Yaskawa Matrix Converter - Manual (Page 247)

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Individual Functions
This section explains the individual functions used in special applications.
‹ Using MEMOBUS Communications
The serial communications with MEMOCON-series Programmable Controllers (PLCs) or similar devices can
be performed 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 slave responds.
The master performs signal communications with one slave at a time. Consequently, be sure to set the address
of each slave beforehand, so the master can perform signal communications using that address. Slaves Receiv-
ing Commands from the master perform the specified function, and send a response to the master.
Fig 6.57 Example of Connections between PLC and MxC
„ 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 1200, 2400, 4800, 9600, and 19200 bps.
Data length 8 bits fixed
Parity Select from even, odd, or none.
Stop bits 1 bit fixed
Communications Protocol MEMOBUS (RTU Mode only)
Number of Connectable Units 31 units max (when using RS-485)
MxC MxC MxC
MEMOCON-series PLC
RS-485 connections
example