Individual Functions; Using Memobus Communications - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

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.
Communications Specifications
The MEMOBUS communications specifications are shown in the following table.
Interface
Communications Cycle
Communications Parameters
Communications Protocol
Number of Connectable Units
-68
6
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PLC
Fig 6.43 Example of Connections between PLC and Inverter
Item
RS-422, RS-485
Asynchronous (Start-stop synchronization)
Baud rate:
Data length:
Parity:
Stop bits:
MEMOBUS
31 units max.
Inverter Inverter
Specifications
Select from 1,200, 2,400, 4,800, 9,600 and 19,200 bps.
8 bits fixed
Select from even, odd, or none.
1 bit selected
Inverter