《Differences between Modbus and Memobus》.pdf

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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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