DCS versus PLC Architecture
The main difference between DCS and PLC is the business model which we discussed with comparison of DCS Versus PLC Architecture. DCS versus PLC Architecture The DCS business model can
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Control Systems Theory
Difference between DCS, PLC, and RTU ?
One of the most common questions is regarding the difference between DCS and PLC as well as between PLC and SCADA – and if there is any difference at all
What is Interposing Relay in a PLC System ?
Interposing Relay is the auxiliary relay which is used to isolate the two different systems / devices. This could be because they have different 0V references, different voltages, AC vs. DC. Interposing
PLC Alarm and Trip Documentation
A vast amount of documentation is required for the design and construction of a process facility, which are front-end and detailed engineering drawings. The main engineering documents used on a
Basics of Process Control Systems
The Process Control system may provide steady state or change of state (start-up, shutdown, batch) control functions. The latter may be implemented by automatic sequences or procedurally under manual control.
What is Alarm Management System ?
The purpose of alarm management system is to alert the operator to relevant abnormal operating situations. They include situations that have a necessary or possible operator response to ensure: Personnel
Process Interlocks and Trips
Protective tripping systems provide a defence against excursions beyond the safe operating limits by detecting a excursions beyond set points related to the safe operating limits (i.e. the onset of
What is Safety Control System ?
A safety control system or device is deemed to be safety related if it provides functions which significantly reduce the risk of a hazard, and in combination with other risk
What is Instrumentation Control System ?
An instrumentation control system is an electrical, electronic, or programmable electronic system (E/E/PES) which may perform some or all of the following functions: Monitoring, recording and logging of plant status
Setpoints and Alarms in Control System
Protective instruments and alarms in industrial plants are provided with adjustable setpoints where specific actions are either automatically initiated, prohibited, or alarmed. Setpoints and Alarms For example, pressure sensors typically