Siemens S5-135U/155U Analog Input Module Design, Function of the Enable Input, Switch, Mode

Analog Input/Output Modules

9.3The 460 Analog Input Module

9.3.1Design

The modules are designed as plug-in PCBs 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. Analog input modules also have two switches on the side
Switches	with eight rockers for setting the mode, and receptacles for range cards.

The modules are protected by covers on both sides.

Addressing Switch

Blade Connector

Front Connector

Mode Switches

Range Cards

Figure 9-1 Analog Input Module

9.3.2Function of the Enable Input

The 460 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.

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.

9-4	System Manual
	C79000-G8576-C199-06