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Programming 83
H5 Serial Communications Setup
This section explains the individual functions used in special applications involving Modbus Communications.
Using Modbus Communication
Serial communication can be performed with Programmable Logic Controllers (PLC’s) or similar 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
individually 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. 62 Example of Connections between Master and Drive
Communication Specifications
The Modbus communication specifications are shown below:
Table 20 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
Number of Connectable Units
31 units max.
Master
E7
E7
E7
Slaves
Содержание E7U
Страница 1: ...E7 Drive Programming Manual Model E7U Document Number TM E7 02...
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Страница 174: ...Factory Default Settings B 4 Notes...