T diamond in SAMA diagram ?
T diamond in SAMA diagram ?
(OP)
Hi all,
Need your explanation about the T (Transfer) in the diamond in SAMA diagram. What is the physical meaning ? Why is it always placed in between PID controller output and actuator ?
Thanks a lot
Mongoose
Need your explanation about the T (Transfer) in the diamond in SAMA diagram. What is the physical meaning ? Why is it always placed in between PID controller output and actuator ?
Thanks a lot
Mongoose





RE: T diamond in SAMA diagram ?
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: T diamond in SAMA diagram ?
A PID algorithm includes an automatic/manual selector in almost all applications. The rare exceptions might include compressor surge control, etc.
RE: T diamond in SAMA diagram ?
But it is still unclear to me since the description in the SAMA standard says that this is the symbol of a automatic/manual transfer switch. Could some one explain more in details? What is the difference and what happens when we put a T in rectangle (means automatically executed) instead of the T in the diamond, in an example SAMA diagram with 1 PID connected to an actuator (control valve).
Thank you
RE: T diamond in SAMA diagram ?
R.Thiyagarajan.
RE: T diamond in SAMA diagram ?
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Sometimes I only open my mouth to swap feet...
RE: T diamond in SAMA diagram ?
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: T diamond in SAMA diagram ?
http://www.measure.org/ReferenceDocs.htm