Specifying Graphics (I/O Summaries) - Honeywell AUTOMATIC CONTROL SI Edition Engineering Manual

100
33
0
26
26
ENABLED
BY REMOTE
CONTROLS
ENABLED

SPECIFYING GRAPHICS (I/O SUMMARIES)

When writing the control sequence of operation, sketch the
graphic (Fig. 7) and note the necessary inputs and outputs
required for control. Develop an Input/Output (I/O) Summary
(Fig. 8) where, the X-axis lists generic types of points and the
ENGINEERING MANUAL OF AUTOMATIC CONTROL
100
33
26
COOLING
TOWER
CONTROL
CHILLED WATER SETPOINT
7 8 11
MINIMUM ACTUAL MAXIMUM
CHILLER 1
33
ON 100
AUTO
MAX
OPERATING
STATUS
MODE CURRENT
AUTO OFF
100
CHILLER 2
30
Fig. 7. Graphic Sketch for Sequence of Operation.
BUILDING MANAGEMENT SYSTEM FUNDAMENTALS
DUAL CHILLER PLANT
CONTROL
0
GRAPHIC DISPLAY
LEAD CHILLER
SELECTOR
1
1 = CHILLER 1 LEADS
2 = CHILLER 2 LEADS
PRESSURE
7
AUTO
78
NORMAL
%
ALARM
LOAD STATUS
00
NORMAL
13
AUTO
Y-axis lists the specific points. Publishing the graphic sketch
with all hardware and software points and symbols is an
excellent alternative to the I/O summary.
193
PRESSURE BYPASS
& CHOKE VALVE
CONTROL
DUAL CHILLER
SETPOINT
REDUCTION
72.4
BYPASS
365
VALVE
00
365
7.3
PRESSURE
13.0
CHOKE
VALVE
CHILLER
CONTROL
SETPOINTS/
SEQUENCES
kPa
100
TO
AHUs
M15136