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automation:plc [2026/01/06 15:10] – created vamsanautomation:plc [2026/01/06 15:14] (current) – vamsan
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 === PLC === === PLC ===
-===== PLC ===== +{{ :automation:simatic_1515r_2_pn.png?120|}} 
-The first question that comes to mind is: what exactly is a PLC? Is it just a PC, a microcontroller, or a trendy but temporary device?+The first question that comes to mind is: What exactly is a PLC? Is it just a PC, a microcontroller, or a trendy but temporary device?
  
-It’s unlikely to categorize PLCs as modern and short-lived devices. The term PLC stands for programmable logic controller, and in German, it’s called SPS, short for speicherprogrammierbare Steuerung. +It’s unlikely to categorize PLCs as modern, short-lived devices. The term PLC stands for programmable logic controller, and in German, it’s called SPS, short for speicherprogrammierbare Steuerung. 
-   +In 1968, GM Hydramatic, the automatic transmission division of General Motors, sought a solution to replace fixed-wiring relay systems. Bedford Associates of Bedford, Massachusetts, submitted the winning bid. The result of this project was the first PLC, built in 1969 and designated 084, named after Bedford Associates' eighty-fourth project. Interestingly, the first industrial communication protocol, Modbus, was developed simultaneously with the first PLC. Despite being over half a century old, it remains one of the most widely used protocols today (see Modbus RTU/TCP). 
- +
-In 1968, GM Hydramatic, the automatic transmission division of General Motors, was seeking a solution to replace fixed wiring relay systems. The winning bid was submitted by Bedford Associates in Bedford, Massachusetts. The result of this project was the first PLC, built in 1969 and designated as 084, named after Bedford Associates' eighty-fourth project. Interestingly, the first industrial communication protocol, Modbus, was developed simultaneously with the first PLC. Despite being over half a century old, it remains one of the most widely used protocols today (see Modbus RTU/TCP). +
  
 Instead of fixed relays, the PLC can perform control dynamically through software, and it must load the following tasks to do so: Instead of fixed relays, the PLC can perform control dynamically through software, and it must load the following tasks to do so:
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   * Communication interface for receiving and transmitting data over communication networks   * Communication interface for receiving and transmitting data over communication networks
  
-===== Simatic =====+=== Simatic ===
 {{ :automation:simatic_s5_pg685_programmiergeraet.png?200|Simatic S5 PG685 Programmiergerät}} {{ :automation:simatic_s5_pg685_programmiergeraet.png?200|Simatic S5 PG685 Programmiergerät}}
 **SIMATIC** is a series of programmable logic controllers and automation systems created by Siemens. First launched in 1958, the series has evolved through four major generations, with the most recent being the SIMATIC S7 series. It is designed for industrial automation and manufacturing processes. **SIMATIC** is a series of programmable logic controllers and automation systems created by Siemens. First launched in 1958, the series has evolved through four major generations, with the most recent being the SIMATIC S7 series. It is designed for industrial automation and manufacturing processes.