Questions tagged [plc]

Programmable Logic Controller

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Transmitter / receiver connection order in current loop (4-20mA)

Is the order of transmitter and receiver connection in the current loop important? I have +24VDC power supply unit, PLC with current analog input and the sensor (for test case it's just 2.35kOhm ...
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How to convert this ladder logic to Sequential Function Chart

I am doing an assignment where I need to create an office management system that takes care of security, lighting, and heating on its own. It is required for us to make it in the sequential function ...
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Is there any ethernet and 4G gateway for PLC? [closed]

I'm new in PLC programming and used only Siemens Logo. The problem I'm facing is that I can not find any gateway device that can directly send the data to server. I want to avoid using PC for simply ...
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Connect analog sensor to PLC Omron CP1E-E30SDRA

I have a Wisner pressure sensor 0-10 bar with output 4-20 mA. I want to connect it with PLC Omron CP1E-E30SDRA which this PLC doesn’t have any analog input pin. I want to use this sensor to maintain ...
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Best approach to program a PLC using dbc file? (CAN communication)

I'm pretty new using CAN Communication but I need to program a Phoenix Contact PLC in Structured Text. The PLC should communicate with a motor that uses CANOpen protocol. The only resource I have is ...
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No current changes using INA219 to reading industrial sensor

I intended to use the INA219 chip to read the 4-20 mA current loop of the industrial sensor for the automation project. the sensor voltage is 12 V, my first schematic was as follows: The ground of ...
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An alternative to CADe SIMU

CADe SIMU is a industrial circuit drawning and simulation software. I have troubles with the icons size and some bugs, so I am looking for an alternative to CADe SIMU. I found good softwares to draw ...
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How to connect one digital/analog sensor to two separate devices?

I have an ifm electrical pressure sensor witha 3 wire sensor cable which is currently connected to an ifm IO-link master for receiving signals. I want to make a parallel circuit to connect the sensor ...
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how do i increase torque of leadshine ES-DH2306 servo motor (hybrid motor)?

i am using leadshine ES-DH2306 servo motor it is also called as hybrid motor. the torque of this motor is 20Nm. but when we are giving the load around 7 Nm it is failing.it is giving lots of jerke. ...
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PLC Motor Control

Im trying to control the speed of 2 brushed motors with a click plc, I'm using 2 seperate power supplies, 1 for the plc, and 1 for the Motors. Is there any way to alter the voltage supplied to the ...
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Design safety relay with OpAmp

I intend to use a safety relay for my project, however I found industrial safety relay mostly work with 24 VCC and is very big, so I decided to make a safety relay based on my specifications. What I ...
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Current amplifier for a PLC Analogue Output

I am looking to amplify the 0-20mA (or -10V~+10V) analogue output from a Siemens PLC module (Siemens S7-1200 SM1232) into 0-165mA @ 24VDC proportional solenoid that continuously controls gas flow in a ...
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Can you create subsystems in a Function Block Diagram (FBD) in PLC programming?

My Function Block Diagrams are becoming unwieldy. I am trying to subsystem them by using memory elements for input/output ports to break the diagrams into sub-diagrams. Is there a more standard way to ...
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4 answers
164 views

Microcontroller 24V digital output

For a microcontroller generating a 20mA industrial digital output. What kind of setup is best? I'm considering: Microcontroller pin driving a low current N-FET to pull a 24V signal to ground. But ...
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STM32F4 PLC Integer Calculation vs Float Calculation

I am using a PLC that use a STM32F4 as its processor. The PLC software has Integer and Float calculation commands. When I working with floating point numbers usually trying to use integer calculations ...
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what kind of controller could i use? [closed]

I'm newbie about electronics hardware. My question is; I listed electronic materials at my project. I have 41 digital output and 20 analog input. What kind of controller could i use for my project? ...
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Basics TCP communication with Siemens S7-1200 CPU

this is a vary basic question, but I am struggling to understand what I need to do to set up a TCP communication with a S7-1200 CPU. I want to use the TSEND_C and TRCV_C. I know the PLC's and the ...
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Profinet Configuration

I'm trying to communicate a PC with SIEMENS s7 1200 cpu 1214 dc/dc/dc via PROFINET. I have not found any source yet. This answer seems useful but I do not know how to create a GSD file. It is written ...
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Profinet connection between PC and PLC S7 1200

I am trying to create a communication between PC and S7 1200 PLC via Profinet. I have researched many web sites and I could not find any information for me. According to the research, I should use GSD ...
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2 answers
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How to setup two different inputs to one output

Good morning. I am hoping to get some insight on a setup I am working on. Current setup: 24V system. An area sensor when flagged by hand does two things. First, it sends a signal to the network that ...
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I keep getting this error but don't know why "Invalid input. - input required but omitted"

Please help me by checking if my program is correct or giving the correct ladder program. I keep getting "Invalid input. - input required but omitted" this error for all the variables in ...
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Can I connect Inductive Proximity sensor to two different input PLCs

Please, I´d like to know if I can connect a inductive proximity (PNP output) sensor in 2 PLCs inputs like the example in the image attached?
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Choosing right equipment for the Test Fixture

I'm planning to build a "Test Fixture" which tests PCB via PC that reads data from the I/O module. And since i want this project to be flexible to the PCB change, my preference gone towards ...
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MODBUS RS-485 RTU

can I use this type cable for MODBUS RTU which master 140M far from slaves ?
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5 answers
267 views

Multiple 4-20ma sensors cabling

I am planning on wiring 8 x 4-20ma 2 wire sensors to a PLC. I would like to know if I need an individual 2 core shielded cable for every sensor or, if I can simply run all the sensors in a single ...
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Is it possible to change counter signal to analog signal in Siemens Logo?

Is it possible to change counter signal to analog signal in Siemens Logo? When Cnt is for example 4, then the Analog Threshold Block is going to giving out a high signal, else low signal.
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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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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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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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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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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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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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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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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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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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3 answers
359 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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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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2 answers
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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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1 answer
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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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3 answers
144 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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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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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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3 answers
179 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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2 votes
3 answers
626 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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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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1 vote
1 answer
214 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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1 vote
0 answers
68 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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1 vote
2 answers
321 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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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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1 vote
2 answers
36 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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