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Card Connections and Installation
2-8
Motor control —
Figure 2-11 shows a digital output connec-
tion scheme to control small 12V dc motors. An external 12V
voltage source is used to provide the necessary voltage level.
This example assumes that the pull-up resistors for channels
17 and 18 (R182) are removed.
A motor is turned on when the corresponding output channel
is turned on (closed).
Logic device control —
Figure 2-12 shows a digital output
connection scheme to control a logic device. This example
assumes that the internal 5.3V voltage source is being used,
and the pull-up resistors for channels 25, 26 and 27 (R183)
are installed.
OUT 1
V
EXT1
SOLENOIDS
7020
OUT 2
OUT 3
GND
24V
+
–
INTERNAL CONNECTIONS:
EXTERNAL VOLTAGE SOURCE (V
EXT1
) SELECTED.
PULL-UP RESISTORS (R180) REMOVED.
Figure 2-9
Digital output, solenoid control
Figure 2-10
Digital output, relay control
5.3V
RELAY COILS
7020
INTERNAL CONNECTIONS:
INTERNAL VOLTAGE SOURCE (5.3V) SELECTED.
PULL-UP RESISTORS (R181) REMOVED.
OUT 9
OUT 11
OUT 10
OUT 17
V
EXT2
MOTORS
7020
OUT 18
GND
12V
+
–
INTERNAL CONNECTIONS:
EXTERNAL VOLTAGE SOURCE (V
EXT2
) SELECTED.
PULL-UP RESISTORS (R182) REMOVED.
M
M
Figure 2-11
Digital output, motor control
OUT 25
7020
OUT 26
INTERNAL CONNECTIONS:
INTERNAL VOLTAGE SOURCE (5.3V) SELECTED.
PULL-UP RESISTORS (R183) INSTALLED.
OUT 27
5.3V
GND
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
LOGIC DEVICE
74LS138
DMUX
V
CC
GND
A
B
C
G2A
Figure 2-12
Digital output, logic device control