1 OVERVIEW

MELSEC-Q

 

1 OVERVIEW

1

This manual describes the specifications for the QJ71C24N, QJ71C24N-R2,

 

QJ71C24N-R4, QJ71C24, QJ71C24-R2 serial communication module (hereinafter

 

 

referred to as "Q series C24"), as well as the procedures prior to starting the operation,

 

maintenance, inspection, data communication methods for use with external devices

and troubleshooting.

When applying the following program examples to the actual system, make sure to examine the applicability and confirm that it will not cause system control problems.

1.1 Overview of the Serial Communication Module

The Q series C24 is a module that connects the Q series PLC CPU and an external device using an RS-232 or RS-422/485 line for serial communication, in order to achieve the data communication described below.

By using a modem/terminal adapter, a public line (analog/digital) can be used for data communication with a remote location.

• PLC data collection/change from the external devices

(See the MELSEC Communication Protocol Reference Manual.)

•PLC monitoring and control from the external devices (See Chapter 2 of the User's Manual (Application).)

•Data receiving and sending in any formats that conform to the external device specifications (See (2) and (3) of Section 1.2.)

•Collection of measured data from a measuring device (See (2) of Section 1.2.)

•Operation of a PLC CPU that is connected to a personal computer (hereinafter abbreviated as PC) installed with GX Developer (SW4D5C-GPPW-E or later, hereinafter abbreviated as GX Developer). (See the GX Developer Manual.)

•Collection of measured data

• Collection of read data

QJ71C24-R2

RUN

ERR.

NEU

NEU

CH.1 SD

SD CH.2

RD

RD

CH. 1

•PLC data collection/change

•PLC monitoring and control from an external device

•Data receiving and sending in any formats that conform to the external device specifications

•GX Developer

•File writing/reading

•Device monitoring/testing

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Being a convenient means of connection among different devices (PCs, display devices, printers, etc.), the serial communication line is the most widely used medium on the market today.

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