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| 型號(hào)： | AN-535 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Digital Input/Output Subsystems |
| 中文描述： | 數(shù)字輸入/輸出子系統(tǒng) |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 339K |
| 代理商： | AN-535 |
–5–
AN-535
Attaching Digital I/O Applications to the DB-24 I/O
Backplane
Use the DB-24 Digital I/O Backplane for high level ac or
dc signals. Connect applications to the backplane
through the barrier strip. The barrier strip contains stan-
dard slot-head screw terminals, six screws for each
4-channel (quad) I/O module. Use 22-14 AWG twisted-
pair wire, and strip the wire back approximately
0.25-inch (6.3 mm). Four consecutive input or output ap-
plications are attached to a single quad module, with
two channels sharing the same common in the module.
The two common connections for each module are con-
nected to one another on the DB-24 backplane. There-
fore, each of the four individual channels on the module
can use either of its two common connections. Since the
commons are connected, you must make sure that all of
the applications attached to a 4-channel module share
the same common voltage reference. If two applications
use different common voltage references, the applica-
tions must be attached to two different modules. Figure
6 illustrates how the channels and their commons are
connected.
1
3
2
4
0–3
1
2
C
C
3
4
1
2
3
8
9
10
I/O
CHANNEL COMMON
2
C
4
1
C
3
Figure 6. DB-24 Backplane Common Connections
Figure 7 illustrates high level ac and dc digital wiring us-
ing input and output modules on the DB-24 backplane.
Example 7a illustrates turning a lamp on and off, and
example 7b illustrates monitoring whether the lamp is
on or off. Example 7c illustrates turning a relay coil on
and off, and example 7d illustrates monitoring whether
or not the relay coil is being energized.
NOTE:
The channels on the screw terminals on the DB-24 back-
plane are labeled from 1–24, while the channels for the
I/O modules are labeled 0–23. Keep this distinction in
mind when installing your field wiring applications.
1
3
2
4
0–3
1
2
C
C
3
4
115V AC
CURRENT
LIMIT
RESISTOR
1
115V AC
+24V DC
2
RELAY
COIL
3
NOTES:
1
SHOULD NOT EXCEED 3A.
2
USER SUPPLIED DIODE NECESSARY FOR INDUCTIVE SPIKE DAMPING.
3
RELAY COIL AMPERAGE SHOULD NOT EXCEED OUTPUT MODULE RATING.
4
MODULES ARE COLOR CODED: AC INPUT
AC OUTPUT– YELLOW
DC INPUT
DC OUTPUT
– WHITE
– RED
a. AC Output
b. AC Input
c. DC Output
d. DC Input
1
3
2
4
0–3
1
2
C
C
3
4
1
3
2
4
0–3
1
2
C
C
3
4
1
3
2
4
0–3
1
2
C
C
3
4
I
L
115V DC
Figure 7. Typical High Level Digital I/O Wiring Using the DB-24 and 4-Channel Solid State Relay Modules
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