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Control.com topic...
Networking
Topic: Software, including programming, OS issues, etc.
from the ANY department...
Software suggestions
Posted by Centrafused on 17 April, 2014 - 8:04 pm
New to automation and searching for a simple solution on some safety concerns.
Topic: Communications systems and equipment.
from the Automation department...
DCS Yokogawa Communication Issue
Originally posted by Zarar on 13 April, 2014 - 2:21 pm
Yokogawa DCS communication with Modbus slave device using ethernet redundant connection with ALE111.
New Replies:
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...
Topic: Communications systems and equipment.
from the Automation and EMS department...
Modbus Data transmission time
Originally posted by Bhadresh Sarvaiya on 12 April, 2014 - 7:58 am
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.
New Replies:
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...
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...
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...
Topic: Communications systems and equipment.
from the Forum department...
SCADA RTU in Substation
Posted by SSU on 16 April, 2014 - 12:56 am
Why use SCADA RTU in a substation? What is the purpose of SCADA RTU?
Topic: Local and wide area networking in factory automation.
from the I'm in trouble department...
MODBUS ABB ACS550 Connection trouble
Originally posted by Christopher James Churchill on 13 April, 2014 - 7:59 am
MODBUS connection trouble... How to create a virtual COMM port
New Replies:
Looks like USB conversion would be your best alternative. Here's a device from a company that...
The port behind the keypad, although RJ45, is serial, not Ethernet, so even if you could find a...
Topic: Sensor technologies.
from the Thermocouple department...
Thermocouple cable configuration
Originally posted by Shrk on 4 April, 2014 - 7:28 am
Choosing thermocouple cable configuration- twisted pair or coaxial (multi cored)
New Replies:
please note that T/C TYPE N lower cost compensated can be used depends up on your critical...
Shrk, www.omega.com is a very good resource for all kinds of sensors, particularly RTDs and...
Hi. Thanks. tried looking, did not get much info. Will certainly try again. Again, thanks...
You need to use thermocouple extension wire and thermocouple terminal blocks, having the same...
Topic: PLCs and related questions.
from the Instruments Department department...
Modbus Max. Length
Originally posted by Franco Kew on 8 April, 2014 - 10:34 pm
Measure the total Modbus Length
New Replies:
Dear CWW, Maybe I use the wrong wording in my post, but I am not using the star topology. I try...
Hadn't thought of segmenting the network with repeaters to fix the topology - slick! Franco,...
By Lynn August Linse on 9 April, 2014 - 9:46 am -
This is an RS-485 issue, not Modbus question. Max length is more an issue of the cable quality...
You're not supposed to run RS485 in a star topology. Not sure if short branches are officially...
That doesn't sound like a workable configuration. 485 doesn't like star layouts. You can use...
Originally posted by Fuzzy Logic on 6 April, 2014 - 7:17 am
Are sites moving past communication standards originated by serial communications?
New Replies:
You all have been extremely helpful, thank you!...
Thanks, Lynn! I'll be sure to take a look at those. Understand about the mesh, but so far the...
By Lynn August Linse on 9 April, 2014 - 9:58 am -
> Lynn, if I read your post correctly, you're saying there are standalone RS485 radios, not...
> This may be crazy talk, but are there sites that implement wireless Ethernet/Modbus? I'm...
By Lynn August Linse on 8 April, 2014 - 9:55 am -
>This may be crazy talk, but are there >sites that implement wireless Ethernet/Modbus? ...
This may be crazy talk, but are there sites that implement wireless Ethernet/Modbus? I understand...
By Lynn August Linse on 7 April, 2014 - 10:23 am -
Actually, if I view this as the more narrow question of serial-vs-Ethernet, I could paraphrase a...
By Lynn August Linse on 7 April, 2014 - 9:37 am -
Adding to what Curt mentioned, I think the bulk of small companies find Modbus support FAR MORE...
Topic: Communications systems and equipment.
from the Forum department...
WinConX driver (MBX driver 4.2)
Originally posted by Julio Mtz on 8 April, 2014 - 9:46 am
I need the WinConX driver (MBX driver 4.2) to install an old PCI-85 card
New Replies:
Contact your local Schneider Modicon representative. They might be able to give you a complimentary...
Posted by Automation1971 on 5 April, 2014 - 4:01 am
Is there a simple Device to send multiple digital Inputs to a Modbus Slave Register?
Topic: Software, including programming, OS issues, etc.
from the Forum department...
Problem in Modbus Master Simulation Tools
Originally posted by Rupak Shrestha on 4 April, 2014 - 4:26 am
I'm having problem to communicate over Modbus RTU and TCP/IP frame with my computer using free softwares such as Simply Modbus Master 7.1 and TCP Client 7.1, and Modbus Poll.
New Replies:
It sounds like you just don't have a connection. RS-485 has some issues. The A/B or (+)/(-)...
By Lynn August Linse on 4 April, 2014 - 11:50 am -
Well, if 3 different test tools don't work, a fourth wouldn't work either. So one of these is...
>>...with the Simply Modbus software, I'm not able to get the response from the slave device....
Topic: Local and wide area networking in factory automation.
from the Modbus department...
Modbus over GPRS
Originally posted by Antonio Mota on 16 September, 2013 - 11:11 am
Retrieve data from MODBUS energy meters remotely using GSM GPRS.
New Replies:
Hi Antonio, The GT-540 (2G) and GT-540-3GWA (3G) are Modbus RTU device servers that allow you to...
Topic: Communications systems and equipment.
from the Sending control words to the drive department...
Altivar 12 control via Modbus
Originally posted by TeaMan on 8 February, 2014 - 10:49 pm
Unable to send control or speed signals to my Altivar 12 drives from Mach 3 software on a PC.
New Replies:
Maybe you have the same problem as i did; please see http://modbus.control.com/thread/1396077823...
Posted by Sara on 27 March, 2014 - 12:03 pm
Please read the text for full information. The attack codes I am talking about are for DoS and Injection attacks.
Topic: Software, including programming, OS issues, etc.
from the Electrical & Instrumentation department...
Unable to load DTM of HART Field Transmitter
Originally posted by Hoa on 24 March, 2014 - 11:02 pm
The Preventive Maintenance Server can not access Rosemount HART protocol transmitters
New Replies:
Hi David Thank you so much for your valuable prompt. Our PMS server is configured with Factory...
> all the field transmitters are losing the DTM Wrong. The field transmitters can function...
Topic: Local and wide area networking in factory automation.
from the Forum department...
MODBUS slaves
Originally posted by Prem Sanil on 20 March, 2014 - 1:18 am
Modbus allow only 247 slaves
New Replies:
By Lynn August Linse on 21 March, 2014 - 9:57 am -
> Why does Modbus allow only 247 slaves to be connected to the same network? Keep in mind...
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