1 OVERVIEW

1.2 Features of the Serial Communication Module

MELSEC-Q

The following describes the features of the Q series C24.

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(1)Data communication based on the MELSEC communication protocol (hereinafter referred to as the MC protocol)

(Details are explained in the MELSEC Communication Protocol Reference Manual.)

(a)External devices can read/write the PLC device data and sequence programs, and can monitor PLC equipment status.

With the exception of the on-demand function described below, the PLC does not require a sequence program because the PLC sends and receives data based solely on commands from external devices.

(b)Using the on-demand function, data can be sent from the PLC CPU to the external devices in each frame format of the MC protocol.

(c)Data communication can be performed using a program at the external device side that has been created for communicating data with conventional A/QnA series computer link module/serial communication modules.

(d)If the external device is a PC running one of the basic operation systems below, it is possible to create a communication program for the external device without considering the detailed MC protocol (transmission/reception procedures) using one of the following separately sold communication support tools.

(Supported basic operation systems)

•Microsoft® Windows® 95 Operating System

•Microsoft® Windows® 98 Operating System

•Microsoft® Windows NT® Workstation Operating System Version 4.0

•Microsoft® Windows® Millennium Edition Operating System

•Microsoft® Windows® 2000 Professional Operating System

•Microsoft® Windows® XP Professional Operating System

•Microsoft® Windows® XP Home Edition Operating System

Depending on the version of MX Component used, different operating systems are supported.

See the manual of MX Component for the details. (Separately sold communication support tools)

•MX Component (SW0D5C-ACT-E or later, hereinafter abbreviated as MX Component)

See Appendix 7 for the overview of MX Component.

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