 

 

 

• Communication using the MC protocol

Reference Manual

 

 

 

• Communication using GX Developer

 

Automatic initialization for

 

 

Initializes the modem automatically when Q Series C24 starts up.

 

modem

 

 

 

 

 

 

Chapter 3 of the

 

 

 

After line connection from the GX Developer, access to the QCPU from the

 

 

 

User’s Manual

 

 

 

GX Developer is made possible through line reconnection from the Q Series

Callback

 

 

(Application)

 

 

C24 (callback). Transmission costs after line connection from the Q Series

 

 

 

 

 

 

 

C24 side are borne by the Q Series C24 side.

 

Addition of non reception

 

 

This function allows messages to be received in the non reception protocol

Chapter 6 of

monitoring time format in

 

 

by time-out in non reception monitoring time (timer 0) if the received

User’s Manual

non procedure protocol

 

 

complete code and received data count have been not determined.

(Application)

Transmission control

 

 

This function allows the designation of the available capacity of the OS area

Chapter 7 of

start/end free area

 

 

that notifies the data reception failure at the time of transmission control

User’s Manual

designation

 

 

(DTR/DSR signal control and DC code control).

(Application)

Addition of changeable data

 

 

 

 

to the user frame

 

 

These functions allow the following codes to be registered as the

Chapter 9 of

(05H, 0BH, 11H, 17H)

 

 

changeable data of user frames for data communication.

 

 

User’s Manual

Addition of changeable data

 

 

• Horizontal parity code

 

 

(Application)

to the user frame

 

 

• Sum check code of two’s-complement number

 

 

 

(04H, 0AH, E5H, EBH)

 

 

 

 

 

 

 

This function allows reception of a message consisting of the head frame

 

Adding a reception function

 

 

and any data field when receiving data by specifying the head frame.

Chapter 11 of

 

 

The data length of the data field can be specified freely for each

through the use of user

 

 

User’s Manual

 

 

combination of user frames for reception set by the user.

frames

 

 

(Application)

 

 

(Receiving 1 byte providing ACK/NAK only is also possible by setting the

 

 

 

 

 

 

 

data length of the data field to “0.”)

 

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