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《Differences between Modbus and Memobus》.pdf
TECHNICAL NOTE
MOTION PRODUCT AND ENGINEERING GROUP
Subject: Differences between Modbus and Memobus
Product: MP9xx
Summary:
Yaskawa MP9xx products use Memobus communication. This protocol is very
similar to Modbus. This document outlines the differences between the two
protocols.
Further Documentation:
This document describes the difference between Memobus and Modbus. For additional detailed
information, please refer to the following documents:
• SIE-C815-13.60E “Memobus Descriptive Information”
• SIEZ-C887-1.2 “Machine Controller MP9xx Ladder Programming Users Manual”
Memobus Basics:
When communicating with an MP9xx series controller and an HMI, the HMI should be the master,
and the MP9xx should be the slave. Up to 63 slaves can be addressed using Memobus. The
DEFAULT HMI Driver protocol settings are as follows:
Transmission rate: 19.2 kbps
Transmission mode: RTU (Remote Terminal Unit)
Data: 8 bits
Parity Check: Even parity
Stop bit: 1 bit
Error Check: CRC-16 (Cyclic Redundancy Check)
Transmission: Half duplex, asynchronous
MP9xx Port: port #2
Slave Address: 1
The MP9xx controller will use a message receive function called “MSG-RCV” in slave mode. This
function accepts standard Modbus function codes in its messaging format. Note that physical
hardware outputs are not supported by the Memobus protocol. This is for safety and to avoid
conflicts due to unplanned writing of direct control outputs between the HMI and MP9xx ladder
program.
Yaskawa Electric America - 2121 Norman Drive South – Waukegan IL 60085
(800) YASKAWA - Fax (847) 887-7280
6/14/2001 1 of 5 eng/01.013/MCD
TECHNICAL NOTE
MOTION PRODUCT AND ENGINEERING GROUP
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