Siemens ET 200SP Manual page 15

Connection: 2-wire and 3-wire connection
The following figure shows the block diagram and an example of the terminal assignment of
the digital input module DI 4x120..230VAC ST on the BaseUnit BU type B1 without
AUX terminals (2-wire and 3-wire connection).
①
2-wire connection
②
3-wire connection
③
Backplane bus interface
④
Input electronics
⑤
Color identification label CCxx (optional)
P1, P2, AUX Internal self-assembling voltage buses
Connection to left (dark-colored BaseUnit)
Connection to left interrupted (light-colored
BaseUnit)
.0 to .3 Channel status LED (green)
Figure 3-1 Wiring and block diagram for 1-wire and 2-wire connection of encoders
Digital input module DI 4x120..230VAC ST (6ES7131-6FD01-0BB1)
Manual, 09/2017, A5E32043398-AC
3.1 Wiring and block diagram
DI Input signal, channel n
n
L1 Encoder supply, channel n
1L / 2L Infeed 120 ... 230 V AC
1N / 2N N-conductor connection
DIAG Error or Diagnostics LED (green, red)
PWR Power LED (green)
Wiring
15