Rockwell-automation T8019 Trusted Process Control Algorithms Manuale Utente Scaricare il pdf (Pagina 2)

SDS-8019

Trusted

Industrial Control System

Trusted

Process Control Algorithms-T8019

ICS Triplex

Technical data sheets are intended for

information and guidance. The Company

has a policy of continual product

development and improvement.

Specifications are subject to change

without notice. For latest information, visit

our Website:- www.icstriplex.com

MASS FLOW COMPUTATION

MASS

FLOW

The mass-flow computation block provides the mass

flow corrected for the current operating conditions.

(

)

(

)

()













××××××=

273T

14.7P

hemZCOUT

=P is the differential pressure, P is pressure and T is

temperature. C, Z, m, e and h are intended to be

constant values. All parameters are of type REAL.

=P and P are in psi, T is in

If T=-273, a divide by zero error condition is generated,

this is to increment the associated error counter and

the mass flow function is to return a value of -1. Over

and underflow conditions are to result in an output

value of -1 and increment the associated error counter.

DEVIATION ALARM

DEV_AL

DEV

The deviation alarm function block takes the current

process variable (PV) and set-point (SP), together with

the up-scale and down-scale deviation between the PV

and SP (DEV

and DEV

respectively). PV, SP,

DEV

and DEV

are of type REAL, both outputs

(DEV

and DEV

) are of type Boolean.

DEV

= ( (PV – SP)  DEV

)

DEV

= ( (SP – PV)  DEV

)

If an overflow condition occurs during the execution of

the function, DEV

is to be set to PV>0, DEV

PV<0 and the “overflow” error counter is to be

incremented.

PV, SP, DEV

and DEV

must be finite, i.e. not

±infinities or NaNs.

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