Siemens S5-135U/155U appendix Acknowledge, Enable Input and Enable Jumper

Models: S5-135U/155U

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Analog Input/Output Modules

Enable Input

The enable circuit requires an external 24 V voltage at enable inputs F+/F- in

 

the front connector. If there is no voltage at F+/F-, the modules will not

 

acknowledge.

When the front connector is swivelled away from the front strip of the module, the supply of power to the enable input is interrupted, i.e. the module is switched off and can no longer be addressed by the user program: a timeout (QVZ) occurs in the CC.

Switching Off the The 460 module additionally offers the facility for changing the enable

Enable Inputmode. The module has a jumper accessible from above in the vicinity of the addressing switch.

When the enable jumper is inserted, you can define the behaviour of the 460 analog input module as follows:

SWhen the enable voltage and load voltage are obtained from the same load supply, a shutdown of the 24 V load voltage will result in a timeout.

SWhen the enable voltage and load voltage are obtained from different load supplies, a shutdown of the 24 V load voltage will not result in a timeout. (With the 460-4UA11/12 modules, a shutdown of the load voltage will result in a timeout.)

Enable Jumper

Figure 9-2 Enable Input and Enable Jumper

Jumper inserted:

Enable input (F+/F-) active (factory setting)

Jumper open:

Enable input (F+/F-) switched off

Examples of functioning of the enable inputs:

STo switch off individual subprocesses, i.e. outputs of various modules can be operated from a common load supply and yet activated separately.

SThe load voltage of individual modules can be monitored without additional circuitry. Any reactions to failure of the load voltage can be programmed in the QVZ (timeout) organization block.

System Manual

9-5

C79000-G8576-C199-06

Page 387
Image 387
Siemens S5-135U/155U appendix Acknowledge, Enable Input and Enable Jumper