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Communications D - 2

Using Modbus Communication

Serial communication can be performed with Program Logic Controllers (PLCs) or similar master devices using the Modbus

protocol.

 Modbus Communication Configuration

Modbus communication is configured using 1 master (PLC) and a maximum of 31 slaves. Serial communication between

master and slave is normally initiated by the master and responded to by the slaves.

The master performs serial communication with one slave at a time. Consequently, the slave address of each slave must be

initially set, so that the master can perform serial communication using that address. Slaves receiving commands from the

master perform the specified functions, and send a response back to the master.

Fig D.1 Example of Connections between Master and Drive

 Communication Specifications

The Modbus communication specifications are shown below:

Table D.1 Modbus Communication Specifications

Item Specifications

Interface RS-422, RS-485

Communications Cycle Asynchronous (Start-stop synchronization)

Communications Parameters

Baud rate: Select from 1200, 2400, 4800, 9600, and 19200 bps.

Data length: 8 bits fixed

Parity: Select from even, odd, or none.

Stop bits: 1 bit selected

Communications Protocol Modbus RTU

Number of Connectable Units 31 units maximum

Master

F7 F7

Slaves

1 2 ... 216 217 218 219 220 221 222 223 224 225 226 ... 254 255

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Yaskawa F7 Drive User Manual Bedienungsanleitung Seite 221