basic differences between contactor and relay?
By guy reece on 25 April, 2015 - 7:54 am
in all practical terms a relay and contactor perform the same basic role - switching current to a...
Interfacing GSM module with matlab
My aim is to send SMS using GSM module by interfacing with matlab
By Sam on 25 April, 2015 - 4:11 am
were you able to perform it? if yes, please help me in interfacing the gsm module with matlab....
Wiring a Servo Motor LT to terminate in DCS but also connected to local indicator.
4-20ma Read to 2 AI Devices
Posted by John Nguyen on 20 April, 2015 - 5:13 pm
Split 4-20mA signal of a sensor to 2 AI device
By Roy Matson on 21 April, 2015 - 2:36 pm
> Paralleling the 4-20mA will not work. Perhaps I should have been a bit clearer. The...
By Roy Matson on 20 April, 2015 - 7:17 pm
You have several options. If the analog inputs are isolated, just wire in series. If they are not...
HINET Modbus DDE SERVER 2014
HINET ModBus DDE SERVER 2014,
Combining Wires in Conduit
What guidelines or resource do you use to decide what cables are OK to combine in a conduit or cable tray?
By Roy Matson on 17 April, 2015 - 5:26 pm
I think NEC section 16 is pretty clear, 16-212 in particular. I can't find it at the moment, but...
By Fel Flores on 17 April, 2015 - 1:57 am
can you tell me the particular part of the code that states you can combine a low voltage and...
Low Air Flow Confirmation
Looking for sensor to confirm low air flows
By Roy Matson on 17 April, 2015 - 6:37 pm
Paul, I edited your post to get at the salient points You indicated the pressure switches may...
Understanding speed control of BLDC motors that are NOT wired for PWM.
By Curt Wuollet on 14 April, 2015 - 12:12 am
You can certainly do PWM with a 2 wire load. Considering that PWM varies the average voltage, at...
Looking for a Scheduling Application with MODBUS Addressing
Scheduling/ Signalling Application That will work with MODBUS (or with discrete I/O)
Difference between a DCS and a PLC
What are the key points of differences between a PLC and a DCS
By rvsaradhi on 11 April, 2015 - 10:11 am
Hi , Function of DCS is for data acquisition/trending, process control loops group, history of...
By pvbrowser on 11 April, 2015 - 3:20 am
Forget about all the buzzwords. The terms PLC or DCS have mainly historical roots. But today...
Calculate the Speed of Conveyor.
Calculating the speed of a conveyor belt, using Allan Bradley Powerflex 40. Converting Hz to km/h.
By Chapman Industries on 9 April, 2015 - 3:00 pm
Interesting thread! Check out www.hydraulicandpneumatics.com for hydraulic and pneumatic products....
Instrument Loop Voltage Too Low
Instrumentation loop power control issue.
Activating a Solenoid 2500 using a 24 VDC Solenoid
Posted by SAMMY MARTINEZ on 4 April, 2015 - 10:18 am
need to activate solenoid 2500' away. What is required a 24vdc solenoid or a 120vac solenoid?
By Curt Wuollet on 6 April, 2015 - 11:22 pm
If it's all indoors and on the same electrical system, I'd maybe run the wire. If it's outdoors,...
By Roy Matson on 6 April, 2015 - 4:34 pm
> need to activate solenoid 2500' away. would a 24vdc solenoid work or would i need a 120vac...
By Bob Peterson on 5 April, 2015 - 10:52 am
crunch the numbers and see what the voltage drop is. personally, I would be looking for a better...
By Steve Myres on 5 April, 2015 - 2:41 am
I think you dropped a zero or something there. You certainly don't need a wrist-sized conductor to...
Effect of the Weights in an LQR/LQG Problem
Given a performance index (PInd), and a fixed weight (Q) on the states, how can I design an LQG controller such that the input is less noisy and yet PInd is minimal?
Rotor Angle Measurement Using Proximity Sensor
Need help understanding how to measure rotor angle using single inductive proximity sensor and speed signal which is also measured using proximity sensor.
Woodward 4024 Actuator Model 8256-060 Testing/Repair
Obsolete Woodward 4024 Actuator Model 8256-060 Testing/Repair
By Tim Hinde on 1 April, 2015 - 11:30 pm
Have you checked the resistance of the actuator? It is a very low resistance typically 1-2 ohms. If...
Difference between NPN/PNP Sensors
Alternative for LEUZE BCL300I Scanner
Alternative for Leuze make barcode scanners
Open Source Web Based SCADA
Looking for a reliable open source web based SCADA software.
Wind-Up Applications Using Brushless DC Motor
Question regarding the control of a wind-up reel on a label applicator with no sensors other than those contained in the motor.
MODBUS Comunication with RS485 on ST-200
Communication between PLC and PC via Modbus, using a network interface to transport the rs485 via TCP/IP.
By Roy Matson on 27 March, 2015 - 4:26 pm
I'm not familiar with the hardware you are trying to use however I have done a lot with RS-485 in...
Dry Contact and Hermetically Sealed Switches
Where does one need to use a dry contact switch and when do you need to use a hermetically sealed switch?
By Roy Matson on 26 March, 2015 - 3:13 pm
First of all NEMA 4 X is not explosion proof, you need NEMA 7 for that. IP 66 refers to the...
Drum level control by two element
What is cascade control & explain two element in simple language?
By Shajan on 26 March, 2015 - 4:56 am
How can you implement 3 element drum controller using PLC PID logic? I have a project that needs...
I need to learn how to operate and use PLCs
By tommy van de pol on 18 March, 2015 - 4:00 pm
maybe the starter of this topic can give some extra information about what level of programing he...
By rensklijn on 18 March, 2015 - 6:04 am
I have to agree with K93F. I think a LOGO PLC from Siemens is advanced enough if you have 0...
By TpB on 18 March, 2015 - 4:41 am
1200 plc has some benefits against the LOGO. The s7-1200 is more expandable, more options and I...
Using Remote Seal Level Transmitter in Evaporative Tank
Posted by Joemari Carpio on 23 March, 2015 - 6:41 am
Can I use emote seal type level transmitter to measure level of sugar in evaporator tank?
Communication Issue, Banner DX80 & Rockwell Micro 820 PLC
Posted by Charles Casalie on 13 February, 2015 - 11:45 am
Issue establishing Modbus RTU link between Rockwell Micro 820 PLC & Banner DX80 Gateway via RS-485 connection.
0-5k ohm or Hall Effect Sensor on KNX or MODBUS
Trying to find a device that will read a 0-5k ohm signal or a hall effect signal from an encoded motor