Specifications

A Series Communication Modules

RS422 Multidrop link (1:32)

RS232C

AJ71C24-S8

Personal computer,etc.

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A computer interface module for linking to computers and other intelligent devices

The AJ71UC24 computer interface modules allow external

intelligent devices such as computers, to communicate with

the PLC CPU. Sequence programs, bit devices, word

devices, parameters etc. can be monitored or written to

using serial communications which conform to RS232C and

RS422 standards. Multi-drop systems can be configured

using these modules for linking up to 32 PLC stations and

allowing access to all 32 from one centralized point. Each

module can operate in either one of four fixed protocol

communications modes or in no protocol mode. Each has

its own built-in buffer memory for the reading and writing

of data.

Part number AJ71UC24

Applicable A Series PLC AnU, AnA and AnN Series

Interface 1 × RS232C channel , 1 × RS422 channel

Transmission system Half duplex communication system, dedicated protocol

Synchronization method Asynchronous

Transmission speed 300, 600, 1200, 2400, 4800, 9600, 19200 bps (switch selectable)

Data format 1 start bit, 7 or 8 data bits, 1 or none parity bit, 1 or 2 stop bit (switch selectable)

Access cycle Made at END of sequence program. Access time is equal to scan time

Error detection Parity check present odd/even or absent, sum check present or absent

ER/DR control Present

DC1/DC3 Absent

Transmission distance Up to 15m for RS232C, Up to 500m for RS422

Transmission code ASCII

I/O points required 32 points

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AJ71UC24 computer interface module specifications

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System configuration example

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Special communication modules

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