Mitsubishi Electric FX3U-232-BD - MODBUS Communication

A-12
FX Series PLC User's Manual - Data Communication Edition
Common Items
1 Introduction
1.2 Outline and Features of Communication Types
1.2.8 MODBUS Communication
For details, refer to FX3S/FX3G/FX3GC/FX3U/FX3UC User's Manual
- MODBUS Serial Communication Edition.
1. Outline
1) In the case of the RS-485
2) In the case of the RS-232C
2. Applicable PLCs
:Applicable (If applicable versions of main units are limited, they are described inside ( ).)
—:Not applicable
3. Communication targets
MODBUS-compatible equipment
4. Function
This function enables MODBUS communication with MODBUS-compatible equipment in accordance with
RS-232C or RS-485.
5. Applications
Line control in the decentralized or centralized method.
PLC FX2(FX),FX2C FX0N FX1S,FX1N,FX1NC FX2N,FX2NC FX3S FX3G FX3GC
FX3U,
FX
3UC
Communication
applicability
—— — —

(Ver. 1.30
or later)


(Ver. 2.40
or later)
RS-485 RS-485 RS-485
• • • • • • • • • • • • • • •
Terminal resistor
Terminal
resistor
FXCPU
master
FXCPU
slave
No.1
FXCPU
slave
No.32
• Number of connectable units: Master 1
: Slave 32 maximum
• Total extension distance : 500 m (1640’5”) maximum
RS-232C RS-232C
FXCPU
master
FXCPU
slave
• Number of connectable units: Master 1
: Slave 1
• Total extension distance : 15 m (49’2”) maximum