Siemens SIMATIC ET 200SP DI 8x24VDC ST Manual page 14

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 ST 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 Ba-
seUnit)
Figure 3-1 Wiring and block diagram for 1-wire and 2-wire connection of transducers
Digital input module DI 8x24VDC ST (6ES7131-6BF01-0BA0)
Manual, 02/2019, A5E03574157-AF
3.1 Wiring and block diagram
DI Input signal, channel n
n
24 V DC Transducer 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 up
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