User`s manual

ManualsBrandsMitsubishi Programmable Controllers ManualsAdapterFX-232ADP

FX3U Series Programmable Controllers

User’s Manual - MODBUS Serial Communication Edition

Table of Contents

SAFETY PRECAUTIONS .................................................................................................. (1)

Related manuals........................................................................................................................ 6

Generic Names and Abbreviations Used in Manuals ............................................................ 7

1. Outline 8

1.1 Outline of System............................................................................................................................ 8

1.2 Major Procedures until Operation ................................................................................................... 9

1.3 PLC Communication Type Applicability ........................................................................................ 10

1.3.1 Applicable versions........................................................................................................................ 10

1.4 Programming Tool Applicability..................................................................................................... 11

1.4.1 For applicable versions.................................................................................................................. 11

2. Specifications 12

2.1 Communication Specifications ...................................................................................................... 12

2.2 Link Time....................................................................................................................................... 13

3. System Configuration 16

3.1 System Configuration.................................................................................................................... 16

3.2 Applicable FX PLC and Communication Equipment..................................................................... 17

3.3 Limitation when Channel 1 and Channel 2 are used at the same time......................................... 19

4. Wiring 20

4.1 Wiring Procedure .......................................................................................................................... 20

4.2 Selecting Connection Method ....................................................................................................... 21

4.2.1 For communication in accordance with MODBUS RS-232C (1-to-1 connection) ......................... 21

4.2.2 For communication in accordance with MODBUS RS-485 (1-to-N connection) ........................... 21

4.3 Selecting Cables and Terminal Resistors (MODBUS RS-485)..................................................... 22

4.3.1 Twisted pair cable.......................................................................................................................... 22

4.3.2 Connecting cables......................................................................................................................... 23

4.3.3 Connecting terminal resistors........................................................................................................ 23

4.4 Connection Diagram for MODBUS RS-232C................................................................................ 24

4.4.1 Connection diagram between FX PLC and MODBUS RS-232C equipment................................. 24

4.5 Connection Diagram for MODBUS RS-485 .................................................................................. 25

4.5.1 One-pair wiring .............................................................................................................................. 25

4.5.2 Two-pair wiring .............................................................................................................................. 25

4.6 Grounding ..................................................................................................................................... 26

5. Communication Setup 27

5.1 Setup method for MODBUS serial communication ....................................................................... 27

5.2 Example of communication setup ................................................................................................. 27

5.3 Simultaneous N:N Networking and MODBUS Communication .................................................... 30

5.4 Cautions on Communication Setup............................................................................................... 31