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Chemical Engineering has shared a new FAYF. This FAYF is related Choosing Control System.Process engineer - Why you need to know Control System
Choosing a control system is not a process engineer task. It is typically Instrumentation and Control engineer task. However, understand what is control system, how many type of control system, how a control system works, differences between control system, etc may be important to a process engineer as process engineer define main control objective in Piping & Instrumentation Diagram (P&ID) to achieve the control target and preparation of System Control Narrative so that Control engineer can further develop the control logic.
Typical Control System
Two main type : Distributed Control System (DCS) and Programmable Logic Control System (PLC). A DCS is designed for process control with refinery control origins whilst a PLC is designed for machine or motion control with car factory relay panel origins. While PLCs are sometimes used for process-control applications, there are some trade-offs in terms of degree of programming, robustness and operational suitability.
Control System Characteristic
Distributed control system (DCS)
1. Gregg, J., Control System Selection, Chem. Eng., August 2002, pp. 62–66.
2. Bohan, J., Industry Solutions Manager, Honeywell Process Solutions (Phoenix, Ariz.), personal communication, Apr. 6, 2009.
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Related Topic
Choosing a control system is not a process engineer task. It is typically Instrumentation and Control engineer task. However, understand what is control system, how many type of control system, how a control system works, differences between control system, etc may be important to a process engineer as process engineer define main control objective in Piping & Instrumentation Diagram (P&ID) to achieve the control target and preparation of System Control Narrative so that Control engineer can further develop the control logic.
Typical Control System
Two main type : Distributed Control System (DCS) and Programmable Logic Control System (PLC). A DCS is designed for process control with refinery control origins whilst a PLC is designed for machine or motion control with car factory relay panel origins. While PLCs are sometimes used for process-control applications, there are some trade-offs in terms of degree of programming, robustness and operational suitability.
Control System Characteristic
Distributed control system (DCS)
- Continuous control
- Parameters change frequently
- Sequence capability in batch process
- Operators intervention
- Integration with other applications
- Robust control
- Multiple controllers interaction
- High availability
- Historical data collection
- High speed processing
- Discrete application (digital inputs/outputs)
- Application predominantly in machine/motion control
- Application do not change frequently
- SCADA architectures with PLCs
- Capability of operators intervention & decision
- Ladder logic is effective way to handle logic
- Separated application with small amount of I/O
1. Gregg, J., Control System Selection, Chem. Eng., August 2002, pp. 62–66.
2. Bohan, J., Industry Solutions Manager, Honeywell Process Solutions (Phoenix, Ariz.), personal communication, Apr. 6, 2009.
Download
Note :
*This FAYF is only available FREE to Chemical Engineering Magazine registered user. Login required. Subscribe FREE CE, click here.
** Download immediately as article available FREE within short period only. Do not wait.
*** Found lost link or unable to download, may contact me...
Related Topic
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