Siemens S5-135U/155U - Manual (Page 480)

9-98
System Manual
C79000-G8576-C199-06
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.
Situated on each module is an addressing switch with six rockers to set the
module address.
The modules are protected by covers on both sides.
Blade Connector
Addressing Switch
Front Connector
Figure 9-34 Analog Output Module
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:
S
The module can no longer be addressed by the user program.
S
On 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.
Addressing
Switch, Mode
Switches
Analog Input/Output Modules