Soft Tag - What is it?
Soft Tag - What is it?
(OP)
I have one P&ID that shows two pumps. I have one PIT installed in the admission and another PIT in the discharge of the both pumps. Each PIT send their signal to one virtual FI (there is one note saying that this FI is one SOFT TAG) and this FI is sum with the other FI of the other pump and the result is used in one FIC to control one FV valve. I'm lost here. What is soft tag? And what kind of control is this? I know that I can read flow using one PDIT. I'm thinking that this guy is using the two PIT to calculate de flow (calculating the differential pressure using the two PIT) in the pump and using this value to control the valve. Is this?





RE: Soft Tag - What is it?
Soft tags are those tags within the DCS software that reflect the inputs, status values, calculated values etc.
RE: Soft Tag - What is it?
It is the opposite of a "hard" device. Although not usually described as "hard', "hard" means an instrument you can physically touch.
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RE: Soft Tag - What is it?
RE: Soft Tag - What is it?
Soft (DCS/PLC) tags are usually an instrument bubble inside a square. This saves one from having to make notes and write "soft tag".
Do you have or can you get a copy of ISA 5.1?
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This is normally the space where people post something insightful.
RE: Soft Tag - What is it?