Questions tagged [plc]

Programmable Logic Controller

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52 views

Industrial Oven Control

I'm working on upgrading an ancient oven that we bought second hand, which came with almost zero documentation. I have identified two fans one is exhaust fan and the other is a circulation fan. Is it ...
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15 views

Sercos Bus Monitoring

I want to monitor traffic on a SERCOS bus that is controlled by a Schneider/ELAU C600 PACDRIVE I have a profibus port on the C600 but don't want to impact scan time. Is there a device/Gateway that I ...
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SPI data lines look identical, but results are different, how is that possible?

I have a golden sample system which consists of 2 devices communicating via SPI. I swap one of the devices and bit bang the SPI to make it similar to the golden sample. However the bit banged device ...
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1answer
27 views

Hmi normally open or normally closed

Currently i am working on a new project for which im using Unitronics vision oplc ide .This is my first time using unitronics plc . I have a doubt , while i'm using invertbit,would the object be a NC ...
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31 views

Product ID tracking in a sorter machine

I'm writing a PLC program (Q Series Mitsubishi PLC, GXWORKS 2 Software) for a package sorting machine. The logic of the machine is the following: Packages are induced in the conveyor. A barcode ...
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1answer
22 views

Industrial IO board ST X-NUCLEO-PLC01A1 - design features

For a project I want to buy an X-NUCLEO-PLC01A1. So I studied the schematic and datasheets (CLT01-38SQ7)(VNI8200XP), but there are still some points that confuse me. What is the purpose of D20 - is ...
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49 views

24 Volt system with 2 outputs. Convert to 12 Volt Outputs

What would I need to add to set up to get 2 outputs at 12 volts. Outputs are 0 and 1. I would assume relays. Signal Outputs. For a 3 Position 12V Solinoid. Micro 820 2080-LC20-20QWB
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1answer
32 views

Short Circuit in Allen Bradley Micro850 Output Headers

Unfortunately, I have discovered that the outputs 0 and 1, as indicated by my blue Sharpie marks, have continuity. I have inspected the circuit for hours, and cannot seem to find the source of the ...
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26 views

How to pass a DBWx-value 2 block-calls deep on Siemens S7-400/Simatic

I'm working on code that was transported from a Siemens S5 PLC to S7. The code works with an old FC(FC2 in the example) that uses a WORD-input called "BNR" to load/save data. When block FC2 ...
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1answer
39 views

pt100 RTD transmitters not working - two in a row - am I doing something wrong?

I just tried to use two different ones of these RTD transmitters with a pt100 probe (3 wire) with no success. I am connecting the transmitter directly to a 4-20mA input on a PLC, as shown in the ...
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72 views

how to tell if this proximity sensor is NPN or PNP?

I have a proximity sensor without nameplate . I have done some tests that made me think it is a PNP Normally open . is my assumption correct ? is there another method to know ? TEST setup : Supply ...
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72 views

Zero crossing detector output to another optocoupler

I will use the configuration below to build a zero crossing detector to connect to a PLC. I will change the output voltage to 24VDC and the correspondig resistor to 50K. The problem is that the input ...
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27 views

Cold Reset STC125A60S2 PLC Board

I am working on these PLC Board: http://more-suns.com/product/html/?321.html but I cannot contact manufacturer. The fact is to have it programmed I have realized that I can only do it after a cold ...
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2answers
68 views

Thermocouple troubleshooting

I have a system error pop-up on an HMI of one of my machines. Since it only had a number, I tried to reach the manufacturer for the error code description. They said that this error usually is the ...
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1answer
33 views

Delay in turning on two different start buttons in Star/Delta starter on PLC

Currently I'm working on a university project based on Star/Delta Starter on PLC. I wrote program using LD, that switches on the circuit with a motor rotating forward (of course with star/delta ...
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3answers
56 views

IO link sensors with PLC

This is probably a stupid question but I am new to IO link sensors. When using IO link technology with a PLC (siemens s7-1200) can you connect devices that are not IO link sensors? For example say I ...
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1answer
56 views

What is the best way to store data from Modbus TCP? [closed]

What is the best way to store all data generated from Modbus TCP in SCADA? it is better to store it in a file or directly to SQL Server? is data stored every second? If it store in SQL Server every ...
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45 views

Level sensor Transmitter

I have a level sensor and transmitter(4-20mA standard) of Qidian Automation for sensing level of liquid in tank having capacity of 1000 litres. On transmitter it is displayed 0.516 when tank is half ...
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2answers
56 views

Driving a 12V-24V 20 ohm solenoid from a 24V 0.5A input signal

I had a question about trying to get a solenoid with 20 ohms resistance to power up from a 24V Power supply limited to 0.5 amps. I tried connecting a 10 ohm resistor in series, to drop the driving ...
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3answers
167 views

Wiring a simple 24v DC light on an output terminal on a PLC

I am using a Micrologix 1100, part number 1763-L16BWA. I have been able to get the input side working, but can’t seem to figure out the wiring for the output side. I also have an 1762-IQ8OW6 extension....
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1answer
36 views

I need to understand the circuit diagram of a Klöckner Moeller relay output unit

I am working on the automation of an old servo driven feed system for a mechanical power press. I have come across these relay output units from Klöckner Moeller (machine make year 1980`s) pictures ...
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1answer
84 views

Using RS485 over CAT5e Foiled Twisted Pair (FTP)

I'm planning a system that has two sub systems that need to communicate with the PLC via RS485. The baud rates are 9600 and 19200 bps. The cables are static (i.e. not moving) and placed inside of a ...
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36 views

EC and pH sensor in plc automation

I am working with automation using pH and EC sensors. Both are of 4-20mA communication standard. When at a time single sensor is placed in liquid(in 1000 litre tank) then everything works fine (...
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31 views

How to write a variable from firmware to a PLC address in OpenPLC

I'm using openPLC for my project and this requires sending data from the firmware to OpenPLC. More specifically, I need to send collected data from the embedded program in the firmware to PLC ...
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2answers
104 views

Max load on analog output

I am planning to connect an Omron ZL1-series 4-20 mA level transmitter to a 0-10V input on a PLC. To do so, I have to convert the current to a measurable voltage by connecting a 500 Ω resistor to the ...
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72 views

Turn Node MCU into a PLC which is integrated Lora module for IoT application

I've built a PLC that supports Lorawan and Modbus protocol using Node MCU. I managed to make it possible with Modbus by using OpenPLC. Everything worked well apart from its limitation in the distance ...
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2answers
27 views

Testing the accuracy of a PLC current input module - economical approach?

I don’t want to suggest a particular brand or model so to discourage a good universal approach. But let’s say the DUT here would be your typical industrial PLC module, a typical 4-20mA SAR ADC based, ...
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1answer
75 views

What is the difference between these two ladder logic diagrams?

First ladder logic diagram: Second ladder logic diagram: I am trying to implement a toggle switch. On the rising edge of "Change", it should toggle "ToggleThis". I thought the ...
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1answer
92 views

Rise time of 6N136 opto-coupler

I am trying to use below circuit for convert 24VDC high speed pulse to 5VDC pulse that can interface to a stepper driver IC. I have used 6N136 opto-coupler and according to its datasheet it can handle ...
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1answer
41 views

Low power temperature monitoring

I'm trying to monitor the temperatures at various location inside and arround my house. So far, I used battery powered (18650 Li-Ion) ESP8266 chips with a DHT22 sensor. The ESP wakes up every 5 ...
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1answer
24 views

Removing STM32F4xxx based HMI from CANBUS puts the network in BUSHEAVY state

I have a CANBUS with 3 devices on it. A PLC (CAN IO 14+, HAWE), a HMI (Barth DMA-20) and a 6 button CAN enabled button panel (Greyhill). The issue is, when I remove the display from the network (...
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2answers
456 views

TIA portal - failed to establish a connection

I'm using TIA portal siemens v15.1 for my project when i tried to upload the code to the plc this error pops up. Appreciate anyone can help me in this issue
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1answer
39 views

Simatic Microbox PC

I just started my research studies and part of it is based on an assembly line which uses a Microbox IPC427E for automation. However, I have never used a microbox before and only have some experience ...
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1answer
87 views

Regarding PLC and several input/ output modules

I have to use more than 40 servo motors and 20+ load cells using PLC. But the problem is that I have to use many I/o modules ( that is costly and hectic). Can I reduce the no of I/o modules by any ...
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3answers
756 views

Communication between PLC and Arduino using IO-Link

I have a small device based on an Arduino and I want to send some data to a PLC that has no RS232 port but can have an optional IO-Link master card. I looked around but found no info about Arduino and ...
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1answer
44 views

Drive stepper motor with potentiometer in Siemens PLC

It is difficult for me to drive a stepper motor with potentiometer (position stepper motor with position potentiometer). I've done program, to see the value from potentiometer with NORM_X. I am using ...
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1answer
32 views

STEP7 MICROWIN PLC Ladder Diagram

I draw like the first figure in the program, but when I save the program it automatically becomes the second shape. Do the two mean the same thing?
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1answer
32 views

How can I cycle through 4 LEDs with Timer Off Function (TOF)?

I have 4 LEDs that need to be turned on and off sequentially and cyclically. This is my code from code warrior: ...
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1answer
89 views

Exactly what is an RTU (Remote Terminal Unit)?

I find the Wikipedia article and other sources ambiguous and I find that the definitions are so broad that I don't know how and when to use the term "RTU". I would like to figure this out because I ...
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1answer
73 views

TLP LogixPro PLC Simulator

This is my second day of learning PLC online. I am doing a simple ladder diagram, and I came up with the following diagram: The process I have in mind is as follows: As the switch is closed, the ...
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2answers
50 views

How to convert high impedance / ground output to 24V / ground output

My background is from software development so please forgive my ignorance. I have an Adam 6156EI device I can control via Ethernet, it has 16 digital outputs. When I programmatically set an output ...
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1answer
72 views

Control Board with simple logic

We are using an old electrical system in industry. My task is to digitalise it. As i saw, PLC is too expensive and large scale for our operation. Also, microcontroller needs programming which makes ...
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1answer
54 views

what is the logic behind these ladder lines

I have a ladder diagram for timing porpose.(keyence KV-24DR) some instructions are repeated many times but I dont understand what are these for. can anybody help me? the confusing thing is that the ...
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2answers
162 views

A very basic question about PLC field input switches

Below shows two simple ladder logic examples written for a PLC: As far as I understand, the -| |- and -|/|- above are the symbols we write for the PLC not the actual input switches. But we also need ...
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1answer
132 views

Creating ladder PLC logic using force inputs and outputs

I am currently using Allen Bradley PLC and RSLogix Micro to program it. The problem is: Create a ladder logic diagram for the following problem in which pump #1 and pump #2, alternately or ...
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1answer
40 views

E3JK-R2R3 wiring

Hi, this is E3JK-R2R3, brown and blue connect to power supply. I wanted to know is it either black or brown connect to +load and the white connect to 0V? If is it so, I don't see the electric flow.
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110 views

What do the letters and numbers mean in the addresses of Allen-Bradley PLCs?

I am using Allen-Bradley Programmable Logic Controllers. And using the Logixpro as a simulator. In PLC we are talking about counters, timer, math operations( addition, subtraction, greater than, less ...
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2answers
66 views

Storage bit in OSF and best way to detect falling edge

I was looking for a way to detect falling edges and I encounter two ways: |--XIO---ONS------------OTE--| and |--XIC------------------OSF--| |--OSF.OB---------------OTE--| My colleagues told me ...
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56 views

Connect DC/DC Conv Isolated Ground

I'm developing a modular equipment device aimed for industry, very similar to a PLC in terms of electronics. For all field interfaces I am using isolators and ESD protection for robustness and to pass ...
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1answer
50 views

Choosing controller/processor when real time feedback control system is required

Currently, I am planning to work on a system, in which we will be gathering the data from the multiple sensor for more than 15 parameters, based on the sensor value we will be controlling the ...

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