solid state relay parallel operation
Posted by cem ayday on 30 July, 2004 - 2:28 pm
is it possible to wire in parallel two or more SSRs to have more current for ac switching application?
By Anonymous on 3 August, 2004 - 11:32 pm
I had tried to use 2 40ADC SSR (Cryden) to control 80ADC. But I don't know it can be used in AC...
AC voltage to current converter
Is there some standard circuit I can find on the net that converts an AC voltage from a function generator to constant current?
By D Brown on 3 August, 2004 - 11:32 pm
I built a cct that takes the input of a AC current probe across a resistor (AC voltage) into a...
What is the best dcs solution for a petrochemical plant utility?
I want to post some questions about shielded cables uesd either for control or for power connections.
Electrical wiring color code standards
Posted by Larry Grayson on 3 August, 2004 - 4:05 pm
Looking for color standards for control wiring.
By Matthew Hyatt on 3 August, 2004 - 11:26 pm
For all of the UL listed panels I have worked on, designed and such I used the following: Black...
By Verhappen, Ian on 3 August, 2004 - 9:54 pm
This thread has been posted before and includes reference to several international standards. ...
Trying to access the main menu of the control station TR130
By Jeff on 3 August, 2004 - 11:22 pm
From what I recall, the TR130 had a hardware based operating system. Email me if you still need...
Can anyone tell me how to get network blocks to switch from STL to Ladder logic
mass flow rate measurement help
By Standard Plan on 3 August, 2004 - 11:22 pm
Inexpensive DP devices can be used such as an orifice or flow nozzle. With a little electronics a...
can anyone help me with the detection of the presence of iron bar?
By Alvaro Mola on 3 August, 2004 - 10:00 pm
Canīt you use an inductive sensor? The diameter of the sensor gives you the detection distance. ...
PLC software for Mitsubishi PLC
Just fooling around with various PLCs
By Steve Myres on 3 August, 2004 - 9:55 pm
Monti, If you contact the distributor from whom you purchased the software and they have a...
By Laddie R. Boone on 3 August, 2004 - 9:37 pm
The cable you're looking for is SC09. It contains a RS232/RS485 converter and ends with a mini-din...
Does anyone know of where I can download a stencil for Visio which gives SAMA symbols for functional diagramming of instruments and control systems?
By Dave on 3 August, 2004 - 9:50 pm
Went to the cafe and didn't find anything that resembled the symbol set... regards...
Optical Measurement of a Tinting Process
I would like to measure the optical transmission of tinted plastic panels during a hot-water tinting process.
By Robert Scott on 3 August, 2004 - 9:48 pm
If the panels must be measured while submerged in the dye, then you need to take into account the...
By dooley on 3 August, 2004 - 7:27 pm
Inverse square law doesn't apply to a collimated beam so that is easily overcome with lenses. ...
Program is too big and growing...
By Glen Boston on 3 August, 2004 - 9:40 pm
Thanks for the info guys. I'm still not clear how to view actual memory usage. If I look at...
Indirect addressing on Modicon Quantum Using ProWORX NxT
Is there a indirect addressing syntax that I'm not aware of.
By Anonymous on 3 August, 2004 - 9:40 pm
Got it figured out using one network and a few T->R BLKM and SUB blocks. About the indirect...
What to companies do with their obsolete S5 PLCs?
By Laddie R. Boone on 3 August, 2004 - 9:48 pm
There are a great many PLC's on the ebay site. Just about every brand is represented, but I...
RS485 half Duplex Communication
Need help in setting up serial port for RS485 half duplex communications
Can anybody suggest a signal conditioner which can convert up to 1000 A to 4-20mA signal?
By Nick on 3 August, 2004 - 9:30 pm
Take a look at: http://www.currentmonitoring.com There are a lot of options (single/multi...
How to use VB for programming
I need some advice on how to use VB to program hctl1100 controller to run a dc motor... 10x!
Need the configuration software for SLC 5/03 from AB as I have to execute a project and would like to train myself and the team before purchasing...
By Anonymous on 3 August, 2004 - 9:25 pm
I have seen it on Ebay.com from time to time. Do this instead of paying allen-bradley's ridiculous...
By marc sinclair on 3 August, 2004 - 4:34 pm
Hi, The 5/03 is a very old, and (especially outside the usa) over-priced plc, If it is a new...
Established comms - can't work out alarms!
Modicon PLC 984-145 and Communications
I need to communicate remotely [modem] with a modicon 984-145 CPU
By Anonymous on 3 August, 2004 - 9:20 pm
Hi There, I'm back again with another query on the above. In the modsoft topic Config, Ports,...
I have a need to do some isolated temperature data logging. Since I have available an I-PAQ pocket PC, I would like to use it as the data collector.
By Bill James on 3 August, 2004 - 9:10 pm
Thanks for the thoughtful response. I prefer the PLC approach, but in a hospital environment the...
Need tool for testing Modbus/TCP functions
I am making a proximity sensor for my GCSE project. I need suggestions on how to do this but I prefer it if it is simple
By j naidu on 3 August, 2004 - 7:38 pm
hi you can use either an ldr or a photo diode or photo transistor to have a non-contact...
i am trying to implement a DCS using 89c51 and a pc.
transformer unbalance voltage
what may be the reasons for unbalance voltage in transformer secondary side?
By Anonymous on 3 August, 2004 - 7:30 pm
its a furnace transformer with 10 taps and voltage is from 250 to 400v.phase to phase voltage dont...
Modicon PLC training for maintenance personnel
By Brian Cervi on 3 August, 2004 - 7:27 pm
Have you contacted the Schneider Electric office in Lagos? Biro Plaza 8th floor. Plot 634...
Passing a UDT/Struct to a FC/FB in Siemens S7
I have an application where I have an FC with a UDT as in input parameter. When I call the FC I cannot seem correctly pass the structure to the FC.
I am on a new equipment installation and we are using an Allen Bradley 845G Absolute 10 bit Gray Code encoder connected to a 1794-IV16 24VDC Sourcing Flex I/O Input Module talking thru ControlNet to a ControlLogix PLC...
By William Sturm on 3 August, 2004 - 7:25 pm
One problem is that the inputs are not fast enough. They probably have some sort of RC filter on...
Proportional valve and PWM
Posted by Alfred Tang on 20 May, 2004 - 12:06 am
Proportional valve and its controller
By Anonymous on 3 August, 2004 - 7:21 pm
If you will use PWM higher frequency (10 kHz or more) that will make as equivalent to analog...
Data Trender/Historian/Web access
Low cost software for trending/data logging/web access
By Tim Donaldson on 3 August, 2004 - 7:21 pm
You should take a look at GENESIS32 from ICONICS. This HMI package is a robust OPC client and...
Embedded systems training
Posted by P. Samuthira Pandi on 13 May, 2004 - 6:46 pm
I want to have a training in embedded systems in India.
By Priya on 3 August, 2004 - 7:13 pm
Dear Pandi Try in Dapper Technologies,Bangalore-43 You will be able to work with the...
What good is a tailgate detector?
Posted by Brian Spaulding on 17 July, 2004 - 1:16 am
If I could sense a tailgater behind my car, what would I do about it?
By Anonymous on 3 August, 2004 - 7:13 pm
you could light your tail lamps as if you were on brakes so that the car from behind should be...
how to measure the time elapsed between the two events of the order of 0.01 microsecond from 1 microsecond to 100 microsecond?
By syurish on 3 August, 2004 - 7:10 pm
First of all it is necessary to choose a method for such measurement, than - a possible realization...
DC motor control under Linux
Timer in a c program (Linux OS)
By Jiri Baum on 3 August, 2004 - 7:10 pm
Hello, Take a look at and/or contact the Orocos and/or LinuxCNC projects - they both had to do...
I am new in the field of automation. Could anybody tell me the difference between PLC and DDC?
By Dr ir Gerrit M. van der Molen on 3 August, 2004 - 7:07 pm
Hi Piyo See this previous thread as well: http://www.control.com/1026171717/index_html ...
function codes for a hitachi hizac E series?
Posted by Bob-wd8bdn on 1 July, 2004 - 1:17 am
I have a project of updating a machine with a new PLC. The PLC currently in the machine is a Hitachi Hizac E. I don't have the software or cable and will be installing an A-B 1200 series in it.
By Terry Hutson - Your Friendly Hitachi Engineer on 3 August, 2004 - 5:02 pm
DIF 00 202 - This is the instruction used to detect a rising edge of an input. When the input of...
Modbus Plus to Modbus TCP/IP
Posted by Amir Ellenbogen on 1 August, 2004 - 12:08 pm
I Need a Hardware Protocol translator from Modbus Plus to Modbus TCP/IP...
By CH on 3 August, 2004 - 4:39 pm
Amir, ProSoft Technology has a Modbus Plus to Modbus TCP/IP communications gateway. You can...
testing Quantum hot standby!!
Siemens OPC server - latest version
Step-by-step for getting latest Siemens OPC server working correctly
How to retrieve timestamp of process tags from an OPC server through the iFix OPC client?
By Sreeni T S on 3 August, 2004 - 4:55 pm
Dear Jim, Thank you very much for your response. Further investigation from my end has validated...
Controllogix Ethernet connection to Plantscape
Posted by Paul Kelly on 3 August, 2004 - 4:49 pm
Has anyone made a ethernet connection between honeywell plantscape and a controllogix 5550 PLC?
OPC Server Chronos Richardson weight controller
Need to find a OPC Server (software) for Chronos Richardson weight controller Chrono-Tronic SpeedAC 8. It has RS-485 serial port but dont know comm protocol
By Edy Sucipto on 3 August, 2004 - 4:49 pm
Hi, I need the same information for SpeedAC 7/8. According to your web site, SpeedAC supports...
defining strategies about PLC in next five years
Communication between Modbus and MB+?
Posted by Weifeng Cao on 3 August, 2004 - 4:46 pm
Using ABB AC800M controller to communicate with Modbus Plus device
My question is: If a function generator sinusoid can be used as a constant current source. I am trying to confirm my own thoughts about it.
By T Hudson on 3 August, 2004 - 4:42 pm
Probably just being dense, but constant currents & sine waves seem to be mutualy exclusive? ...
Where can I get any info or manuals or ActiveX to connect vb to a AB PLC - SLC5/01?
I have 2 S7 315-2D. I want to connect them on a Profibus (One master one slave). I can't understand what function I should use to communicate between the 2 CPU's...
By Andrew Hawdon on 3 August, 2004 - 4:34 pm
Hi Firstly you need to configure the hardware in the hardware configuration tool of the simatic...
International Regulations for Hazardous Area Classifications
I think there is a need for International mandatory regulations for Hazardous Area Classification (HAC) on ALL International Oil/Gas Pipelines...