from the opc communication department...OPC tags stop updating...start once the tags are added again
Utilizing an opc client ..the values stopped updating after a while (20 days) .Once i added the tags again into the same group they start updating .Everything is fully licensed so it is not a licensing issue.
from the INSTRUMENTATION department...UREA FLOW METER
What type of flowmeter can be installed in a Urea duct as a source of FD and ID fan in the duct?
> What are you measuring? Just air flow? Thank you for your response. Sir, as it is a large...
By Billy on 15 April, 2014 - 10:30 pm -
What are you measuring? Just air flow? We use a DP transmitter for our prill tower air ducts....
from the Forum department...Modbus mapping registor reading at register plus 1
why the modbus mapping register is visible at register address +/- 1 address.
> Guys who live in cubes write the code. Hence, it depends on whether the guy who > wrote...
By Jay on 24 April, 2014 - 1:34 am -
Hi, the numbering is introduced in the official Modbus Application Protocol Specification (page...
Guys who live in cubes write the code. Hence, it depends on whether the guy who wrote the code...
from the Automation and EMS department...Unity Pro communications
Need help for communication of NOE with M340.
By Brian Cervi on 23 April, 2014 - 4:16 pm -
This is compatibility error due to upgrade of firmware in NOE. Likely Unity V5 does not support the...
from the Forum department...How To connect Vijeo citect with Untiy Pro XL
help me to connect Vijeo citect and unity pro xl
By Ikhtiander on 23 April, 2014 - 9:11 am -
Hi Rizki, it is difficult to find comprehensive tutorial on your native language. I found link...
from the Modbus department...S7 PLC as a MODBUS slave
would like to make S7 PLC as a MODBUS slave and a PC Master MODBUS
By Steve Myres on 22 April, 2014 - 1:27 pm -
Forgot to mention in my previous post. The reason I distinguished between tech and business aspects...
By Steve Myres on 22 April, 2014 - 12:14 pm -
Have never done it using the Siemens Ethernet port, but I have done that on a 315-2DP using a...
from the Forum department...MODBUS Function code
MODBUS function code of address word
from the Forum department...Modbus via microcontroller
Communicating with device via Modbus RTU through a microcontroller.
By Lynn August Linse on 21 April, 2014 - 1:56 pm -
The "try a PC" option is always a wise first-step ... make sure you can trust your tools...
I'd suggest you first try an easy way to use a PC: http://www.ctrlterm.com/custom.htm Once the...
If it were me, I'd connect a PC with a serial port running a generic Windows Modbus 'test' master,...
from the Forum department...MODBUS COMPATIBILITY ISSUES WITH WINDOWS 7
We are facing problem with Modicon MODBUS Serial IO Server 7.5 (184.108.40.206) with win7 as compatibility issues.
from the Controls department...Mark-VI Control System T-core Issue
Issue being faced on T-core of Mark-VI
Was reading this thread and one question comes to my mind. There was a mention of Lockout Relay...
Yes, technically T-controller is down. As regards time, PC is running on localized clock and...
Online replacement of VCMI can be done as the system is already running on R and S processors as I...
from the Forum department...Upgrading Siemens PCS7 V 6.1
Can you plz suggest the best solution to upgrade Siemens PCS7 to latest version?
from the ANY department...Software suggestions
New to automation and searching for a simple solution on some safety concerns.
from the Automation department...DCS Yokogawa Communication Issue
Yokogawa DCS communication with Modbus slave device using ethernet redundant connection with ALE111.
By Elbert van der Bijl on 17 April, 2014 - 5:15 am -
this behavior is by design and it will not occur when the Modbus slave is correctly responding to...
from the Communications department...OPC server communicate with OPC server
How do one OPC server share data with another OPC server?
In order to facilitate such communication you typically use an OPC client that connects to both...
from the Computer department...Serial Communication VB Code
Continuous reading of serial input
from the Automation and EMS department...Modbus Data transmission time
How to calculate time to receive data from slave to master in daisy chain connection of slaves, if my slaves are 20 and single master.
By Patrick Lansdorf on 16 April, 2014 - 1:55 am -
Hi, I have made a simple Excel sheet, where one can calculate the line time. You will need to...
By Steve Myres on 15 April, 2014 - 12:55 pm -
Slick idea on the prefetch! ...
By Lynn August Linse on 15 April, 2014 - 9:31 am -
>> What's a rule-of-thumb value for >> RTU-TCP latency in a Digi Modbus bridge...
By Bhadresh Sarvaiya on 15 April, 2014 - 1:29 am -
> Mr. Linse, > What's a rule-of-thumb value for RTU-TCP latency in a Digi Modbus bridge...
Mr. Linse, What's a rule-of-thumb value for RTU-TCP latency in a Digi Modbus bridge product? ...
By Lynn August Linse on 14 April, 2014 - 10:36 am -
Just be careful to accommodate the delay-back off during failure. With a single device, it might...
By Curt Wuollet on 13 April, 2014 - 5:19 pm -
It depends on how it's written. In the system I just set up, I use a state machine to do the...
By Bhadresh Sarvaiya on 13 April, 2014 - 5:14 am -
Thank you for your kind reply.. but i didn't get answer as i want.. i didn't understand your...
You know - the word size, 11 bits - the number of words in the master message - silent...
from the I'm in trouble department...MODBUS ABB ACS550 Connection trouble
MODBUS connection trouble... How to create a virtual COMM port
By MC on 14 April, 2014 - 6:39 pm -
Looks like USB conversion would be your best alternative. Here's a device from a company that...
By Steve Myres on 13 April, 2014 - 11:26 am -
The port behind the keypad, although RJ45, is serial, not Ethernet, so even if you could find a...
from the Tag Prefix WinCC V7.2 department...Tag Prefix WinCC V7.2
Communicating with Tag Prefix WinCC V7.2 using MODBUS TCP/IP protocol.
from the Annoying Exceptions department...Negative Acknowledge and Bad Karma
How do you feel about security exceptions not being, you know, informative?
By JulieInAustin on 13 April, 2014 - 2:24 pm -
> What product are you working on, and are there any other security enhancements you are making?...
By JulieInAustin on 13 April, 2014 - 2:16 pm -
> Wait....when Digi hires you, you'll STOP writing code?? Digi -- don't hire Julie! No, Digi...
from the control systems department...Meaning of the "smiley symbol" in MARK V csp file
In the csp file of MARK V control system, can any body tell me what the "smiley symbol" means in the BBL logics?
mhkhan, It's presumed you're referring SPECIFICALLY to the CSP.PRN file. It means EXACTLY...
from the TPS SI Commincated by modbus department...Modbus problem with honeywell TPS
Decompressing Modbus word and still receiving appropriate feedback information