The CSI Process Automation Function Library is a modular IEC 61131-3 control library implemented in CODESYS® and developed as part of a structured roadmap toward alignment with Open Process Automation and O-PAS™ principles.
It encapsulates proven regulatory and supervisory control behaviors in a portable, vendor-neutral form that supports multi-vendor deployment, long-term lifecycle independence, and incremental modernization across DCS, PLC, and open control environments.
The library focuses on application portability and control behavior consistency. It does not constitute a complete O-PAS system and does not imply conformance or certification.
The table below distinguishes currently implemented function blocks from planned roadmap additions.
PID
Control Selector (CS)
Output Splitter (SPLT)
Integrator (INTG)
Analog Input (AI)
Analog Output (AO)
Discrete Input (DIN)
Discrete Output (DOUT)
Bias / Gain
Dead Time
Lead–Lag
Ramp Generator
Signal Characterizer
Input Selector
Ratio
Manual Loader
NAMUR PID
Timer
Planned items reflect current roadmap intent and may evolve.
Cascade control improves disturbance rejection by separating fast inner-loop dynamics from slower outer-loop objectives, enabling more stable and responsive control across changing conditions
Selector-based constraint handling arbitrates between competing process objectives without modifying underlying controller logic, supporting safer operation during limits, trips, and abnormal conditions
Collaborative Systems Integration (CSI) is an independent systems integrator specializing in advanced process control and open, vendor-neutral automation architectures.
CSI works with asset owners and integrators to design, implement, and modernize control systems with a focus on application portability, lifecycle independence, and long-term architectural control. Our work spans advanced control, system integration, and incremental alignment with Open Process Automation principles across brownfield and hybrid environments.
