Short definition
Programmable Logic Controllers (PLC) are robust industrial computers for real-time control and regulation of automated processes. They replace hard-wired relay controls with freely programmable software. PLCs process digital and analog signals with high reliability under harsh environmental conditions. In membrane filtration systems, PLCs are the central automation element for precise process control, safety functions and integration into higher-level control systems.
Functional principle
The PLC cycle includes reading the inputs, program processing and outputting the positioning commands in millisecond intervals. Programming is carried out in accordance with IEC 61131-3 in languages such as Ladder Logic, function block diagram, structured text or GRAFCET. Modular I/O systems enable flexible configuration. Communication interfaces such as PROFINET, EtherNet/IP or OPC UA connect PLCs with HMI, SCADA and MES. Integrated web servers enable remote diagnostics. Safety PLCs meet safety requirements up to SIL 3 with certified function modules.
Areas of application
PLCs are the workhorse of industrial automation and are used in almost every membrane filtration system. They offer optimum value for money, proven reliability and worldwide availability. From compact controllers for individual filter units to networked multi-PLC systems in large waterworks, they cover all automation requirements.
Typical areas of application:
- Stand-alone control units for modular filtration units
- Coordination of several process steps in batch systems
- Motion control for drives and positioning tasks
- Integration of safety functions and process control
- Edge computing for local data processing and diagnostics
Summary
PLCs are the industry standard for reliable process automation with proven technology and worldwide availability. They offer maximum flexibility through free programmability and high robustness. For plant manufacturers and operators, they mean long-term investment security, a broad supplier base and comprehensive engineering and service support in membrane filtration.
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