Function Parameter Reference Guide
12/00 UDC2300 Controller Product Manual 127
12.2.20 ComADD (STATION ADDRESS)
This prompt is part of the Communications Set up group.
This is a number that is assigned to a controller that is to be used with the
communications option. This number will be its address.
Range of Setting: 1 to 99
12.2.21 ComSTA (COMMUNICATIONS STATE)
This prompt is part of the Communications Set up group.
This prompt lets you select the type of communications protocol.
Selections Definitions
DIS
Disable
R422
RS-422/485 ASCII - Allows RS422/485 ASCII communication prompts
.
MODB
MODBUS - Allows Modbus RTU communication prompts
12.2.22 CSP BI (COMPUTER SETPOINT BIAS)
This prompt is part of the Communications Set up group.
Computer setpoint bias
Range of Setting: -999 to 9999 in Engineering Units
12.2.23 CTRALG (CONTROL ALGORITHM)
This prompt is part of the Algorithm Set up group.
This prompt lets you select the type of control that is best for your process.
Selections Definitions
ONOF
ON/OFF is the simplest control type. The output can be either ON (100 %)
or OFF (0 %). The Process Variable (PV) is compared with the setpoint (SP)
to determine the sign of the error (ERROR = PV-SP). The ON/OFF
algorithm operates on the sign of the error signal.
In Direct Acting Control, when the error signal is positive, the output is
100 %; and when the error signal is negative, the output is 0 %. If the
control action is reverse, the opposite is true. An adjustable overlap
(Hysteresis Band) is provided between the on and off states.
Other prompts affected: “HYST”
DUPLEX ON/OFF is an extension of this algorithm when the output is
configured for Duplex. It allows the operation of a second ON/OFF output.
There is a deadband between the operating ranges of the two inputs and an
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