Digital Input/Output Modules
8–6
1070 072 145-102 (01.07) GB
8.3.3 X11B, X12B Outputs
All outputs share a common 24 V and 0 V potential.
Thanks to the low leakage current of 0.5 A, an output can be connected to an
input.
The outputs are protected against short-circuit and overtemperature. A cur-
rent in excess of 0.6 A triggers the electronic monitor, switching off only the
faulty output. Once the cause of the fault has been removed, the output will
again be enabled automatically.
A short-circuit is indicated by the output LED which remains extinguished alt-
hough the output has been enabled by the PLC.
Groups of up to four outputs can be parallelled within the following ranges to
a total current of up to 2 A:
D X11B0 through X11B3
D X11B4 through X11B7
D X12B0 through X12B3
D X12B4 through X12B7
Output circuit diagram:
0 V_B
Out_B
24 V_B
Inductive load at output
Inductive loads such as solenoid valves or contactors must be provided with
a damping network directly at the load. Otherwise, any interruption in the line
interconnecting an output with an inductive load will generate a high level of
interference. In disfavourable circumstances this disturbance may lead to
system malfunctions.
A damping network must be present especially in cases where a switch is
connected in series with the inductive load (safety interlock).
. All commercially available damping networks may be utilized.
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