Hi everybody. I'm a "potential beginner" in process control. I've been reading some stuff about control and I couldn't manage to figure out what the Control Sequence Program carries out. Is it the program, i.e., the sequence of actions a controller executes in a DCS? Or, perhaps, is the CSP above a controller in any way? "Who" is executing the CSP in a DSP? Is it a term related to each controller?

Thanks in advance.

 

If you've been reading about the Control Sequence Program (CSP) in GE-design heavy duty gas turbine-related threads discussing Mark V turbine control systems, CSP refers to the software program which is downloaded to the turbine control processors (which have Intel 80186 microprocessors) that monitors, controls, and protects the turbine (combustion- or steam turbine) and its auxiliaries. It is a relay ladder diagram-type software program, "written" or edited using a proprietary program called the Control Sequence Editor. Once the program has been created or modified, it must be compiled, and then downloaded to the processors in the Mark V turbine control panel. The processors are then re-booted and the CSP is loaded into the RAM of the processor and then executed, usually at a rate of approximately 8 Hz (0.125 seconds).

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These jargons are vendor-specific. In Speedtronic Mark V control system, Control Sequence Program (CSP) refers to the complete logic that is executed in the controllers <Q> (<R>, <S> and <T>) and <C>. CSP, in this context, controls the startup, control shutdown and protection of a gas turbine and the load (generator, pump or compressor)

The logic is created off-line on a PC and downloaded to the controllers.

The term CSP referred to by a general-purpose PLC or DCS could have a similar context.