West Control Solutions MRC 7000 Recorder Manual - Manual (Page 54)

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Appendix B
Glossary
DISPLAY FILTER FACTOR
This parameter is adjustable from 1 to 20 which represents the number of scans per second
of the process variable that are averaged together before updating the displayed and re-
corded value. The factory default value is 1 = no filtering. Display code dFF.
HYSTERESIS
This parameter is adjustable from 0 to 300 units representing the width of the band (half
above and half below setpoint). Used with Alarm outputs to reduce cycling. For instance, with
a value of 4 and an alarm point of 70 the output will turn ON when the process variable drops
to 68 and stay ON until 72 is reached, then turn OFF the output. Does not apply to Limits.
Factory default = 3. Display code HyAo.
INPUT CORRECTION
This parameter is adjustable from -300 to 300 units and is used as a method to compensate
for a linear sensor error. Factory default is 0 = no correction. Display code iCor.
PEN ACTION ON POWER UP
This parameter specifies whether this pen, on a power-up, will drive to the "Home " position
(center of chart), then return to its correct position. This is done as a Cal Check. Settings are
0=go to "home" and 1=remain in last position prior to power down. Default=0.
PLATEN
The flat surface in the instrument upon which the chart rotates.
PROCESS FILTER FACTOR
This parameter is adjustable from 1 to 20 which represents the number of scans per second
of the process variable that are averaged together before updating the process value used for
alarm and PV output purposes. The factory default value is 1 = no filtering. Display code
PFF.
PROCESS OUTPUT
Allows re-transmission of the process variable. Factory default is 0 = not selected. Display
code Pout. If selected, must be assigned to a current output and scaled using Process Output
upper and lower values.
PROCESS OUTPUT UPPER AND LOWER VALUES
(Used in conjunction with process output)
These parameters specify the process value range over which the assigned current output will
decrease linearly from 100% to 0%. If the process value is greater than Pou the output will be
100%/ If the process value is less than PoL the output will be 0%. Factory default values are
2000 for the upper value and 0 for the lower value. Display codes Pou (upper) and PoL
(lower).
PROCESS ROUNDING
This parameter is adjustable from 0 to 100 units and is used to round the process value to the
nearest value specified. This is for display only and does not affect the recorded value or
control action. Intended for use where the engineering units span is large, to reduce display
fluctuation. Factory default is 0 = no rounding. Display code Prnd. (e.g. Prnd = 3, Process
Value = -6, -3, 0, 3, 6, 9....).