Siemens S5-135U/155U appendix Analog Output Module Design, Module address

Analog Input/Output Modules

9.7The 470 Analog Output Module

9.7.1Design

The module is designed as a plug-in PCB for central controllers and expansion units with a backplane connector and with a blade connector to accept a plug-in front connector. You can directly connect the process signal lines to the front connector, which is available separately, with screw or crimp terminals.

Addressing	Situated on each module is an addressing switch with six rockers to set the
Switch, Mode	module address.
Switches	The modules are protected by covers on both sides.

Addressing Switch

Blade Connector

Front Connector

Figure 9-34 Analog Output Module

9.7.2Function of the Enable Input

The 470 module has an enable circuit. You can use the enable inputs to switch off individual modules whilst the PLC is in operation. This means that:

SThe module can no longer be addressed by the user program.

SOn analog output modules, the last analog value to be output is retained.

Modules which are switched off can be removed or inserted during operation. If this is not necessary, operate the module with the enable input switched off.

9-98	System Manual
	C79000-G8576-C199-06