Siemens SIMATIC ET 200SP Manual page 16

Wiring: Current measurement 2-wire and 4-wire connection
The following figure shows the block diagram and an example for the terminal assignment of
the analog input module AI 2xU/I 2-/4-wire HS on the BaseUnit BU type A0/A1.
①
2-wire connection for current measurement
②
4-wire connection for current measurement
③
Backplane bus interface
④
Analog-to-digital converter (ADC)
⑤
Current limitation
⑥
Color identification label CCxx (optional)
⑦
Temperature recording for BU type A1 only
(function cannot be used for this module)
⑧
Supply voltage filter circuit (only when light
BaseUnit is present)
U Encoder supply external
ext
I + Current input positive, channel n
n
I - Current input negative, channel n
n
Figure 3-2 Wiring and block diagram for current measurement 2-wire and 4-wire connection
Analog input module AI 2xU/I 2-/4-wire HS (6ES7134-6HB00-0DA1)
Manual, 09/2018, A5E03576060-AF
U + Voltage input positive, channel n
n
U - Voltage input negative, channel n
n
U Supply voltage, channel n
Vn
RES Reserve, must remain unused for future func-
tion extensions
M Reference ground to U
n
L+ 24 V DC (infeed only with light BaseUnit)
P1, P2, AUX Internal self-assembling voltage buses
Connection to left (dark BaseUnit)
Connection to left interrupted (light BaseUnit)
DIAG Diagnostics LED (green, red)
AI0, AI1 Channel status LED (green)
F0, F1 Channel fault LED (red)
PWR Power LED (green)
Connecting
3.1 Wiring and block diagram
, channel n
Vn
15