Questions tagged [plc]
Programmable Logic Controller
279
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How may I manually construct CAN message for CANopen?
I understand CANopen uses CAN, the difference is usage and message type. I have basic CAN capable device and I want to control industrial motor controller, which uses CANopen.
I have its EDS file, but ...
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3
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91
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Convert 0-10V signal to 0-20mA (PLC)
I am designing at the time a process in which we will use a PLC to control some valves and mass flow controllers. The PLC we have has an input module for 0-20 mA. One of our sensors (flow measurement) ...
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XTR111 4-20mA/0-10V before mux stage
I am currently designing a PLC-like module based on a STM32 microcontroller. I want to have up to 8 analog outputs generating 0-10V or 4-20mA signal. I am heavily relying on this design by TI: https://...
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PLC delta DVP28SV controls maximum how many servo axes
I want to use PLC DELTA DVP28SV11T to control 6 servo motors but I can only control 4 motors. When using the 10khz output pulse at Y10 and Y13 to control the 5th servo motor, it cannot run. How should ...
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PLC is 2 - 5 VDC and relay works only at 16 - 24 VDC?
I got a panel where the PLC output has 2 - 5 VDC and the relay connected to it says 24 VDC, it will not work below 16 VDC. What's the deal here, aren't PLCs usually 5 VDC? Was the PLC supposed to be ...
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Transmission of the signal from the Hall sensor to the PLC
I would need help with my application for counting impulses sent from a Hall sensor. Below is the description of the application.
In the project, I have a 2-pin Hall sensor powered by +13VDC. ...
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Arrangement of isolated variable DC input
I design isolated DC input for industrial applications that can possibly work from 12 to 24 V.
I add a 5.1 V Zener for over-voltage protection, a capacitor for filtering, and TVS for surge production.
...
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How does online code editing work in a PLC?
Some PLCs, such as Allen Bradley CompactLogix, allow "online" changes to be made to the running program on the PLC. These changes are (almost) instantly applied and don't require the PLC to ...
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Data availability on a HART device network configured for multi-drop mode
We have 2 flow meters on an equipment installation that are HART-capable. As they are installed today, configuring these devices in multi-drop mode would be much easier than running additional wire ...
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Control cabinet rules
I am building an electrical enclosure box equipped with a smart relay (PLC) and containing a 60W 24VDC power supply which is supplied from 230V AC. The PLC controlles a small 15W DC motor and ...
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148
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Twisted pair wiring 4-20 mA sensor
I have a pressure sensor with 24 V, GND and 4-20 mA signal output pins. It will communicate with a PLC. I will only use 3m of wire max. for each pin. The installation will be on the rooftop maybe a ...
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Difference between interlock and permissive
There seems to be somewhat differing and sometimes overlapping definitions of these terms. Below are definitions found in The Automation, Systems, and Instrumentation Dictionary, Fourth Edition by ISA....
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123
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DIN rail terminal block resistor
Is there a reliable solution for placing my own through hole resistor into a DIN rail mountable terminal block? Or is there any off the shelf solution the use a resistor to convert my 4-20mA current ...
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3
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215
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4-20mA analog output into a digital input?
I'm measuring the 0-10V pressure output of a pressure sensor with a LOGO! smart relay (PLC). I would like to make sure that the pressure sensor is working even when I'm measuring nearly zero values ...
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102
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How do I take a 24 volt DC 10-30 kHz PWM signal from a Click Plus PLC and convert it to a 5 volt DC PWM signal to control a pump?
I am working on a small dose spraying system for a farming application. I have a Click Plus PLC, part number C2-01CPU-2, and it has one IO card so far, a C2-14D2. I want the PLC to control a Kamoer ...
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Runtime display for last 24 hours
I'm working on a BRX PLC connected to a C-More HMI. I'm using Do-More Designer to write ladder code. I'm looking for ladder logic that will give me the runtime of a circulating pump in the last 24 ...
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189
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Interfacing Delta PLC and Arduino (Logic Signals)
I am trying to connect a Delta PLC (DVP-10SX) to an Arduino UNO. What I'm trying to achieve here is to be able to exchange Logic signals between both the PLC which has a logic level of 0-24V and ...
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115
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Connecting every other DIN terminal to each other
I am building a custom panel. My output DIN terminals are supposed to be in this order: Power, Ground, Power, Ground, Power, Ground.... I cannot find a proper way (jumpers or bars) to connect them. ...
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2
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Does it make sense to look into the voltage and current of the power supply for my PLC controller?
The power supply of the PLC controller I am working with (X20PS9600 to be precise) has internal readings into software for the current and voltage it is delivering. I am not sure about the purpose of ...
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290
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Reading 4-20 mA industrial pressure sensor
I am trying to read an industrial pressure sensor (datasheet) with range 0-10 bar and output 4-20 mA, with an Arduino Opta RS485, powered from an external 12 VDC source.
Leaving the sensor in the air,...
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How to Drive a 50uA Panel Meter with a PLC Running 24v Inverted PWM Signal
Full disclosure, I am not an engineer of any kind. Just an electronics enthusiast.
I have a Barth 850 micro PLC that needs to operate at 24v, and has one PWM output. I also have a 50uA panel meter ...
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49
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Using both safety PLC and safety relay
I am in the process of designing a robotic cell. This contains a safety door and several e-stops. I want to use the safety PLC from siemens S7-1200F. I need to have two roller tracks with 8 24V motors ...
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190
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Using the PLC output to mimic a NPN sensor as the input to a device
I got a device which has a connection to a NPN proximity sensor, it'll do something when the sensor is being trigged.
Now I remove the sensor, using a PLC(24vdc) to do the job of sending the signal to ...
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3 wire and 4 wire wiring configuration in PLC [closed]
I need some clarification on 3 and 4 wire connection.
In the 2/3/4 wire system, Is the PLC must to provide power to the transmitter or transmitter is powered by the external supply.?
Please clarify ...
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95
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How does deceleration work on a servo drive?
I'm confused by the fact that PLCopen MC-blocks used to control servo drives from a PLC have separate acceleration and deceleration parameter. For instance, MC_MoveAbsolute.
I don't understand what ...
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1
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53
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How to drive 0-85mA proportional solenoid valve with WAGO PLC 4-20mA or 0-10V?
I am looking to use an SMC PVQ valve. I need to drive it using a WAGO PLC. Common modules for the WAGO PLC are 4-20mA and 0-10V. How can I do it using these or any other module/method?
Very little ...
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37
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Driving multiple VFD controllers using collected data
I have a LoRaWAN sensor network that I setup which collects temperature data from multiple compost stacks and stores it in a database on the local network. I need to convert that data into an output ...
- 101
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111
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If you autotune a PID while the controller is live what is the worst that can happen?
I am new to using PID in studio5000. I want to autotune a heater with a CV that stays at 100, never reaching the SP but just under it.
I think that might help the controller finally reach the SP.
What ...
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71
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DC motor set to 0.25 RPM pulling -5 Amps at nearly 20% torque - Why the heck is it doing this?
Drive controlling the motor: PowerFlex DC Drive, 460 VAC, 3 PH, 27 Amps, 15 HP/11 kW, Regen, IP20, NEMA/UL Type Open, No HIM (Blank Plate), User Manual, No Communication Module, A Frame
Motor in ...
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How can I identify this component on a PLC board that has gone bad?
How can I identify this component on a PLC board that has gone bad? Surface mount, unidirectional, G is the designator, 060 (090?)
It measures as an open circuit with a multimeter on a bad board and ...
user298907
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54
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Meaning of nom. voltage for terminal blocks
If the nom. voltage of a terminal block is i.e. 500 V, will it still function properly with only 24 V? For example this one: PT 1,5/S-QUATTRO - Feed-through terminal block
For a project I need ...
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1
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140
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Incremental Encoder problem
I have a problem is that it is not possible to specify the direction of rotation in the encoder. Refer to it as in the attached picture.enter image description here.
The problem with the selection is ...
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432
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Right Way to Step Down a PWM Signal
I need to control 4 servos using a PLC that operates with 24V. The problem is that servos use only 5V. To accomplish this, I built a simple circuit using some 7805 and a large 1000 µF capacitor to ...
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285
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How can I improve my ladder logic diagram of a vending machine?
I am trying to create a coffee and tea machine using a ladder logic diagram. There are small, medium, and large sizes. This is where I am now:
Can you give me any ideas or corrections on how to ...
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330
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How does the incremental form of the PID controller work?
I have a question regarding the features of the so called incremental (velocity) form
of the PID controller. As far as I understand this form in correct manner it can be
described via this pseudocode
<...
- 1,113
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301
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Split supply from 24V power supply using uA741 opamp
I want to connect a 0-3V analog sensor output to the 0-10V analog input of a PLC.
In order to avoid losing resolution, I have amplified the sensor signal using a non-inverting amplifier circuit (based ...
- 407
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SPI signal noisy when contactor switches
I created a Raspberry Pico based PLC board which worked perfectly alone, however once I placed it into a distribution box and started switching a fairly large (7.5kW) contactor, the on-board seven ...
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How to improve ADC reading accuracy from 1mV to 0.1mV or better
I want to read a DC voltage from a battery with 0.1mV resolution or better and send the value to a PLC based in Arduino Mega. I selected an ADS1115 (datasheet here) which has enough resolution to do ...
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1
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247
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How to calculate the cut-off frequency of a software average filter
I want to read the voltage of a battery using an ADC connected to a PLC. The signal oscillates a bit and I want to smooth it. The ADC samples the signal at 860 samples per second and stores it in ...
- 407
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212
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PLC output optoisolation with mosfet output
I'm wondering if this circuit i've made is correct.
Basically i want to separate PLC transistor outputs from loads.
I need 500mA output current for LEDs but also for relays etc.
PLC and loads are ...
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Is it good engineering practice to share two different 24 VDC SMPS's neutral wires?
Is it good engineering practice to share two different 24 VDC SMPS's neutral wires?
I work in manufacturing with Toshiba extrusion machines which are controlled by PLCs. Our management wants to add a ...
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Can I read the voltage (MCU ADC) with an isolated power source by opamp inputs?
I made a conceptual design to read an industrial 2- or 3-wire temperature sensor with a single 3-connection terminal.
I used an opamp in differential mode to read two terminal connections which are ...
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464
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24V I/O (PLC) to 3.3V interface with opto and PCF8574
I am more of a software guy, and I want to make sure my design works before sending it off to fabrication.
I need to interface with 24V PLC I/Os. I want a simple design for now, as I can add ...
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1
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287
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Using 0-3 V sensor with 0-10 V PLC
I have a sensor that generates an analog 0-3 V output signal. I would like to connect this sensor to a PLC which has only 0-10 V analog inputs.
My questions are:
Is this recommended to do in general? ...
- 407
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2
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852
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Algorithm for converting a 128-bit value to a string
I am trying to convert 128-bit data to a string in a PLC, but the PLC has max. 32-bit data. I store 128-bit data as a byte array and bit array. Now I need to convert this value to a string, but the ...
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What SMD component is this?
Can anyone please help me to find what SMD component this is?
It is connected to 24 VDC on one side side (positive) and the other side to negative.
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How I can read a 5 V input state correctly with an Arduino?
I want to read the output of a PLC with an Arduino. If the PLC sends a HIGH (5 V) on a OUTPIN, the Arduino should read this HIGH, else LOW. I am generally using this code for this:
...
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RDS - PLC wires
I'm an American but I'm changing some of my drawings to RDS (Reference Designation System) to make these drawings more similar to the drawings of equipment that keep coming in.
What is the proper ...
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Using an optocoupler to separate a 4-20 mA loop
I have a PLC that is powered with 3.3 V and a sensor powered with 12 V that outputs a 4-20 mA signal. In order to allow the signal to be readable by my PLC while isolating the current in the 12 V loop ...
- 53
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561
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Problems running 110 V and 24 V PLC signals in same cable
Has anyone encountered issues running analog signals that are 110 VAC and 24 VDC together in the same cable on the way to their PLC inputs?
Let's imagine each signal could be like 100 mA. I know with ...
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