Siemens S5-135U/155U - Manual (Page 334)

8-22
System Manual
C79000-G8576-C199-06
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.
Outputs of modules with the same load voltage supply may be connected in
parallel without additional circuitry.
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 2
2L–
Load
Manual
A1 A2
1L+
1L–
Output 1
Figure 8-10 Parallel Connection of Outputs for DC Voltage Outputs
Outputs can be connected in parallel without increasing the load if they are
connected to the same phase (L) and the same neutral conductor (N).
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.
Digital Output
Modules for DC
Voltage
Digital Output
Modules for AC
Voltage
Digital Input/Output Modules