IDEC FT1A Series User Manual

S MART AXIS P RO /L ITE U SER ' S M ANUAL FT9Y-B1378 11-1
11:MODBUS COMMUNICATION
Introduction
The SmartAXIS supports the Modbus communications protocols.
When a communication cartridge is installed on the expansion communication port, Modbus RTU protocol can be used. The
SmartAXIS can communicate with hardware devices supporting Modbus RTU protocol via RS-232C/RS-485.
Modbus TCP protocol can also be used on the built-in Ethernet port. The SmartAXIS can communicate with hardware devices
supporting Modbus TCP protocol via Ethernet.
Modbus Communication via RS-232C/RS-485
Applicable SmartAXIS
The SmartAXIS supports the Modbus RTU protocol and can be used as the Modbus RTU master and the Modbus RTU slave. When
configured as a Modbus RTU master, the SmartAXIS can monitor and change the data of Modbus RTU slave devices. When the
SmartAXIS is configured as a Modbus RTU slave, the device data of the SmartAXIS can be monitored and changed from the
Modbus RTU master device.
For the Modbus RTU master function and how to configure it, see "Modbus Master Communication" on page 11-2. For the Modbus
RTU slave function and how to configure it, see "Modbus Slave Communication Specifications" on page 11-8.
Notes:
• Modbus communication of the SmartAXIS does not support ASCII mode. Configure all the Modbus devices to communicate with as in RTU
mode.
• The 24-I/O type has one expansion communication port. The 40- and 48-I/O types have two expansion communication ports. The 12-I/O
type has no expansion communication port.
FT1A-12 FT1A-24 FT1A-40 FT1A-48
—XXX
Modbus RTU Master Modbus RTU Slave 1 Modbus RTU Slave 31
Shielded 2-core twisted pair cable, total length 200 m

IDEC FT1A Series Specifications

General

Programming Software	WindLDR
Type	Programmable Logic Controller (PLC)
Display	LCD (varies by model)
Communication Ports	RS232C/RS485 (built-in), USB (programming), Ethernet (optional)
Dimensions	Varies by model
Weight	Varies by model
Model	FT1A Series