Individual Functions
6-69
Individual Functions
îš‹ Using MEMOBUS Communications
The Varispeed E7 is equipped with a RS422/485 serial communication port using the MEMOBUS protocol
îš„MEMOBUS Communication Configuration
MEMOBUS enables a master device (e.g. PLC) to communicate with up to 31 slave devices (e.g. Inverters).
Basically the slaves respond on messages sent from the master.
The master performs serial communications with only one slave at a time. Consequently, to every slave a
address must be assigned.
Fig 6.50 Example of Connections between PLC and Inverter
îš„Communications Specifications
The MEMOBUS communications specifications are shown in the following table.
Item Specifications
Interface RS422, RS485
Communications Cycle Asynchronous (Start-stop synchronization)
Communications Parameters
Baud rate: Select from 1,200, 2,400, 4,800, 9,600 and 19,200 bps.
Data length: 8 bits fixed
Parity: Select from even, odd or none.
Stop bits: 1 bit selected
Communications Protocol MEMOBUS
Number of Connectable Units 31 units max.
PLC
Inverter Inverter Inverter
To Next Page
Loading...
Need help?
General