Confusion about using Modbus to read the status of discrete inputs
MODBUS - RTU Implementation Using AVR ATMEGA32A Controllers and RS485
Simple MODBUS - RTU implementation using AVR ATMEGA32A controllers and RS485 as the electrical layer.
Modbus function code 03 and 04 confusion
By Harvard on 2 December, 2016 - 12:06 pm
Function Code 4 is used to read analog inputs that come from an analog to digital converter and...
Can't establish RS232 Cisco console session using RS232 fiber converter
By Garym on 2 December, 2016 - 4:05 am
HI there Check your sp modules if applicable are capable for shorthaul/longhaul, singlemode,...
By Robert Dusza on 1 December, 2016 - 10:15 am
Hi, Make sure that you 1 mile fiber connection is working OK. Need to do a loss test on each...
One RS485 device does not work when it is in the RS485 network with the other six devices, but it works when it is the only device on the network.
By W.L. Mostia on 15 November, 2016 - 4:12 pm
I have seen this problem caused by software the supports a fixed number of devices, maybe in this...
Driving an Analog Output Module of Phoenix Contact with Foxboro IA System
A problem writing a value to Analog output module of phoenix contact using Modbus. Control system is Foxboro IA series V8.2. Modbus module is FBM230.
Setting up Profinet I/O in Siemens TIA Portal
Siemens PLC Controlling a Lenze servo
By Steve Myres on 28 November, 2016 - 4:10 pm
The general procedure for third-party slave devices is to download from the manufacturer the...
Citect v7.40 SP1 - PM710 meter - FloatMode problem
Posted by agoslinski on 10 June, 2016 - 4:05 am
I have a problem with reading values from energy meter PM710 (Citect - Modnet - PM710)
WattStopper HLINKCC and Old Lighting Integrator Panels
Interfacing with an old Wattstopper HLINKCC and LI LCPs
Vijeo Citect MODBUS RTU Communication
Problem communicating between Vijeo citect and a MODBUS Device (Preset ACCULOAD).
No connection to from controller rs485 to PC.
Error from Type K Extension vs Thermocouple Wire
What would the magnitude of the error be from using just extension wire, not thermocouple wire?
By Joseph Ugalde on 18 November, 2016 - 9:06 am
I happen to work at a a thermocouple couple vendor and noticed your inquiry on here. The issue...
Implementing Modbus RTU system (PLC to 4 slaves). Necessary to set the polling delay to 100mS. No indication of polling delay requirement in Modbus Protocol. Why a delay?
By Graham Pyatt on 18 November, 2016 - 3:38 am
>It is a common misconception that doubling (or 4 fold >increase) will result in the same...
By Graham Pyatt on 17 November, 2016 - 7:47 am
>The required (Turnaround) delay is most likely due to 1/2 >duplex physical layer like 2...
By Harvard on 16 November, 2016 - 11:59 am
The required (Turnaround) delay is most likely due to 1/2 duplex physical layer like 2 wire RS485....
Compactlogix PLC with HART
Connecting a Compactlogic PLC with a 1769sc-IF4IH HART module
By Ikhtiander on 18 November, 2016 - 12:08 am
Hello imti2356, 1769sc-IF4IH module is a 3rd party product made by Spectrum Control, have you...
Using CClink Slave NT and observing that I/O data bytes are getting shifted.
Monitoring and Controlling Central Air Conditioners
Questions about setting up automation project for central air-conditioning system
Modbus TCP Connect with Website
Can I connect from website with PLC S7-1200
By pvbrowser on 11 November, 2016 - 12:26 am
Start a separate daemon that does modbus communication on the same computer as the webserver, ...
Honeywell Experion SCADA vs PCDI Communication
Using PCDI vs SCADA in Honeywell Experion with Modbus TCP
Modbus RTU to TCP via virtual com port?
My problem: Getting software that only scans for COM ports (Modbus RTU) to connect to a Modbus TCP device.
By WallRoy on 10 November, 2016 - 9:22 am
I use this software Virtual RS485 Port Driver (http://www.eltima.com/products/virtual-rs485-port/) ...
Endress and Hauser Promag 53 Network Failure
Trying to figure out why FITs lose network communication at times.
By Maclaughlin on 9 November, 2016 - 8:29 pm
Hi Ikhtiander, we will try and post the requested details when the error happens again. Thanks...