Chat series | configuration software and PLC how to communicate?

Original 2025-02-14 08:53:55

In the "symphony" of the factory floor, the PLC(programmable logic controller) is the "conductor" who controls the action of the equipment, and the configuration software is the "music" that records and conducts. But how do the two "talk" seamlessly? Today we will reveal the "communication password" behind industrial automation - efficient collaboration between configuration software and PLC.

PLC and configuration software: "translator" in industrial field

If the PLC is compared to the brain of the device, the configuration software is the "nerve center" that connects the brain and the operator. It is responsible for translating the "machine language" of the PLC into visual data, curves and alarm information, so that engineers can control the whole situation in front of the computer.

Communication: The "language system" of industry

To make the configuration software and PLC "understand each other", a unified set of "language rules" is needed. Common communication methods include:

"Call" mode: Serial communication (RS232/RS485)

Suitable for short distance "point-to-point" conversations, such as retrofitting old equipment.

Disadvantages: slow speed, weak anti-interference ability, gradually eliminated.

"Email" mode: Ethernet communication (TCP/IP)

High speed, stability, support for remote monitoring, modern factory "standard".

Application scenario: cross-workshop data acquisition, cloud data analysis.

Wechat Group Chat mode: Fieldbus (Profibus, Modbus, etc.)

Suitable for equipment-intensive production lines, one configuration software can "group chat" with multiple PLCS at the same time.

Typical representative: Modbus protocol, simple and universal, known as "the Mandarin of industrial communication".

Intercom mode: Wireless communication

Not afraid of complex cabling, suitable for mobile devices or dangerous areas.

Pain points: Stability is affected by the environment and must be deployed with caution.

Communication protocols: The Industry's "code Manual"

Different PLC brands have their own "dialects", and the configuration software must master the corresponding "code" in order to accurately dialogue:

Siemens PLC: S7 protocol, Profinet

Common protocols: Modbus(support cross-brand compatibility), OPC(break data silos)

Future Trends: The "smart Upgrade" of industrial communications

With the popularity of 5G and edge computing, the communication between configuration software and PLC is moving towards:

Lower latency: 5G makes remote control as responsive as local operation.

Higher security: Blockchain technology is tamper-proof and prevents "data hijacking."

More intelligent: AI algorithms are directly embedded in PLC, and configuration software enables predictive maintenance.