Siemens SIMATIC ET 200SP Manual page 12

Wiring
3.1 Wiring and block diagram
Wiring: Current measurement 2-wire and 4-wire connection (2-wire and 4-wire transducer)
The following figure shows the block diagram and an example of the terminal assignment of
the analog input module AI 2xI 2-/4-wire ST on the BaseUnit BU type A0/A1.
①
2-wire connection for current measurement (2-
wire transducer)
②
4-wire connection for current measurement (4-
wire transducer)
③
Backplane bus interface
④
Analog-to-digital converter (ADC)
⑤
Current limitation
⑥
Switchover 2-wire / 4-wire
⑦
Color-coded label with color code CC05 (op-
tional)
⑧
Temperature recording for BU type A1 only
(function cannot be used for this module)
⑨
Filter connection supply voltage (only when
light-colored BaseUnit is present)
I + Current input positive, channel n
n
I - Current input negative, channel n
n
Image 3-1 Wiring and block diagram for current measurement 2-wire and 4-wire connection (2-wire and 4-wire
transducer)
12
1U Supply voltage (2-wire transducer), channel n
n
2U Supply voltage (4-wire transducer), channel n
n
RES Reserve, must remain unused for future function
extensions
2M Reference potential (4-wire transducer)
n
L+ 24 V DC (infeed only with light-colored BaseUnit)
P1, P2, AUX Internal self-assembling voltage buses
Connection to left (dark-colored BaseUnit)
Connection to left interrupted (light-colored Ba-
seUnit)
DIAG Diagnostics LED (green, red)
AI0, AI1 Channel status LED (green)
PWR Power LED (green)
Analog input module AI 2xI 2/4-wire ST (6ES7134-6GB00-0BA1)
Manual, 12/2015, A5E36104399-AA