Differences in instrument numbers in PID
Thread Content
I need help asking: in a PID diagram, what are the differences between PICA, PIAS, and PICAS?
P: Pressure, I: Indication, C: Regulation, A: Alarm, S: Interlock
So what is the difference between C regulation and S linkage?
C regulation indicates that there is output adjustment; subsequently, it may control the control valve or send signals to the frequency converter, stroke control, etc. S interlocking indicates the presence of interlocking logic relationships.
S: Switch, which indicates the issuance of an interlock switch signal； C: Control, which refers to control mechanisms, meaning continuous control and adjustment ； A: Alarm refers to an alert, which means providing audible or visual warnings.
S is a digital signal, and C is an analog signal – is that correct?
\"Chain\" refers to the linkage between this device and other devices, while \"C\" stands for control, meaning that DCS or PLC can remotely control this device :victory:
C is for regulation; the output is generally an AO signal； S is interlocking, and the output is generally a DO signal.
P: Pressure, I: Indication, C: Regulation, A: Alarm, S: Interlock
Refer to Table 4.1.1 of HGT 20505-2014