Table 12-1. Cs21 Control Signals - ABB ControlIT 53MC5000 Instruction Manual

12.2 CS21 CONTROL SIGNALS
Loading CS21 connects the 53MC5000 Controller function blocks for operation as a Two Loop Cas-
cade Controller. As shown in Figure 12-1, CS21 provides ten control signals which are described
in Table 12-1.

Table 12-1. CS21 Control Signals

Control
Signal
AI0 - Process This analog input signal represents the value of
Variable the primary process loop to be manipulated by
(Primary) the controller. It is compared to the primary
control setpoint to determine the setpoint value
for the secondary process loop.
AI1 - Remote This analog input signal represents the value to
Setpoint be used as the primary loop control setpoint
Primary when remote setpoint operation is selected with
the faceplate push buttons and enabled by DI0.
AI2 - Process This analog input signal represents the value of
Variable the secondary process loop to be manipulated
(Secondary) by the controller. It is compared to the
secondary control setpoint to determine the
Control Output (Secondary).
AI3 - Additive This analog input signal value is added to the
Feed Forward secondary PID result to make up the Control
Secondary Output value when Auto operation is active.
AO0 - Control This is the 4-20 mA output signal that drives the
Output final control element.
(Secondary)
AO1 - This output signal reflects the setpoint input
Secondary value to the secondary from the primary output.
Setpoint
Transmit
DI0 - When a closed contact is present on this input,
Cascade cascade operation is enabled if the R/L push
Enable button is in Remote.
DI1 - Remote When a closed contact is present on this input,
Enable the operator can select the setpoint value to be
Primary set by the value of the Remote Setpoint
Primary input with the R/L push button.
DO0 - Process This contact is closed when the secondary loop
Alarms Process Variable value is not within the C103
Secondary and C104 datapoint values (secondary loop
Alarm Limits 1 and 2); otherwise, the contact is
open.
12-2
53MC5000 Process Control Station
Definition
Cord Rear
Set Term
ITB Board
TB1-1 (+) 1 (+)
TB1-2 (-) 2 (-)
TB1-3 3
TB1-5 (+) 4 (+)
TB1-6 (-) 5 (-)
TB1-7 6
TB1-9 1
TB1-10 (+) 7 (+)
TB1-11 (-) 8 (-)
TB1-13 4
TB1-14 (+) 9 (+)
TB1-15 (-) 8 (-)
TB1-17 (+) 10 (+)
TB1-18 (-) 11 (-)
TB1-19 (+) 12 (+)
TB1-20 (-) 11 (-)
TB2-1 (+) 13 (+)
TB2-2 (-) 14 (-)
TB2-3 (+) 15 (+)
TB2-4 (-) 14 (-)
TB2-5 (+) 16 (+)
TB2-6 (-) 17 (-)
1 of 2
Signal
+24 V
AI0
SC
+24 V
AI1
SC
+24 V
AI2
SC
+24 V
AI3
SC
AO0
PC
AN01
PC
DI0
PC
DI1
PC
DO0
PC