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Individual Functions
Using MEMOBUS Communications
You can perform serial communications with Programmable Logic Controls (PLCs) or similar devices using
the MEMOBUS protocol.
MEMOBUS Communications Configuration
MEMOBUS communications are configured using 1 master (PLC) and a maximum of 31 slaves. Serial com-
munications between master and slave are normally started by the master and the slaves respond.
The master performs serial communications with only one slave at a time. Consequently, you must set the
address of each slave before, so that the master can perform serial communications using that address. A slave
that receives a command from the master performs the specified function and sends a response to the master.
Fig 6.43 Example of Connections between PLC and Inverter
Communications Specifications
The MEMOBUS communications specifications are shown in the following table.
Item Specifications
Interface RS-422, RS-485
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
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