Siemens SIMATIC Manual page 16

Wiring
3.1 Wiring and block diagram
Connection: 3-wire connection
The following figure shows the block diagram and an example of the terminal assignment of
the digital input DI 8x24VDC SRC BA on the BaseUnit BU type A0 with AUX terminals (3-
wire connection).
①
3-wire connection
②
Color identification labels CCxx (optional)
③
Filter connection supply voltage (only when light-colored BaseUnit is present)
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
1 A to 10 A AUX terminals
P1, P2, AUX Internal self-assembling voltage buses
Connection to left (dark-colored BaseUnit)
Connection to left interrupted (light-colored BaseUnit)
Figure 3-2 Wiring and block diagram for 3-wire connection of encoders
16
Digital output module DI 8x24VDC SRC BA (6ES7131-6BF61-0AA0)
Manual, 09/2017, A5E32855511-AC