Siemens 353 - Page 179

UM353-1B Installation
April 2012
7-11
Common Ground Bus
Earth
Ground
20
+
_
Model 353
Rear Terminals
18*
Controller Circuitry
Analog Signal,
4-Wire Transmitter,
4-20 mA Output
External Devices
1-5 Vdc
22
+
_
23
+
_
24*
MG00604a
External
Power
Source
AIN1
AIN2
AIN3
* Or any station common terminal - see Table 7-1
for additional station common terminals
Analog Signal,
4-Wire Transmitter,
4-20 mA Output
Analog Signal,
4-Wire Transmitter,
4-20 mA Output
1-5 Vdc
1-5 Vdc
6
21*
Station Common
250
250
250
Figure 7-7 Analog Inputs AIN1, 2, and 3; 4-Wire Transmitters
45
46
47
48
Controller Circuitry
4-20 mA
Source
+
_
Ground
Isolated
Ground
Isolated
Power
Note: See Table 7-1 for AINU2 terminals.
MG00508a
Universal
Converter,
Isolated
Inputs
Model 353
Rear Terminals
3.75
45
46
47
48
Controller Circuitry
Millivolt
Source
+
_
Ground
Isolated
Ground
Isolated
Power
Note: See Table 7-1 for AINU2 terminals.
MG00509a
Universal
Converter,
Isolated
Inputs
Model 353
Rear Terminals
A. 4-20 mA Input
B. Millivolt Input
Figure 7-8 Universal Analog Input AINU1
2. 4-20 mA Input Only - Select a precision (0.1%) 250Ω (for AIN#) or 3.75Ω
(for AINU#) resistor from the installation kit and insulate the bent resistor lead
with a piece of sleeving. At the lead end, approximately 1/4" (6 mm) to 5/16"
(8 mm) of bare resistor lead should be exposed.
If a crimp-on connector is to be used, go to step 3. Otherwise, go to step 4.
0.5"
(12.7mm)
0.8"
(20.3mm)
Place sleeving
on this lead.