Siemens 353 User Manual

UM353-1B Installation
April 2012
7-13
7.4.4 Digital Input and Output Wiring
Connections to Digital Input and Digital Input Universal function blocks are shown in Figure 7-11. Wiring for
internal and external power sources is shown. Semiconductor devices can replace the mechanical switches shown.
Wiring guidelines are found in Section 7.4.1.
Digital input commons, e.g. DIN1 (-), are isolated from station common and from case/safety ground.
5
Common Ground Bus
26 Vdc
Earth
Ground
Common
9*
* Or any station common terminal
** See Table 7-1 for DIN3 terminals.
Controller Circuitry
+
_
(+)
(-)
11
12
(+)
(-)
13
14
+
_
24V
External
Supply
DIN1
DIN2
MG00510b
Transmitter
Supply
Model 353
Rear Terminals**
Common Ground Bus
26 Vdc
Earth
Ground
Common
40**
Controller Circuitry
+
_
(+)
(-)
36
(+)
(-)
37
38
+
_
24V
External
Supply
DINU1
DINU2
MG000713b
35
39
Current
Limiter*
* Limits current to 6 mA maximum.
Current
Limiter*
Transmitter
Supply
Model 353
Rear Terminals***
** Or any station common terminal.
*** See Table 7-1 for DIN3 terminals
A. DIN1 and 2 B. DINU1 and 2
Figure 7-11 Digital Inputs DIN and DINU
Digital output wiring is shown in Figure 7-12. Three diagrams are provided showing current and voltage outputs.
Note the use of transient suppression diodes in Figure 7-12C. Always install a transient suppression component
across a reactive component, such as a relay coil, to protect the semiconductor devices in the Siemens 353.
Digital output common, DOUTC, is connected to station common.

Siemens 353 Specifications

General

Brand	Siemens
Model	353
Category	Controller
Language	English