Siemens SIMATIC ET 200SP F-AI 4xI 0(4) 20mA 2-/4-wire HF Series - Page 17

Connecting
3.1 Wiring and block diagram
Analog input module F-AI 4xI 0(4)..20mA 2-/4-wire HF (6ES7136-6AA00-0CA1)
Manual, 08/2018, A5E41448857-AB
17
①
Backplane bus interface
U
V
Sensor supply
②
Analog-to-digital converter (ADC)
M
Supply voltage ground
③
Sensor supply/reverse polarity protection
M
n
Ground to channel n
④
Temperature measurement for BU type
A1 only (the function cannot be used for
this module.)
L+ 24 V DC (infeed only with light-colored
BaseUnit)
⑤
Color-coded label with color code CC00
(optional)
P1, P2,
AUX
Internal self-assembling voltage buses
Connection to left (dark-colored BaseUnit)
Connection to left interrupted (light-colored
BaseUnit)
⑥
Filter connection supply voltage (available
with light-colored BaseUnit only)
DIAG Diagnostics LED (green, red)
I
n
+ Current input positive, channel n AI0, AI1,
AI2, AI3
Channel status LED (green)
I
n
- Current input negative, channel n F0, F1,
F2, F3
Channel fault LED (red)
PWR
Power LED (green)
Figure 3-1 Block diagram
Sensor supply
WARNING
Voltage dips and voltage fluctuations of the voltage supply are not buffered by the F-
module and, thus, affect the sensor supply.
This can cause the measured value to be false and must be taken into account when
determining the safety function.
To ensure that the sensor functions problem-free, we recommend one of the following
options:
• You can avoid voltage dips by using a voltage supply according to the NAMUR
recommendation NE 21.
or
• Use a transducer with an appropriate battery backup or diagnostics.