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Installation
8.4.4 Digital Input and Output Wiring
Connections to Digital Input and Digital Input Universal function blocks are shown in Figure 8-14. Wiring for
internal and external power sources is shown. Semiconductor devices can replace the mechanical switches shown.
Wiring guidelines are found in Section 8.4.2.
Digital input commons, e.g. DIN1 (-), are isolated from station common and from case/safety ground.
Model 353
Rear Terminals
Transmitter
Supply
26 Vdc
11
24V
12
External
Supply
13
14
Common Ground Bus
Earth
Note: See Table 8.1 for
Ground
A. DIN1 and 2
Digital output wiring is shown in Figure 8-15. Three diagrams are provided showing current and voltage outputs.
Note the use of transient suppression diodes in Figure 8-15C. Always install a transient suppression component
across a reactive component, such as a relay coil, to protect the semiconductor devices in the Moore 353.
Digital output common, DOUTC, is connected to station common.
8-16
_
+
5
9
Common
(+)
DIN1
(-)
(+)
DIN2
(-)
DIN3 terminals.
FIGURE 8-14 Digital Inputs DIN and DINU
Model 353
Rear Terminals
Transmitter
Supply
39
26 Vdc
40
35
24V
36
External
Supply
37
38
Common Ground Bus
Earth
* Limits current to 6 mA maximum.
Ground
B. DINU1 and 2
UM353-1
_
+
Common
Current
(+)
Limiter*
DINU1
(-)
Current
(+)
Limiter*
DINU2
(-)
March 2003
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