Commissioning Notes - Siemens TALON Series Technical Reference Manual

Commissioning Notes

I/O Module Power-up Sequence
Siemens Industry, Inc.
588-587
WARNING
Do not use the local override for safety shutdown operations, such as performing
service or maintenance. Use suitable emergency switches instead.
Removing and inserting modules without disconnecting the power
The plug-in modules can be removed from or plugged into the terminal bases without
switching off the power. However, if large loads are connected to the terminals, it is
possible that the contacts between the terminal base and plug-in module could be
burnt.
Emergency operation via override
In the event of a bus communications failure, emergency manual operation is possible
in I/O modules with local override switches. However, the 24 Vdc module supply must
be present.
Power Off Status
TX-I/O modules shut down when the power supply to the module is below 16 V.
The LEDs and LCDs are off.

The modules are inactive.

Power Up Sequence
The modules start up when the power supply to the module rises above 21.5V.
1. The module status LED lights up and the LCD briefly displays the address number.
2. The status LED indicates the last operating state before the module shut down.
If communication is OK:
The TX-I/O module begins operation with the configured values.

If there's no communication:
The module waits 4 seconds for communication.

There's no control of outputs during this time.

If there's no communication after 4 seconds:
The TX-I/O module begins operation with the backup values.

CONFIDENTIAL: For internal use only
TALON TX-I/O Modules and Island Bus Technical Reference
TX-I/O Island Bus
45
4/6/2010