CEMP-E
TI 810-11
30 November 1998
Standard features will allow the replacement of any controller by a spare not necessarily of the same
manufacturer.
(3) The single-loop digital controller will have the following inputs and outputs:
(a) A process variable analog input (PV).
(b) A remote setpoint analog input for control point adjustment (CPA).
(c) An analog output (OUT).
(d) A process variable actuated contact closure output (PV contact).
(e) A contact output that responds to the difference between PV and CPA analog inputs (DEV
contact).
(f) An analog output which is identical to the process variable input (PV Retransmission).
(4) Some controller features are configurable by manual input, and others are selectable by
setting switches or jumper wires. The configuration methods vary with the specific manufacturer and
model. The controller will have the selection of features for its inputs and outputs as shown in table 2-1.
TABLE 2-1
CONTROLLER FEATURES
Input
Output
Feature
PV
Scalable to the range of the input transmitter.
CPA
Adjustable bias of setpoint relative to the PV input range.
CPA
Adjustable ratio of setpoint relative to the PV input range.
CPA
Scalable to the range of the CPA input signal.
CPA
High and low limits of setpoint adjustment.
OUT
Selection of direct acting or reverse acting.
OUT
Adjustable high and low limits.
OUT
Adjustable bias (Manual reset).
OUT
Selection of manual or automatic control.
OUT
Selection of proportional (P), proportional plus integral (PI), and
proportional plus integral plus derivative control modes (PID).
OUT
Anti-reset windup.
OUT
Selection of manual tuning or operator initiated self tuning.
OUT
Manual reset feature for use when the controller is configured
from porportional mode only and is manually tuned.
PV Contact
Adjustable contact setpoint.
2-9
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