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Card Connections and Installation
4-17
Logic device control —
Figure 4-17 shows a digital output
connection scheme to control a logic device. This example
assumes that an in5V voltage source is being used.
Figure 4-17
Digital output, logic device control
The logic device is a demultiplexer (DMUX). The binary
pattern (value) seen at the input of the DMUX (lines A, B,
and C) determines which DMUX output line (Y0 through
Y7) is selected (pulled low). For example, with channels 1,
2, and 3 off (open), lines A, B and C are high. The binary 7
at the DMUX input (A = 1, B = 1 and C = 1) selects (pulls
low) output Y7. If channel 2 is turned on (closed), line B goes
low. The binary 5 seen at the DMUX input (1, 0, 1) selects
(pulls low) Y5.
Input connection scheme
Figure 4-18 shows a digital input connection scheme to mon-
itor the state of micro-switches. With a switch open and the
input resistor configured for pull up as shown in Figure 4-
18a, the corresponding input channel is pulled high by the
internal input resistor. As a result, the input channel is high
(appears as a bar on the Model 7001 display or a lit LED on
the Model 7002). When a switch is closed, the corresponding
input channel is pulled low to ground. As a result, the input
channel is low (appears as a single dot on the Model 7001
display or an unlit LED on the Model 7002).
Figure 4-18
Digital input, monitoring micro-switches
With a switch open and the input resistance configuration set
to pull down as shown in Figure 4-18b, the corresponding
input channel is pulled low by the internal input resistor. As
a result, the input channel is low. When a switch is closed, the
corresponding input channel is pulled high. As a result, the
input channel is high.
For more information on configuring pull-up resistance,
refer to the Configuring digital I/O input pull-up resistance
paragraph.
7022
INTERNAL CONNECTIONS:
INTERNAL VOLTAGE SOURCE (+5V) USED.
+5V
GND
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
LOGIC DEVICE
74LS138
DMUX
VCC
GND
A
B
C
G2A
OUT 31
OUT 32
OUT 33
IN 2
IN 1
MICRO-
SWITCHES
7022
IN 3
GND
A. INPUT RESISTOR IS SET TO PULL UP.
IN 2
IN 1
MICRO-
SWITCHES
7022
IN 3
B. INPUT RESISTOR IS SET TO PULL DOWN.
+V
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Содержание 7022
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