Connection Of Outputs In Parallel And Switching On The Load Via A Contact - Siemens S5-135U/155U System Manual

Digital Input/Output Modules
8.2.5 Connection of Outputs in Parallel and Switching On the Load via
a Contact
Caution
!
The parallel connection of outputs to increase the load is not permissible.
Digital Output
Outputs of modules with the same load voltage supply may be connected in
Modules for DC
parallel without additional circuitry.
Voltage
An external diode must be fitted to the output lines of modules fed from
different load voltage supplies (exception: 453, 457). In the case of different
logic states of the two outputs, the maximum permissible output current
corresponds to that of the lower stage.
The contact (e.g. for manual operation) is connected to one of the two L+.
2L+
Output 1
2L–
Figure 8-10 Parallel Connection of Outputs for DC Voltage Outputs
Digital Output
Outputs can be connected in parallel without increasing the load if they are
Modules for AC
connected to the same phase (L) and the same neutral conductor (N).
Voltage
The load must be at least 50 mA per output to keep to the permissible
residual voltage at logic 0. The maximum switching current of 2 A per load
must not be exceeded.
8-22
Manual
A1 A2
Load
1L+
Output 2
1L–
System Manual
C79000-G8576-C199-06