from the maintenance department...Process Switches NO NC definition
What "normally" means in process switches.
By N.A. on 11 April, 2014 - 1:51 am -
Dear Sir, Normally means then initial condition of any switch or relay without pressing or...
from the Instruments Department department...Modbus Max. Length
Measure the total Modbus Length
By Curt Wuollet on 10 April, 2014 - 9:31 pm -
No that's a star and it's a bad idea because 20 M of unterminated cable will give you reflections...
By Franco Kew on 10 April, 2014 - 5:43 am -
Dear CWW, Maybe I use the wrong wording in my post, but I am not using the star topology. I try...
By Steve Myres on 9 April, 2014 - 1:01 pm -
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...
By Steve Myres on 9 April, 2014 - 12:00 am -
You're not supposed to run RS485 in a star topology. Not sure if short branches are officially...
By Curt Wuollet on 8 April, 2014 - 11:19 pm -
That doesn't sound like a workable configuration. 485 doesn't like star layouts. You can use...
from the Automation List department...Android tablet for HMI?
Using an Android tablet as an all in one PLC.
By Ramses on 10 April, 2014 - 2:18 pm -
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...
By Gary Reynolds on 31 March, 2014 - 4:27 pm -
Greetings, This subject caught my attention because I working on a project where we are using a...
from the Instrumentation department...communication between siemens PLC S7-400 to DCS Centum CS3000R3
Communication between SIEMENS S7-400 PLC Scalance card to Yokogawa DCS CENTUM CS3000R3
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: ...
from the Forum department...8-bit data types in Modbus registers
Are 8-bit data types obsolete for Modbus?
from the Forum department...Flow Rate Calculations S7-1200
Flow Rate Calculations S7-1200
from the Urgent department...Time and Date in Honeywell control builder
How could use time and date in control module?
By Robert Perez on 9 April, 2014 - 9:05 am -
Hi Mostafa, you could get the hour, minute and second variables from the CEE under the...
from the Forum department...2oo3D voting
Explain if 1oo2D voting is just similar to 2oo3 voting for ESD system.
Let's start with your requirement of tripping of valve on rise of line pressure beyond high limit....
from the HC900-C70R department...Split Range Control on two valves - HC900-C70R
Split Range Control on two valves - HC900-C70R
The pressure transmitter is the input to an analog input function block. Its analog value is the...
from the Forum department...WinConX driver (MBX driver 4.2)
I need the WinConX driver (MBX driver 4.2) to install an old PCI-85 card
By Benoit on 8 April, 2014 - 2:26 pm -
Contact your local Schneider Modicon representative. They might be able to give you a complimentary...
from the Over the Cliff department...Siemens S7 programming
Siemens S7 programming
By JC on 6 April, 2014 - 8:10 pm -
I take issue with this assessment. Take your example of C vs Visual Basic. There's a dramatic...
from the Instrument department...ABB Thermocouple Transmitter reading fluctuates
Transmitters reading Fluctuating
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...
By hanafy on 31 March, 2014 - 10:25 am -
Hi, I assume the TC's are directly connected to certain thermocouple module. 1-this problem...
msalem73, David asks MANY good questions. But perhaps the best question is: When did this...
By d- on 29 March, 2014 - 2:10 pm -
check the resistance of the rtd's. you should be able to get a direct reading of the temperature...
1) What is an example of a 'good reading', for example, 215 Deg C? 2) What is an example of a...
from the Forum department...Tri-Sen analog output low
Tri-sen TS 310 controller that doesn't want to output a full 20 ma signal
By Curt Wuollet on 31 March, 2014 - 11:40 pm -
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...
from the Forum department...Square root extraction in DCS
Square root extraction in DCS
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.. ...
from the Forum department...Modifying a timer - SLC 504
Having an issue finding where a source comes from in a MOV command.
> Does the PLC have a memory module installed? > If it does, you will have to save the...
Since you have no programming that changes the value of register N21, it seems likely that there is...
Does the PLC have a memory module installed? If it does, you will have to save the change to the...
from the Senior Controls Engineer department...IDEC PLCs
Forum reader is pro-IDEC PLCs. Training session in Houston in April
from the Forum department...TwidoSuite v2.3 interface with CitectScada v7.3
Equivalent register address of PLC to SCADA
from the Automation List department...Comparing PLC and DCS
I am new in the field of automation. Could anybody tell me the difference between PLC and DCS other than I/O handling capacity?
By Iqbal Raza on 27 March, 2014 - 1:54 pm -
People are still giving answers because many users still don't know the differences between a PLC...
from the Forum department...Modbus RTU (Client/Server) to Modbus RTU (Master/Slave)
Please read the text for full information. The attack codes I am talking about are for DoS and Injection attacks.
from the I&C department...ATEX Ex ic or ATEX Ex nA ?
ATEX Ex ic or ATEX Ex nA ?
Hi, Normally from technical point of view it is required unification of solution. So if you use...
from the Automation List department...So What did I use the Clicks for?
Real world example of using the Koyo Click PLC
By Curt Wuollet on 26 March, 2014 - 11:24 am -
> Don't really care for the Clicks (although ADC's new Do-More PLC is a > fantastic product...
By Steve Myres on 25 March, 2014 - 10:25 pm -
Don't really care for the Clicks (although ADC's new Do-More PLC is a fantastic product except for...
from the Forum department...File Handling through Micro Controller
Using Micro Controller to do file handling on a PC
> Presently able to do communication with Hyper Terminal (Micro Controller > connected to PC...
ya i know through Linux is less complicated to achieve this, but my Application needs to do this...
Everything should be built top-down, except the first time.