Digital Input/Output Modules
8–4
1070 072 145-102 (01.07) GB
8.3 Connection
Connection via push-lock terminals:
D Max. cable cross-section : 1,5 mm@
D Max. terminal current : 8 A
D Polarity reversal of the 24 V power supply along with a simultaneous
short-circuit on one of the outputs will destroy the module
D Polarity reversal of the 24 V power supply along with the connection of
diode-type fuses with rated voltages below 30 V may destroy the module.
8.3.1 X10 Power Terminals
The external 24 V power supply is connected, separately for inputs and out-
puts, to the X10 power terminal.
24V_B
X10
24 V power supply, O0 through O7 / O15
not used
0V_A
0V_B
0 V Reference for O0 through O7 / O15
0 V Reference for I0 through I15
The inputs and outputs are separately powered via the X10 plug connector,
each with 0V_A (0 V reference for input circuits – A), plus 24V_B and 0V_B
(24 V power supply and 0 V reference for output circuits– B). There is no
electrical connection on the module between input and output circuits. For
this reason, and provided that there are two separate power supplies, the
outputs can be disabled in an Emergency-STOP situation, for example, lea-
ving the inputs functional. It is however possible, to operate both inputs and
outputs on a common power supply.
8.3.2 X21A, X22A Inputs
All of the 16 inputs share a common 24 V and 0 V potential.
An input can be connected to an output without additional load.
Any 2-wire proximity switch meeting the following requirements can be con-
nected:
D Closed-circuit current v 2,6 mA
D Voltage drop v 6 V
D Holding current refer to input characteristic
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