The 470 Analog Output Module; Design; Function Of The Enable Input - Siemens S5-135U/155U System Manual

Analog Input/Output Modules
9.7

The 470 Analog Output Module

9.7.1

Design

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.
Figure 9-34
9.7.2

Function 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:
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
Blade Connector
Front Connector
Analog Output Module
The module can no longer be addressed by the user program.
On analog output modules, the last analog value to be output is retained.
Addressing Switch
System Manual
C79000-G8576-C199-06