Process Value Monitoring - Fisher DPR900 User Manual

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Introduction
The controller may communicate with a central computer system via
the RS-485 serial data communication channel. The communications
mode is half-duplex, using the COMLI communications protocol.
Two discrete inputs may be used to directly control either the output
signal or setpoint value. Other discrete inputs can switch the controller
to a remote or extra internal setpoint or a predetermined value. These
external discrete signals may also switch the controller between
different modes: Auto/Manual or Local/Remote.
The terminal block, which connects all input power and signal lines, is
at the back of a separate, permanently installed mounting cassette.
The controller slides into this cassette, eliminating the need to
disconnect cables or disturb the electrical installation when changing
a controller.
A configuration reference card is located in the slot behind the hinged
flap at the top of the controller's front panel. It lists the controller
functions and tuning parameters. Space is provided for the user to
indicate the configuration and tuning values currently entered in the
controller.
DPRSOO Specifications
CONTROL FUNCTIONS
PID function as standard
Manual or autotuner PID parameter setting
Gain scheduling via as many as three different
parameter settings
Feedforward function selection
CONTROL RANGE
Amplification (Gain) between 0.01 and 99.99
Integral time (Reset) between 0.1 and 9999 seconds or
disabled (OFF )
Derivative time (Rate) between 0 and 9999 seconds
Direct or reversed control action
Full alarm and fault indications.
CONTROLLER FUNCTIONS
Process Value
Linearization, filtering, and direct temperature inputs for
a Pt-100 RTD or Type J, K, R or S thermocouple
User-configurable input signal range
Process variable calculation function
May 1991