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Depicting PLC control on Process Flow Diagrams

Depicting PLC control on Process Flow Diagrams

(OP)
Is there a good way to show PLC control logic, both analog and discrete, on a PFD?  How would one show manually-inputted PLC parameters (e.g., a manually-inputted flow limit)?
 

RE: Depicting PLC control on Process Flow Diagrams

You cannot squeeze it all onto a PFD, create separate diagrams and put a cross reference to them on the PFD.
Or use ControlDraw and add the PLC logic as linked diagrams.

Francis
www.controldraw.co.uk
www.s88control.blogspot.com

RE: Depicting PLC control on Process Flow Diagrams

PLC/DCS Logic is not typically shown on a PFD. The PFD is used more for presenting flows, temperatures, volumes, pressures of the process at a higher level.

The P&IDs are what should contain the PLC/DCS logic. Take a look at ISA 5.1 for reference on how to show the PLC logic.

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This is normally the space where people post something insightful.

RE: Depicting PLC control on Process Flow Diagrams

You cannot squeeze it all onto a P&ID either, create separate diagrams and put a cross reference to them on the P&ID.
Or use ControlDraw and add the PLC logic as linked diagrams.

Francis
www.controldraw.co.uk
www.s88control.blogspot.com

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