Siemens S5-135U/155U appendix Design, LED Indicators Addressing Switch

Models: S5-135U/155U

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Digital Input/Output Modules

8.1.1Design

LED Indicators

Addressing Switch

The modules are designed as plug-in PCBs for central controllers and expansion units with backplane connector and with a blade connector to accept a plug-in front connector. The front connector has screw or crimp terminals and is available separately; you can connect the process signal lines to it directly.

Fitted to each module is a strip with green LEDs to indicate the logic states of inputs or outputs. The LEDs are arranged in bytes and marked bit 0 to 7.

Output modules for direct voltage additionally have red LEDs to indicate short-circuits between output lines and ground (L-) within a group. Output modules for alternating voltage have red LEDs to indicate a fuse failure.

Fitted on each module is an addressing switch with six, seven or eight rockers to set the module address.

The modules are protected on both sides by covers.

Addressing Switch

Blade Connector

Front Connector

LEDs

Figure 8-1 Digital Input Module

8-4

System Manual

C79000-G8576-C199-06

Page 316
Image 316
Siemens S5-135U/155U appendix Design, LED Indicators Addressing Switch