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limit for the type of input used. The value must be less
than or equal to the input type’s highest limit. Setpoint
settings are restricted to values less than the high limit.
Parameters which are calculated as a percentage of full
scale are affected by this setting. An overscale error
message is indicated on the process variable display
when the process variable goes above the Upper Limit
of Input Range setting by 5% of full scale. The primary
purpose of the upper limit when used with a thermocou-
ple or RTD input is to limit setpoint settings. Making the
input range smaller does not increase the accuracy. The
primary purpose of the Upper Limit of Input range when
used with 1-5/0-5V DC or 4-20/0-20mA DC signal input is
to scale the range so that 5V DC on a 1-5/0-5VDC signal
and 20mA DC on a 4-20/0-20mA DC signal equals the
high limit of the engineering unit range used. The engi-
neering unit range could be %, PSI, PH, or any range
which can be scaled between -1999 and 9999 units.
Enter a value to set Upper Limit of Input range based on
the type of input used.
P-dP
Decimal Point Position (Resolution):
The Decimal Point
Position is the resolution at which the controller displays
the process variable and other parameter values. The
display can indicate integers, tenths or hundredths of a
unit. The Decimal Point Position does not increase the
accuracy of the controller, it only increases the resolution.
For a thermocouple, integers are usually sufficient due to
the accuracy rating and the programmed input range. For
a RTD (Pt100), integers or tenths of a degree may be
entered, because of the increased accuracy of these
sensors, depending on the programmed input range. For a
Summary of Contents for CN4321
Page 33: ...32 SYSTEM WIRING DIAGRAMS Example 1 Example 2...
Page 45: ...44 Deadband Overlap...
Page 48: ...47 Table of Input Type Codes...
Page 50: ...49...
Page 53: ...52 Table of Alarm Action Type Codes CN4321...
Page 54: ...53 Table of Alarm Action Type Codes CN4431...
Page 59: ...58 Table of Output Type Codes...