Top "Plc" questions

PLC (Programmable logic controller) or programmable controller is a digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or light fixtures.

How to work with real time in custom function block on ST in Codesys 3.5

I am trying to accomplish very simple task, but it looks like I cannot figure our how. My task is …

plc st codesys
Alternative to OPC-UA

Is there any decent alternative to OPC-UA as a solution for accessing process data of a system composed of various …

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PLC Ladder Logic Outputs

On a single ladder rung how many outputs can you have. If you have more than one. Would it be …

logic plc
Communicate with CoDeSys program on a Linux-based WAGO PFC200 PLC

I'm currently getting familiar with PLC's, the WAGO 750-8206 PLC in particular. It offers a linux OS and can run …

c++ linux plc codesys
Pymodbus Read/Write Floats (REAL)

I have modbus mapping setup in my AB Micro820 PLC. I have an array in 40001 for writing, and one in 42001 …

python ethernet modbus plc
Purpose of "MOVE" block?

What is the difference between using a MOVE block instead of a direct connection when an output is just to …

plc
What does the "@" sign mean (Omron PLC)?

What does the "@" sign means in ladder programming? Documentation explains the @ specifies an indirect DM address in binary mode ... offset …

plc
Trouble installing Siemens TIA software

I've have installed the Siemens TIA software from Siemens' Homepage The version is: SIMATIC STEP 7 and WinCC V15.1 / S7-PLCSIM …

plc siemens tia-portal
can't find snap7 library - linux

I'm running Rapbian on a Raspberry Pi Revision B. I downloaded the module python-snap7 as instructed on this webpage: Snap7 …

linux python-2.7 raspbian plc snap7
libnodave error while reading from Siemens s7-1200 (0x8104)

While checking s7nodave's EPICS device support for S7-1200 I've encountered a problem that refers to libnodave. When I'm …

plc libnodave s7-1200 siemens