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Control.com topic...
PLCs
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:
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 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: PLCs and related questions.
from the Urgent department...
Time and Date in Honeywell control builder
Originally posted by Mostafa on 8 April, 2014 - 2:48 pm
How could use time and date in control module?
New Replies:
thank you so much sir but unfortunately i couldn't find variables CEE1.HOUR...... i have many...
Hi Mostafa, you could get the hour, minute and second variables from the CEE under the...
Topic: Communications systems and equipment.
from the Forum department...
8-bit data types in Modbus registers
Originally posted by Jay on 10 April, 2014 - 5:26 am
Are 8-bit data types obsolete for Modbus?
New Replies:
By Lynn August Linse on 14 April, 2014 - 10:39 am -
A bit of historical trivia... Modbus never had 8-bit data types. The original PLC were made back in...
> Since registers are always 16 bits, does it even make sense to provide data types of 8 bits...
Topic: Power generation equipment control.
from the Engineering department...
Siemens marshaling wire
Posted by Raymond Mpofu on 14 April, 2014 - 8:16 am
Brand name of Siemens' 0.5mm thick marshaling wire
Topic: Software, including programming, OS issues, etc.
from the Annoying Exceptions department...
Negative Acknowledge and Bad Karma
Originally posted by Julie in Austin on 18 February, 2012 - 2:05 pm
How do you feel about security exceptions not being, you know, informative?
New Replies:
> What product are you working on, and are there any other security enhancements you are making?...
Topic: Communications systems and equipment.
from the Automation department...
DCS Yokogawa Communication Issue
Posted by Zarar on 13 April, 2014 - 2:21 pm
Yokogawa DCS communication with Modbus slave device using ethernet redundant connection with ALE111.
Topic: PLCs and related questions.
from the Automation List department...
Interfacing VFD with PLC
Originally posted by Anonymous on 29 May, 2007 - 9:09 pm
How to interface variable frequency drives with PLCs?
New Replies:
If You Want only on/off control from PLC, then connect the drive to digital output module. and if...
Originally posted by andyt76 on 24 July, 2012 - 7:19 am
Connecting a Honeywell UDC temperature controller to Modicon PLC via Modbus. any ideas on this?
New Replies:
Latest edition of Honeywell's Modbus RTU communications manual 51-22-25-66, Rev T, dated February...
Topic: Sensor technologies.
from the maintenance department...
Process Switches NO NC definition
Originally posted by Normally on 19 August, 2011 - 7:12 pm
What "normally" means in process switches.
New Replies:
Dear Sir, Normally means then initial condition of any switch or relay without pressing or...
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:
No that's a star and it's a bad idea because 20 M of unterminated cable will give you reflections...
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...
Topic: Human-Machine Interface and SCADA.
from the Automation List department...
Android tablet for HMI?
Originally posted by Ken E on 3 June, 2011 - 11:18 am
Using an Android tablet as an all in one PLC.
New Replies:
Hello, I found a very good free apps for android and IOs devices (Iphone, Ipad) that is a SCADA...
Gary, I've got a powered USB 4-port hub connected to my Nexus 7. I would think such a device...
You need to connect the power supply lines in the USB connection to a high-current source that can...
Greetings, This subject caught my attention because I working on a project where we are using a...
Originally posted by V K GUPTA on 9 April, 2014 - 12:34 pm
Communication between SIEMENS S7-400 PLC Scalance card to Yokogawa DCS CENTUM CS3000R3
New Replies:
you need to use Siemens CS-3000 module to convert your signal to modbus TCP/IP signal and interface...
By Patrick Lansdorf on 10 April, 2014 - 2:17 am -
Hi, I am guessing that the PLC is a Profibus master... You can use a gateway, such as: ...
Topic: PLCs and related questions.
from the Forum department...
Flow Rate Calculations S7-1200
Posted by shahien on 10 April, 2014 - 3:40 am
Flow Rate Calculations S7-1200
Topic: Continuous process industries, DCS questions.
from the Forum department...
2oo3D voting
Originally posted by amanemisa on 8 April, 2014 - 3:54 am
Explain if 1oo2D voting is just similar to 2oo3 voting for ESD system.
New Replies:
Let's start with your requirement of tripping of valve on rise of line pressure beyond high limit....
Topic: Continuous process industries, DCS questions.
from the HC900-C70R department...
Split Range Control on two valves - HC900-C70R
Originally posted by Frederik on 8 April, 2014 - 7:45 am
Split Range Control on two valves - HC900-C70R
New Replies:
The pressure transmitter is the input to an analog input function block. Its analog value is the...
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...
Topic: PLCs and related questions.
from the Over the Cliff department...
Siemens S7 programming
Originally posted by Bapi on 1 April, 2006 - 5:18 pm
Siemens S7 programming
New Replies:
I take issue with this assessment. Take your example of C vs Visual Basic. There's a dramatic...
Topic: Sensor technologies.
from the Instrument department...
ABB Thermocouple Transmitter reading fluctuates
Originally posted by msalem73 on 29 March, 2014 - 6:42 am
Transmitters reading Fluctuating
New Replies:
Okay, You answered some of the questions. Have you checked the thermocouples in the stack to...
first off all i am sorry for writing down transmitter model is ABB TH02. the answer of your...
Hi, I assume the TC's are directly connected to certain thermocouple module. 1-this problem...
Topic: PLCs and related questions.
from the Forum department...
Tri-Sen analog output low
Originally posted by JoeFin on 31 March, 2014 - 6:12 pm
Tri-sen TS 310 controller that doesn't want to output a full 20 ma signal
New Replies:
Possibly a compliance voltage issue? If the load is too light for some reason there isn't enough...
Page 40 of the TS310 User Guide states that the voltage driving the output is 7 volts and that an...
Topic: Sensor technologies.
from the Forum department...
Square root extraction in DCS
Originally posted by oruam on 21 December, 2009 - 6:35 am
Square root extraction in DCS
New Replies:
By hemantkumar chauhan on 31 March, 2014 - 9:44 am -
Okay I am not your ones right or not.. but I have my own .. Let me explain it.. ...
Topic: Communications systems and equipment.
from the Forum department...
Modifying a timer - SLC 504
Originally posted by Don Leathers on 28 March, 2014 - 4:29 pm
Having an issue finding where a source comes from in a MOV command.
New Replies:
> Does the PLC have a memory module installed? > If it does, you will have to save the...
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