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• It is not possible to connect a 2-wire BERO.
• Power supply for digital inputs (X111, X222, X333: pin 2):
The internal power supply (P24OUT) is taken from the general power supply of module X1,
pin 2 (P24). Alternatively, an external power supply can be connected if the load at the digital
outputs becomes too high.
Table 12-26
Digital inputs
High-level voltage (U
Input current I
Low-level voltage (U
Signal delay time T
Signal delay time T
Specification of the digital outputs
Terminal assignment for the digital outputs
The following figure shows an example of the terminal assignment for the digital outputs on
connector X111. Connectors X222 and X333 are assigned analogously.
Characteristics
• No galvanic isolation.
• Protection against: Short-circuit, overtemperature, and loss of ground.
• Automatic disconnection in case of undervoltage.
NCU 1740
Equipment Manual, 09/2022, A5E51087503B AC
Electrical specification of the digital inputs:
)
H
at V
IN
H
)
L
PHL
at X222: DI 3.0 to 3.7
PHL
:
:
:
:
1
(M)
Connectable components
12.2 PP 72/48D PN and PP 72/48D 2/2A PN
min.
max.
15 V
30 V
2 mA
15 mA
-3 V
+ 5 V
0.5 ms
3 ms
--
--
Nominal
24 V
--
0 V
--
600 μs
131
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