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Modbus

(8/31/2015)

Modbus/TCP Network Module

The QJ71MT91 module offers a full MODBUS/TCP network communications facility to any Q Series system. Use this module to establish control of a MODBUS/TCP network of devices from a Q Series based system.

Key Features:

  • Easily configured with Intelligent Function Module utilities in GX Developer or GX Works2 (requires plug-in)
  • GX Configurator-MB or GX Configurator2-MB reduce setup and maintenance time
  • Master communication function supports both automatic communications or communication under program control if required
  • Also supports slave communication functions including automatic response and MODBUS device assignment
  • Both slave and master functions can operate concurrently
  • 100Mbit Ethernet capability with KeepAlive and router relay functions
QJ71MT91_opt

Required Manuals

Model Number

Description

Contents

Included?

Stocked Item

IB(NA)0800280

MODBUS/TCP Interface Module User’s Manual (Hardware) QJ71MT91

Basic information on QJ71MT91

Yes

-

SH(NA)080446

MODBUS/TCP Interface Module User’s Manual

Covers QJ71MT91 and GX Configurator MB

Included with GX Configurator MB as PDF

-

Note: Many of these manuals are available by free download from our website, www.meau.com

Model Number

QJ71MT91

10BASE-T

100BASE-TX

Stocked Item

S

Certification

UL • cUL • CE

Transmission Specifications

Data Transmission Rate

10Mbps

100Mbps

Maximum Node-To-Node Distance

200m

Maximum Segment Length (*1)

100m

Number of Cascade Connection Stages

Max. 4 stages

Max. 2 stages

Maximum Number of Connections (*2)

64 connections

Number of Routers That Can Be Set

1 default router + any 8 routers

Cable

Cable compliant with the IEEE802.3 10BASE-T Standard (unshielded twisted pair cable (UTP cable), Category 3, 4, 5)

Cable compliant with the IEEE802.3 100BASE-TX Standard (shielded twisted pair cable (STP cable), Category 5)

Connector Applicable For External Wiring

RJ45

Master Function

Automatic Communication Function

Number of Slaves (*3)

64 slaves

Input Area Size

4k words

Output Area Size

4k words

Dedicated Instruction

Number of Instructions That Can Be Executed Concurrently (*4)

Up to 8 instructions

Input Area Size

Max. 253 bytes per instruction

Output Area Size

Max. 253 bytes per instruction

Slave Function

MODBUS
Device Size

Coil

64k points

Input

64k points

Input Register

64k points

Holding Register

64k points

Extended File Register

Max. 4086k points

No. of Simultaneously Acceptable Request Messages

64

Number of Simultaneously Connectable MELSOFT PCs

Max. 8

I/O Device Points Occupied

32 points

5VDC Internal Current Consumption

0.52A

Weight (kg)

0.11

Base Unit Slots Occupied

1

Notes:

  1. Length between a hub and a node.
  2. Indicates the number of TCP connections that can be established simultaneously.
  3. Indicates the maximum number of slaves that can be communication targets.
  4. Indicates the maximum number of dedicated instructions that can be started simultaneously from a sequence program.

MODBUS® RTU Master Module

The QJ71MB91 module adds Modbus RTU capability to a Q Series system. Use this module to communicate with and control any of a wide variety of third party Modbus compatible products.

Key Features:

  • Easily configured with Intelligent Function Module utilities in GX Developer or GX Works2 (requires plug-in)
  • GX Configurator-MB or GX Configurator2-MB reduce setup and maintenance time
  • Supports master communication with automatic communication
  • Dedicated instructions are available for communications
  • Supports slave communications with automatic response and device assignment function
  • Link operation function; allows a third party Modbus device to communicate with Modbus slaves connected to the Q Series controller via the QJ71MB91 module
  • 115.2kbps communication speed
QJ71MB91_opt

Required Manuals

Model Number

Description

Contents

Included?

Stocked Item

IB(NA)0800329

Modbus Interface Module User’s Manual (Hardware)

Basic information on the QJ71MB91

Yes

-

SH(NA)080578

Modbus Interface Module User’s Manual

Covers QJ71MB91 and GX Configurator MB

No

-

Note: Many of these manuals are available by free download from our website, www.meau.com. Modbus is a registered trademark of Schneider Electric.

Model Number

QJ71MB91

Stocked Item

S

Certification

UL • cUL • CE

Transmission Specifications

Number of Interfaces

RS-232 1 channel; RS-422/485 1 channel

Transmission Speed (bps)

Total transmission speed of two interfaces must be 115200 bps or less


300

600

1200

2400

4800

9600

14400

19200

28800

38400

57600

115200

Transmission Distance (Overall Distance)

RS-232

Max. 15m (49.2 ft.)

RS-422/485

Max. 1200m (3936.9 ft.) (Overall distance)

Master Function

Automatic Communication Function

Number of Slaves (*1)

32 per channel

Input Area Size

4k words

Output Area Size

4k words

Dedicated Instruction

Number of Instructions That Can Be Executed Concurrently (*2)

1 per channel

Input Area Size

Max. 253 bytes per instruction

Output Area Size

Max. 253 bytes per instruction

Slave Function

MODBUS® Device Size

Coil

64k points

Input

64k points

Input Register

64k points

Holding Register

64k points

Extended File Register

Max. 4086k points

Number of Simultaneously Acceptable Request Messages

1 request per channel

Station Number

1 to 247

I/O Device Points Occupied

32 points

5VDC Internal Current Consumption

0.31A

Weight (kg)

0.20

Base Unit Slots Occupied

1

Notes:

  1. Indicates the maximum number of slaves that can be communication targets.
  2. Indicates the maximum number of dedicated instructions that can be activated simultaneously from a sequence program.