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PLC vs Micro PLC vs PAC:Core Technologies
2025-06-13 14:32:23

Analysis of the Core Technologies of the Three Major Industrial Controllers


1.PLC (Programmable Logic Controller)

industrial PLC controllers are the cornerstone of programmable logic controllers, designed specifically for harsh industrial environments. These systems manage logical operations through plc programming controller languages such as ladder diagrams, coordinating the sequential operation of multiple workstations in the packaging production line. When product defects or equipment failures are detected, they can immediately shut down and sound an alarm. Its advantages lie in:

·High reliability and real-time deterministic response, suitable for key tasks such as temperature control and filling accuracy

·Modular I/O expansion capability, supporting mixed configuration of analog and digital quantities

·Industrial grade design that can withstand dust, humidity, and electromagnetic interference

Typical application scenarios include continuous motion control of pillow packaging machines and sequential start stop of vacuum packaging systems.

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2. Micro PLC

As a compact solution, Micro PLC performs well in single machine devices with limited space. Despite its reduced size, it still possesses core PLC functions:

·Support basic logic control and communication protocols (such as Modbus RTU)

·Integrated high-speed counter (up to 100kHz) for processing encoder signals

·Low cost implementation of simple automation tasks, such as sealing and cutting control of small vertical bag making machines

But limited by processing power and I/O points (usually ≤ 64 points), it is difficult to handle multi axis synchronization or large data processing tasks.


3. PAC (Programmable Automation Controller)

PAC combines the real-time reliability of PLC with PC level processing capabilities, becoming a technology engine in high-end packaging machinery

·Equipped with multi-core processors, synchronously running motion control, visual detection, and data recording tasks

·Support the development of complex algorithms using high-level languages such as C++/Structured Text

·Directly integrate SQL database and OPC UA communication to achieve data exchange with MES/ERP system

For example, in the lithium battery PACK line, the CTH300 series PAC can coordinate robot handling, laser welding, and testing stations, while collecting 500+parameters for quality traceability

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