2/13/2018 12:57 AM | |
Joined: 9/27/2006 Last visit: 3/28/2024 Posts: 12249 Rating: (2660) |
Hello Andrew; Strange that the Modbus RTU transmission would work both with Even and Odd parity settings with your G120 drives. Examine the Modbus chapter in the following document: https://support.industry.siemens.com/cs/ww/en/view/109751350 Could you check p2031, as shown in the attachment below?. My experience has been that the parity setting should be the same for all slaves on a Modbus master's network. Well, actually, all the transmission parameters should be setup the same in a working Modbus network.. Normally, a slave would be described (by the manufacturer, on the datasheet) as 9600, 8,O,1, or 19200, 8, E, 1, or 38400, 8,N, 2 for example. This corresponds to a structure of [speed in bauds, bits/character, Parity, no. of Stop bits]. These must match in all nodes, master and slaves. Since parity is used for basic error checking and correction in serial transmissions, you must implement it correctly in ll nodes. Factory settings for the G120 include Even parity (see the attachment again); unless someone changed the value in p2031, you should setup your master for Even parity also. If not you cannot guarantee correct transmission of data over the network. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 2/13/2018 1:00:01 AM |
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