33
P-SL
Lower Limit of Input Range:
P-SU
Upper Limit of Input Range:
The Lower Limit and the
Upper Limit of Input Range establish the desired low
and high limit for the type of input used. The Lower limit
must be greater than or equal to the input type’s lower
limit, while the Upper Limit must be less than or equal to
the input type’s upper limit. Setpoint settings are
restricted to values between P-SL and P-SU. Parameter
values that are calculated as a percentage of full scale
are affected by these settings. An underscale or an
overscale error is indicated if the process value goes
below or above the range by 5% of full scale. The pri-
mary purpose of these parameters when used with ther-
mocouple or RTD inputs is to limit setpoint settings.
When an analog input is used, the signal is scaled for
the engineering unit range selected. For example, when
a 4-20 mA input is used, the value of P-SL corresponds
to 4mA and the value of P-SU corresponds to 20 mA.
The engineering unit range could be %, PSI, pH, or any
range which can be scaled between -1999 and 9999
units.
Refer to the Table of Input Type Codes on page 32 to
determine the measuring range for a particular input
type.
