Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Installation - Manual (Page 60)

The following options and characterization parameters are available in each PID control algorithm.
Data point references are for control loop 0. Data points for additionally available control loops are
indicated in the module table.
PROPORTIONAL BAND:
The parameter PB (C106) modifies the controller response in standard PID terms. It is the percent
of error required to move the output full scale.
RESET TIME:
The TR parameter (C107) modifies the controller response in standard PID terms. The value repre-
sents the number of minutes per repeat.
DERIVATIVE TIME:
The TD parameter (C108) modifies the controller response in standard PID terms. The value en-
tered represents the minutes that proportional action is advanced.
DIRECT/REVERSE CONTROL ACTION:
The control action is determined by the configuration of the reverse action select (L106). When set
to a 0 the controller output increases as the process value increases. When set to a 1 the control-
ler output decreases as the process value increases.
CONTROLLER SPAN AND ZERO:
Control span (C115) and zero (C116) establish the upper and lower range of the controller. These
permit the control action to be defined over an range independent of the process variable input
range. The control span parameter also determines the speed at which the setpoint changes when
the up and down arrow buttons are pressed.
CONTROL ZONE:
This parameter (C114) defines a gap or dead band on either side of the setpoint. When the proc-
ess variable is within this gap control output changes are suppressed.
SETPOINT SLEW RATE:
Parameter T1 (C117) imposes a ramp limit on the setpoint. When configured to a non-zero value
the setpoint used in the PID algorithm is only allowed to change by that amount each scan time.
The final value of the setpoint is always displayed on the units display.
REMOTE SETPOINT MODIFIERS:
B1 (C112) and K1 (C113) modify the remote setpoint input prior to being used in the setpoint gener-
ator. Setpoint = Remote Setpoint(RSP)
*
Ratio(K1) + Bias(B1).These parameters allow the
Remote Setpoint input to be configured to reflect the signal source.
REMOTE SETPOINT ENABLE:
When the Remote Setpoint Enable bit RE (L115) is a 1 the modified RSP is allowed to become the
setpoint value of the setpoint generator based on the R/L pushbutton or if the remote switch SWR
(L113) is a 1.
SETPOINT MODE INDEX:
This parameter(B338), specifies how the SP increase and decrease buttons function when in re-
mote. When the controller is in REMOTE the following applies.
0 = pushbuttons have no effect
1 = pushbuttons adjust K1
2 = pushbuttons adjust B1
MODULAR CONTROLLER QUICK START
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