This example shows a plant with the heating, cooling and dehumidification
functions.
Application example
Assignments:
– Control loop 1 (room temperature) with sequence 1 (heating) and sequence 4
(cooling)
– Control loop 2 (room humidity) with sequence 4 (dehumidification)
– Both controllers (sequences 4) command load output AO2, which transmits the
resultant signal to the air cooling valve via output Y2.
CTLOOP 1
y2
y
xxxx x
SEQ1 Y
SEQ1 P
SEQ4 Y
SEQ4 P
9.5.6 Pump outputs
Only one pump can be assigned to each sequence. However, each pump can be
controlled by up to 2 sequences.
Possibilities
This example shows an air heating coil with a valve and pump. Both are controlled
by sequence 2; the pump is controlled via pump output SEQ2 P:
Application example
Y1
DO
Q1
AO
p
xxxx
DIFF
x
Q
MAIN
LIM SEQLIM
SHIFT
2CTLOOP 2
DV ALM
SEQ2 Y
SEQ2 P
SEQ1 Y
SEQ1 P
1
y2
IN X
x
A0
AO 1
p2
PUMP 1
PUMP 1
y
3101S27
116 / 174
Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Controller (CTLOOP x) 29.08.2008
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