Rockwell-automation T8403 Trusted 24V dc Digital input Module - 40 Cha Manual de usuario descargar pdf (Pagina 25)

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Module T8403

Issue 15 Jun 13 PD-T8403 25

4.3. I/O Status LEDs

There are 40 input channel status LEDs on the module front panel, one for each field input. These

indicators are controlled by the FPU. The FPU receives data from each of the module slices. The

FPU performs a 2-oo-3 vote on each data bit from the slices and sets the indicators accordingly.

The input status LED mode is dependent upon the voltage level of the field I/O signal. Each field input

voltage is measured and compared to six threshold levels (four configurable and two fixed) which

produce seven threshold bands. Each threshold band can be defined to have a particular indicator

mode: off, green, red, flashing green, or flashing red.

The configurable voltage thresholds and LED modes allow users to customise the input measurement

and status indications to suit individual application requirements. Without customisation, the default

indicator modes are suitable for digital inputs without line monitoring as described below:

Indicator State Description

Off Open field switch (contact) or open circuit or indeterminate

between open and closed (states 1,2,3).

Green Closed field contact (contact) or short circuit (states 4,5).

Red – flashing Channel Fault (state 7).

Table 17 Default I/O status Indicators

Note: The LEDs indicating channel status may be configured to suit user requirements by

implementing the procedure for configuring the System.INI file detailed in PD-8082B.

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Rockwell-automation T8403 Trusted 24V dc Digital input Module - 40 Cha Manual de usuario Pagina 25