User guide

Watlow EZ-ZONE
®
RMH Module • 116 • Chapter 6 Features
Process Value Function
The Process Value (PV) function block accepts multiple in-
puts and performs a programmed math function to derive
an output value with Filter and Offset values applied. It
is assumed that no input error conditions apply. Some PV
operations must be performed in the user's units. Func-
tions may combine multiple inputs. Those inputs may have
incompatible units from a logical point of view. As a result,
unless otherwise indicated, the presentation of the output
value is the same as Source A. This accommodates tem-
peratures being multiplied, divided and offset by constants
and process inputs. Only inputs that have a source associ-
ated to them are used in the calculations.
An error, when read, can indicate any of the following:
None, Open, Shorted, Measurement Error, Bad Cal Data,
Ambient Error, RTD Error, Fail, Math Error, Not Sourced,
Stale
Source AValue
Source BValue
Source CValue
Source DValue
Source EValue
Process Value
Overview
Instances - 16 per RMH
Source Function A
Source Instance A
Source Error A
Source Function B
Source Instance B
Source Zone B
Source Error B
Source Function C
Source Instance C
Source Zone C
Source Error C
Source Function D
Source Instance D
Source Zone D
Source Error D
Source Function E
Source Instance E
Source Zone E
Source Error E
Pressure Units
Altitude Units
Barometric Pressure
Cross Over Point
Cross Over Band
Function
Filter
Offset
Output Value
Ranges specified in units or F
if expressed in C, range is smaller.
∞
∞
Error
[SFn;A] Source Function A : Analog Input, Process Value
[SFn;C] Source Function C : None, Analog Input, Linearization, Math, Process Value,
Variable
[SFn;E] Source Function E : None, Alarm, Compare, Counter, Digital I/O, Profile
Event Out A to H, Function Key, Logic, Timer, Variable
[SFn;b] Source Function B :
Variable
None, Analog Input, Linearization, Math, Process Value,
[SFn;d] Source Function D : None, Analog Input, Linearization, Math, Process Value,
Variable
[S2;A] Source A : 0 to 16Zone
[S2;C] Source C : 0 to 16Zone
[S2;E] Source E : 0 to 16Zone
[S2;b] Source B : 0 to 16Zone
[S2;d] Source D : 0 to 16Zone
[Si;A] Source A : 1 to 250Instance
[Si;C] Source C : 1 to 250Instance
[Si;b] Source B : 1 to 250Instance
[S;id] Source D : 1 to 250Instance
[Fn] Function : Off, Sensor Backup, Average, Crossover, Wet Bulb/Dry Bulb, Switch
Over, Differential, Ratio, Add, Multiply, Absolute Difference, Minimum, Maximum,
Square Root, Vaisala RH Compensation, Pressure to Altitude
[C;P] Cross Over Point : -1,999.000 to 9,999.000
[C;b] Cross Over Band : -1,999.000 to 9,999.000
[oFSt] Offset : -1,999.000 to 9,999.000
[P;unt] Pressure Units : PSI, Torr, mBar, Atmosphere, Pascal
[A;unt] Altitude Units : Feet, Kilofeet
[b;Pr] Barometric Pressure : 10.0 to 16.0
[FiL] Filter : 0.0 to 60.0 seconds
[``Pu]
[oPEr]
Process Value Menu
Operation Page
[Si;E] Source E : 1 to 250Instance
[``Pu]
[`SEt]
Process Value Menu
Setup Page
[Su;A] Source A : -1,999.000 to 9,999.000Value
[Su;b] Source Value B : -1,999.000 to 9,999.000
[Su;C] Source Value C : -1,999.000 to 9,999.000
[Su;d] Source Value D : -1,999.000 to 9,999.000
[Su;E] Source Value E : Off, On
[o;u] Output Value : -1,999.000 to 9,999.000