Siemens SIMATIC ET 200S - Block Diagram of the 4 AI I 2 WIRE Standard

Analog Electronic Modules
12-59
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
Table 12-40 Terminal assignment of the 4AI I 2WIRE Standard, continued
View RemarksTerminal assignment
M
1--
M
0--
2
3
4
6
7
8
1
5
M
1+
M
0+
M
3+
M
2+
TM-E15S26-A1 and 4AI I 2WIRE Standard
CH1CH0
mA
AUX1
A
4
A
3
A
8
A
7
AUX1
AUX1
AUX1
M
3--
M
2--
CH3CH2
Channel 0: Terminals 1 and 2
Channel 1: Terminals 5 and 6
Channel 2: Terminals 3 and 4
Channel 3: Terminals 7 and 8
M+: Input signal ”+”
M--: Input signal ” --”
The 2-wire transducers are
powered over the
measurement leads.
Block diagram
Backplane bus
ET 200S
backplane bus
interface
connection
M
ANA
DC/DC converter
L+
1M
1
2
5
6
Short-circuit
protection
P1
P2
ADC
3
4
7
8
M
0
+
M
0
--
M
1
+
M
1
--
M
2
+
M
2
--
M
3
+
M
3
--
Input current
limit
I I I I
Electrical
isolation
Figure 12-11 Block diagram of the 4AI I 2WIRE Standard