Rockwell-automation 1797-OE8H FLEX Ex HART Analog Modules User Manual Manual de usuario descargar pdf (Pagina 39)

Publication 1797-6.5.3 - March 2006

Understand Configurable FLEX Ex Analog Module Features 2-9

Digital Fault State

The Digital Fault State feature determines how your I/O module reacts to

faults when a channel is used in digital mode. After a fault condition occurs,

the module may reset channel outputs or hold last state of the outputs.

Use your programming software to set the Digital Fault State bit to 0 to reset

outputs. Set to 1 to hold last state of the outputs after a fault occurs. This

feature is available on a per channel basis.

Data Format

You must choose a module data format in your user program. See

1797-OE8H Data Formats on page 2-10 for an explanation of each bit. Data

Formats 2, 5, 6, 8, 9, 10, 12 and 15 are not assigned.

When choosing a data format, remember the following:

• If a non-assigned Analog Data Format is selected, the module sets

Diagnostic Data to 2 for configuration failure and puts affected

channels affected in the corresponding fault state.

• An unconfigured module channel pair can be assumed to have the

default configuration Analog Data Format 0, 0 to 20 mA and Analog

Mode Fault State minimum range. If a non-assigned format is selected,

then the diagnostic 2 for configuration failure is set and the module

channel pair goes to the default fault state minimum range.

• If the configuration had been changed, from the default, and then it was

changed again to a non-assigned format, then the diagnostic bit 2 for

configuration failure is set and the module goes to the fault state for the

last valid configuration.

• Formats 13 and 14 are 2’s complement data formats, and require data to

the module in that form.

• Range: 0 to 15

• Default: 0

• Data Table Reference: data format, word 12 and 13, bits 0 to 3, bits 4 to

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 195 196

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Rockwell-automation 1797-OE8H FLEX Ex HART Analog Modules User Manual Manual de usuario Pagina 39