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Questions tagged [plc]

Programmable Logic Controller

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1answer
35 views

Produce and amplify analog signal with microcontroller (For PLC)

Overview I need to create an analog voltage of 0V-10V for the PLC with a microcontroller with operating voltage 5V. Approach I've been doing this research since last week. I'll share the results of ...
1
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2answers
55 views

Analog signal exchange between microcontroller and PLC

Overview I need to create an analog voltage of 0V-24V for the PLC ( s7-1200) with a microcontroller with operating voltage 5V. Approach I've been doing this research since yesterday. I'll share ...
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1answer
54 views

24VDC PLC with 12VDC inputs

I have a 24 VDC PLC. It is powered by a power supply that takes in 12 V and turns it into 24 V. This 12 V is coming from a car battery. The inputs for this PLC is 12 V. Here is the smart relay: It ...
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0answers
32 views

Media converter - Coax or Twisted Pair [duplicate]

I am working on a Double Leaf Bascule bridge spanning across a river that needs rehabilitated. The bridge is driven from a ControlLogix PLC consisting of 4 racks on the nearside span. Power/control is ...
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1answer
49 views

Cat 5e, any gauge?

I am working on a double leaf bascule bridge and installing a PLC I/O rack on the farside. The power transmission between the two piers (nearside and farside) is via a single submarine cable (...
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0answers
22 views

How to create a Retentive/Accumulative Timer from On-Delay/Off-Delay Timers

According to this post , all timers can be created from just the On-Delay Timer (TON). At the end of the post, after showing how to create an Off-Delay Timer, an On+Off-Delay Timer, and a Flasher ...
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0answers
83 views

Design temperature for an electrical control panel?

I am putting together an electrical control panel composed of small VFDs (like Siemens micromaster 440), PLC AB 1400 B etc, contactors, relays etc. What temperature and humidity should I design the ...
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1answer
41 views

Erratic behavior of thermocouple input

I am reading temperature from a K thermocouple on a PLC which is then forwarded to a trending software to see the data on a graph. The thermocouple is in a water trough/reservoir. In fact, there are 3 ...
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1answer
55 views

Best practice for adding Resistor to PLC cabinet

My Micro-step drive and PLC need a simple resistor network between their i/o ports.The optocouplers in the stepper drive have a max input current of 15mA, while the controller needs to output at least ...
1
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1answer
52 views

How to get ip address Schneider PLC controller TM218LDAE40DRPHN?

I am new to PLC technology and I am doing the following step, listed below: Connect from PLC to retrieve data through Ethernet using Modbus TCP/IP. I found that PLC didn't have its IP address ...
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1answer
67 views

Using Micrologix 1400 (1766-L32BXB) FET outputs to control frequency input to ST-M5045

There is a minimum current requirement in order to use the FET pins on the Micrologix controller of 21mA, and the output voltage of the pins are 24V. The ST-M5045 stepper driver data sheet says in ...
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1answer
43 views

Can a contactor be used as a temporal logic bit as in PLC?

I want to design a control logic circuit using relay logic. I want to have a bit as a marker as in PLC. Can I use a contactor for this function and then use auxiliary coils as a latch as in PLCs.
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1answer
38 views

How do you set up a VFD to run a motor at 2 different speeds?

I'm already familiar with the concept of altering the frequency to change the speed of the motor. So in this scenario, I'm looking into running a pump at 40Hz (high speed) and 23Hz (low speed). This ...
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0answers
35 views

PLC Relay Output Circuit

Can someone help with this question? I've answered it to the best of my knowledge based on the learning materials provided but the answers I've gotten are exactly the same as the example. Should 5v be ...
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1answer
83 views

How to calculate current through a resistor and LED?

Question C asks how's to calculate the current over the led and 3k resistor? Can someone please help me understand how to do it?
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1answer
48 views

Measuring sensor with two PLCs

Can I measure one sensor with two PLCs? I have a PLC that's part of a machine manufacturing stuff. Another PLC is part of a robotic arm that needs to grab the piece. It would be intresting to be ...
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2answers
78 views

Understanding ladder PLC logic

I'm trying to understand the flow logic of ladder language. Is it sequential like C/C++? "i don't think so" Particular case: I've been trying to something very simple but cant make it happen as I ...
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1answer
110 views

How can I connect two mutually exclusive output on one pin of a MCU?

I couldn't be sure how to make a proper headline, correct me if I am wrong with it. I have a reasonably working push button solution including hardware de-bouncing. There is no question on that. So,...
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1answer
53 views

Electrical isolation in PLC output cards

Every output card spec sheet I read says something about electrical isolation. One I read recently said "Isolated 1500VDC channel to channel". What does isolation mean and what advantages do isolated ...
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1answer
69 views

Amplifying milli Volts to Volts

I am currently using a KE-25 oxygen sensor which is galvano microcell type oxygen sensor which doesn't require a power supply to sense oxygen level in the environment. Depending on the concentration ...
0
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1answer
110 views

Control stepper motor with PLC?

I'm pretty much brand new to both stepper motors and PLC's and electrical in general, although I have an idea of the theory of how they work/what they do. I am trying to achieve is to be able to have ...
0
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1answer
131 views

Problem encountered while amplifying load cell signal with LM358

I have an S-type load cell to measure weight up to 100 Kg. Its datasheet mentions 3mV/V against full range and excitation voltage. When no weight is applied, the voltage is 9.9 mV (Excitation is 10 V)...
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2answers
56 views

Driving a hobby stepper motor with an industrial PLC

I am working with an industrial PLC, the Beckhoff BX9000, with 24 V digital outputs. I am looking to drive a hobby stepper motor with Polulu's 'A4988 Stepper Motor Driver Carrier', which accepts logic ...
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2answers
71 views

PLC as gateway with TCP/IP communication stack?

I'm having issues designing an architecture for communication in a vehicle. Currently a PC is connected through a switch to a series of ECUS, each one with a TCP2CAN converter. The PC has to be ...
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1answer
29 views

Detect if 3-phase 110VAC motor is running via 24VDC PLC input

We have an industrial machine with 3-phase ~250W AC (~2.5A @ 110V) motors on it. I want to non-invasively detect if the motors are running. That detection signal needs to feed into the 24V input of ...
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3answers
137 views

Can I connect Inductive Proximity sensor to two different PLC

Some background, I have a tractor that I want to make semi-autonomous. The tractor has it own PLC and an NPN Proximity sensor to measure speed. I have industrial PLC by Unitronics (V130) with I/O ...
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2answers
84 views

Commercial Availability of Bare Metal Automation Controllers [closed]

When I think of commercial automation controllers, I typically see 2 levels of system complexity. First, at a lower level, PLC's programmable with ladder logic, structured text or another 61131-3 ...
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5answers
2k views

Are there any commercially available PLC's that can compile/ download programs through an API?

My team has decided to use a PLC for controlling an industrial process that requires simple, real-time IO to external devices with minimal processing. However, we expect the exact outputs needed to ...
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0answers
23 views

Wide voltage range digital input with constant current sink

I'm building a device which should have a few digital inputs suitable for "industrial environments". The design of the input circuitry proved to be more involved as expected, since the following ...
2
votes
3answers
865 views

Should cable shields be connected to earth ground, or to power supply negative?

I'm working on a PLC cabinet, and I'm wondering whether I should hook cable shields to earth ground, or to the power supply negative. I checked and the power supply DC output is isolated. There's no ...
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2answers
131 views

Reading Servo Motor Status with PLC

I have a Panasonic A6 servo driver paired with Velocio Ace PLC. I am trying to read servo motor status. I followed the wiring diagram from the servo manual and connected the PLC digital input to Servo'...
1
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1answer
305 views

ST-Link V2 Programming STG-850 PLC — STM32

I'm trying to connect to a Barth STG-850 PLC for the first time and am using the ST-Link V2 programmer (not the ISOL version) and have been unsuccessful so far. The crux of my problem likely stems ...
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1answer
72 views

What do I need to do to connect an ADC IC to a Adam 6066??Is it even possible to read the inputs from the ADC chip?

I am working on a input array that uses a ADC (MCP3208 or something similar) to read in several analog inputs and convert them to Digital signals that go into an ADAM 6066 Module. What would I need to ...
2
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2answers
357 views

How to design a sharp 200kHz band pass filter

I have made an a fm communication system to send audio through power lines. The center frequency is 100khz or 200 khz and maximum frequency deviation is ±10khz(with no IF stage). The modulator and ...
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0answers
28 views

User manual for TSX DST 0835 PLC from Schneider

I've found myself in the need to look for the user manual (or at least the pinout and connector type) of the TSX DST 0835 PLC (8 Digital Outputs) from Schneider. I've looked up in Google and even ...
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1answer
431 views

Driving a Peltier w/ PWM or analog out [duplicate]

I feel like this has been beaten around the bush in a couple other topics, but I am hoping to find something a bit more definitive. I am looking to control a Peltier thermoelectric cooler. I've got a ...
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0answers
55 views

Using GX Simulation 2 with OPC Server over comms

I have an OPC server communicating between iFix (both running on the same Windows computer) and a Mitsubishi PLC, Q02CPU, over UPD fine. Is it possible to use another Windows machine connected by ...
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5answers
828 views

Fundamental difference between microcontroller and PLC [duplicate]

I am a teaching assistant for a sophomore mechanical engineering laboratory course. One of our lab modules is focused on PLCs, and another uses Arduino micro controllers. One of my students asked why ...
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1answer
101 views

Design a circuit with range of -10 to +10V

I'm using a PLC for a project, the output from the PLC DAC is 0-10V but I need to scale it to -10 to +10 V (similar to the graph). Obviously I need to build a circuit with an opamp, I'm thinking of ...
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1answer
53 views

convert from serial modbus to ethernet through plc?

can I use a plc as a converter to convert from serial modbus(RS485) to either ethernet or usb using code ? , the plc is modicon m340 without communication module but the cpu has serial port , ethernet ...
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1answer
176 views

Switching outputs using ladder logic

I am new to programming in ladder logic and am trying to write a simple program wherein outputs Y65 and Y66 follow the sequence: Y65 turns on for 30 seconds. Y65 turns off. Y66 turns on for 30 ...
3
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1answer
156 views

Servo controller

I am working with an LS IS brand servo driver and servo motor. I have some difficulties with getting it to work. Full manual I have to mention that I don't have knowledge in servo motors. I am ...
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2answers
90 views

ADC input software multiplexed between current/voltage input

Problem I need to design an isolated analog front end to a Raspberry Pi which needs to work with either a 4-20mA or 0-10V transmitter. I've been studying existing analog input modules from major PLC ...
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1answer
671 views

optocoupler H22A2 driving a plc input

https://www.vishay.com/docs/83741/83741.pdf example 2 I have existing H22A2 optocouplers that I am trying to run 12vdc through to get a plc input to turn on and off. I am using a 1k resistor on the ...
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1answer
126 views

WAGO PLC Datasheet I/O' module specs

In "WAGO" PLC datasheet of Analogue and digital I/O's modules what does the following measns : 1- Isolation: 500 V system/supply for analogue i/o module 2- Isolation: 500 V system/field for ...
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0answers
262 views

Stepper motor controlled by PLC not working

I'm pretty new to stepper motor electronics and really stuck with a simple setup! I'm trying to drive a linear actuator (stepper motor and ball screw) with PLC and carry out positioning moves. ...
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1answer
289 views

How can I use half-wave rectified 120VAC to activate a PLC input?

I am working with a CLICK PLC with the C0-08NA 120VAC input module. According to the documentation, the C0-08NA's equivalent input circuit looks like this: A device I need to interface with is ...
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2answers
127 views

2 doors - one room - access control

I've been tasked in designing logic for dorm rooms. The design of the dorm is that that two rooms share the one bathroom (roomL-door-bathroom-door-roomR). I'm having trouble designing logic for it. ...
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2answers
264 views

Can you use a LED driver (WS2801) for a 4-20mA control loop

I am trying to make a 4-20mA control loop on a home made sensor that will connect to a PLC. I was using Texas Instruments XTR111AIDGQR, but it is too expensive, costing $1.72. so want to try switching ...
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2answers
42 views

Can a ITS4100S-SJ-N High side power switch be used to switch AC/DC load

I have seen a PLC which uses the ITS4100S-SJ-N component to switch (just on/off) a 24V DC, 2A max. load. I was asking if those components can also be used to switch 24V AC? Datasheet: https://www....