Siemens SIMATIC Manual page 15

Connection: 1-wire and 2-wire connection
The following figure shows the block diagram and an example of the terminal assignment of
the digital input module DI 8x24VDC SRC BA on the BaseUnit BU type A0 without AUX
terminals (1-wire and 2-wire connection).
①
1-wire connection
②
2-wire connection
③
Backplane bus interface
④
Input electronics
⑤
Color identification label CCxx (optional)
⑥
Filter connection supply voltage (only when
light-colored BaseUnit is present)
P1, P2, AUX Internal self-assembling voltage buses
Connection to left (dark-colored BaseUnit)
Connection to left interrupted (light-colored
BaseUnit)
Figure 3-1 Wiring and block diagram for 1-wire and 2-wire connection of encoders
Digital output module DI 8x24VDC SRC BA (6ES7131-6BF61-0AA0)
Manual, 09/2017, A5E32855511-AC
3.1 Wiring and block diagram
DI Input signal, channel n
n
24 V DC Encoder supply, channel n
L+ 24 V DC (feed for light-colored BaseUnit
only)
M Ground
DIAG Error or Diagnostics LED (green, red)
.0 to .7 Channel status LED (green)
PWR Power LED (green)
Wiring
15