Sep 2, 2025 · This article introduces Modbus, an industrial protocol that laid the foundation for fieldbus communication in industrial systems.

May 22, 2012 · Modbus Poll is the master and you must disconnect the existing master before using it. If the situation is that you actually use Modbus Poll as master the problem could be …

Dec 23, 2009 · The big difference (& problem) with Modbus/RTU is that it lacks a sequence number so when pushing Modbus/RTU for max performance with short time-outs etc, you risk …

Sep 3, 2024 · View attachment 4356 View attachment 4357 Hardware setup: we have the PLC connected to 2 modbus slaves. Slaveid 1 and Slaveid 2 the also RS485 blinks at the TxD at …

Feb 24, 2010 · Hi, A customer has asked if he can read application information from the PLC (Version, author, project name etc) over modbus to display on his touch screen HMI. I am the …

Jun 25, 2008 · Modbus is a protocol. You can use Modbus protocol over Ethernet, it is then called Modbus TCP/IP. Commonly used by Schneider Electric, as Schneider bought the company …

Jan 19, 2005 · Swapping the lines would definately be your best bet, I've done extensive work with Modbus communication over RS-485 and getting the wires in the right connection is …

Jul 28, 2011 · In a system with one PLC providing process control and monitoring a series of pump VFD's and process water chillers, we wish a second PLC to be "backup". If the main …

May 21, 2008 · The Modbus serial driver can be configured to talk to the Omni Flow both serially and via Modbus Ethernet. You can use the Modbus Slave, Ethernet or Plus drivers to provide …

Dec 2, 2005 · Dear friends, I would appreciate your help with the following issue: I have a RS485 modbus RTU network, ControlLogix Prosoft MVI56-MCM module as master. Two slaves on …