User`s manual

CHAPTER 1 OVERVIEW

1.1 Overview

(6) Sending/receiving data in a message format tailored to the external device

( Page 220, CHAPTER 9 to Page 252, CHAPTER 11)

(a) By preregistering the data arrangement (user frames) of the messages to be sent

and received by the external device, to the Q series C24, the following data

communications can be performed using registered frames.

• MC protocol: Data transmission from the programmable controller CPU to the external device using the

on-demand function

• Non procedure protocol: Data communication between the programmable controller CPU and the external

device

(b) For example, multiple first frames and last frames (called user frames) with the

definition shown in the diagram below can be preregistered in the Q series C24.

When sending data to the external device, the data that is arranged as shown in the

diagram below can be sent by designating the preregistered user frame numbers

and arbitrary data. When receiving data from the external device, by setting the

preregistered user frame numbers for reception at the startup of the Q series C24,

the arbitrary data section can be read to the programmable controller CPU when the

message with the registered content is received.

• Before sending data, the Q series C24 adds the first frame and last frame to arbitrary data. When data is

received, the arbitrary data section is stored in the buffer memory as receive data.

device can be preregistered to the Q series C24 flash ROM.

ENQ

CR LF

First frame

Last frame

Password

Destination

station number

Self-station

number

Arbitrary data