Rockwell-automation T8019 Trusted Process Control Algorithm Software P User Manual download pdf (Page 19)

Trusted

Process Control Algorithms T8019

Issue 8 Sep 07 PD-T8019 19

2.8. 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

to 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.

2.9. Manual Tracking

MANTRK

OUT

AUTO

The manual tracking function requires the current PID function output (X

OUT

), the manual set-point

(XO) and auto/manual mode control (AUTO). Xout, XO and XO

OUT

are of type REAL, AUTO is

BOOLEAN.

Whilst AUTO is TRUE XO

OUT

will be set to the current value of X

OUT

. On a transition to manual mode,

i.e. AUTO changes to FALSE, the XO

OUT

value will remain at its previous value until the value of the

manual set-point input (XO) changes. Following a change to the manual set-point, the value of XO

OUT

will reflect the value of XO whilst AUTO is FALSE.

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Rockwell-automation T8019 Trusted Process Control Algorithm Software P User Manual Page 19

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