Short definition
Control technology deals with the targeted influencing of technical processes by linking input signals to output signals according to defined algorithms. In contrast to Control engineering it works in open action chains without feedback of the process result. It includes time-, event- and process-dependent sequences such as sequence controls, interlocks and safety functions. In membrane filtration systems, it controls discrete processes such as valve switching, pump starts and the sequence of operating and cleaning phases.
Functional principle
The control technology is based on binary or digital logic links that are implemented in PLC programs in accordance with IEC 61131-3. Input signals from limit switches, level sensors or timers trigger defined actions. Sequence controls work step-by-step according to time or event criteria and are often programmed as GRAFCET or Sequential Function Chart (SFC). Interlocks prevent impermissible operating states through logical AND/OR links. Safety controllers in accordance with EN ISO 13849 or IEC 62061 ensure safe process shutdown in hazardous situations.
Areas of application
The control technology is fundamental for all sequential process sequences in membrane filtration systems. It coordinates complex cleaning cycles with defined phase sequences, controls multi-port valve configurations for different operating modes and synchronizes auxiliary processes such as dosing or sampling. Emergency stop functions and safety interlocks reliably protect personnel, system and product.
Typical areas of application:
- CIP sequence control with automatic phase change
- Batch processing in discontinuous filtration processes
- Valve matrix control for multi-stage systems
- Interlocking logic to prevent operating errors
- Emergency shutdown systems (ESD) in accordance with SIL requirements
Summary
The control technology ensures reliable and reproducible process sequences through clearly defined switching logic. It forms the basis for safe system operation and fulfills normative requirements for Functional safety. For operators, it means process reliability, reduced error rates and the basis for automated, validatable production processes in membrane filtration.
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