Questions tagged [plc]

Programmable Logic Controller

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34 views

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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20 views

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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1answer
40 views

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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2answers
89 views

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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2answers
59 views

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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2answers
33 views

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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29 views

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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20 views

Control PLC with SLMP over ethernet

I did a lot of research for being able to control my Mitsubishi FX-5U PLC. I want to control it over network using SLMP with 3E frame messaging, but I am unable to understand the message frame. I am ...
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13 views

how can i added macro step in tia protal

I'm using Tia portal V13 and i need to add a macro step in my graph-7 . how can i can integrate the macro step in my principal Graph-7 ?
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1answer
52 views

MODBUS RS-485 RTU

can I use this type cable for MODBUS RTU which master 140M far from slaves ?
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5answers
100 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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1answer
56 views

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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55 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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0answers
17 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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101 views

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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2answers
38 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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32 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
27 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
35 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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0answers
41 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
45 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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1answer
197 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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3answers
165 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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29 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
72 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
35 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
69 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
71 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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0answers
58 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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3answers
106 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
351 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
55 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
124 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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0answers
48 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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0answers
34 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
161 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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0answers
83 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
79 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
169 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
46 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
28 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
1k 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
45 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
94 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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4answers
1k 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
53 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
38 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
33 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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