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LJ71C24

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MELSEC-L Series Serial Communication Unit (LJ71C24)

Name: MELSEC-L Series Serial Communication Unit
Brand: MITSUBISHI
Price: 25563 THB
Availability: PreOrder

PLC(EXPANSION UNIT)

MELSEC-L Series Serial Communication Unit (LJ71C24)

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(i)Caution

This product belongs in RoHS Directive under Category 9 "Monitoring and control equipment" with exclusion from the usage restriction of phthalate esters until 21 July 2021.

Product Description

Mitsubishi light & flexible sequencer.
[Features]
· Capable of non-procedural protocol communications by transmitting/receiving data based on the communication protocol specified by the external devices.
· Can connect to a device simply by selecting the device from the communication protocol library.
· Creating and editing communication protocols are easy, too.
[Applications]
· For reading/writing of the data on the sequencer from the external device.

Serial Communication Unit Features

Immediate Connection for Communication With Desired Device

All you have to do is to select any device you want to communicate with from the GX Works2 communication protocol library, and you can connect to the device immediately.
1. Select the manufacturer and model (series) of the connecting device: No need to set a complex communication protocol with the connecting device. Just select from the pre-prepared communication protocol library.

Communication protocol library

2. Write a communication protocol to the unit: Write a pre-defined communication protocol to the serial communication unit. Up to 128 settings can be made per unit.

Image of writing a communication protocol

3. Execute the protocol from the ladder program: Via the ladder program you can communicate with external devices simply by executing the dedicated command for starting the communication protocol.

Image of executing the dedicated command

Easy to Create and Edit Communication Protocols

Even when a desired device is not found in the communication protocol library, an additional communication protocol can be created in easy steps.

Image of creating a communication protocol

The content of the created communication protocol can be displayed in a list and can be edited easily.

Image of editing

Serial Communication Unit Specifications

Item		LJ71C24	LJ71C24-R2
Interface	ch1	RS-232 compliant (D-Sub 9P female)	RS-232 compliant (D-Sub 9P female)
Interface	ch2	RS-422/485-compliant (2-piece terminal block)	RS-232 compliant (D-Sub 9P female)
Communication method	Circuit	Full-duplex / half-duplex
	MC protocol	Half-duplex
	Communication protocol	Full-duplex / half-duplex
	Non-procedural protocol
	Bidirectional protocol
Synchronization method		Asynchronous method
Transmission speed		50 bps / 300 bps / 600 bps / 1,200 bps / 2,400 bps / 4,800 bps / 9,600 bps / 14.4 kbps / 19.2 kbps / 28.8 kbps / 38.4 kbps / 57.6 kbps / 115.2 kbps / 230.4 kbps 230.4 kbps can be used on the ch1 side only. (Cannot be used on the ch2 side) The total transmission speed of the two interfaces may be used within 230.4 kbps. If the send/receive data monitoring function is used, the total transmission speed of the two interfaces may be used within 115.2 kbps.
Data format	Start bit	1
	Data bit	7 or 8
	Parity bit	1 (vertical parity) / None
	Stop bit	1 or 2
Access cycle	MC protocol	One request is processed during END processing of the CPU unit for the C24 installed station. (The number of scans / link scans required for this process varies depending on the specific request.)
	Communication protocol	In both send and receive operations, this request is processed when the dedicated command (CPRTCL command) is executed.
	Non-procedural protocol	Data is sent every time a send request is made, while reception of data can be made at all times.
	Bidirectional protocol
Error detection	Parity check	Applicable to all protocols. If applicable, select odd or even using parameters.
Error detection	Checksum code	For MC protocol or bidirectional protocol, select by parameter. For communication protocol, whether or not a checksum code is available is determined by the selected protocol. In the case of a non-procedural protocol, a checksum code is selected by a user-registered frame.
Transmission distance (total extension distance)	RS-232	Maximum 15 m
Transmission distance (total extension distance)	RS-422/485	Maximum 1,200 m (total extension distance)	-
Number of units occupied		1
Number of occupied inputs/outputs		32 points (I/O assignment: Intelligent 32 points)
5 V DC internal current consumption		0.39 A	0.26 A
Weight		0.17 kg	0.14 kg

Transmission Control

	RS-232	RS-422/485
DTR/DSR (ER/DR) control	Available	Not available
RS/CS control	Available	Not available
CD signal control	Available	Not available
DC1/DC3 (Xon/Xoff) control DC2/DC4 control	Available	Available