Siemens S5-135U/155U Digital Output Modules for DC Voltage, Modules for AC, Must not be exceeded

Digital Input/Output Modules

8.2.5Connection of Outputs in Parallel and Switching On the Load via a Contact

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Digital Output Modules for DC Voltage

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+.

		Manual
2L+	A1	A2	1L+
Output 1			Output 2
2L±			1L±
		Load

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	System Manual
	C79000-G8576-C199-06