Rockwell-automation 1769-IF4XOF2 Compact 8-Bit Low Resolution Analog I Bedienungsanleitung PDF herunterladen (Seite 48)

Publication 1769-UM008A-EN-P - November 2001

4-4 1769-IF4XOF2 Module Data, Status, and Configuration Channels

Input Data Words 0 through 3

All bits shown as 0 (bits 0 through 6) are always set to 0. Bits 7

through 14 contain the 8 input data bits. The table below illustrates

the format of the input data, words 0 to 3.

Input Data Words 4 through 7

These words contain diagnostic and control information. For details

see Bit Definitions for Input Data below.

Bit Definitions for Input Data

Sign Bit (SGN)

The sign bit is always positive (equal to zero).

Over Input Range Flag Bits (I0 to I3)

Word 4, bits 0 to 3 (i0 to I3) contain over-range flag bits for input

channels 0 through 3 respectively. These bits can be used in the

control program for error detection. When set to 1, the bits signal that

the input signal is outside the normal operating range. However, the

module continues to convert analog data to the maximum full-range

value. When the over-range condition is cleared, the bits automatically

reset to (0).

Over Output Range Flag Bits (O0 and O1)

Word 5, bits 0 and 1 (O0 and O1) provide over-range indication for

output channels 0 and 1. These bits can be used in the control

program for error detection. When set to 1, the bits signal that the

output signal is outside the normal operating range. However, the

module continues to convert analog data to the maximum full-range

value. When the over-range condition is cleared, the bits automatically

reset to 0.

1514131211109876543210

SGNA7A6A5A4A3A2A1A00000000

TIP

Under-range indication is not provided for the

1769-IF4OXF2 because zero is a valid number.

Refer to Table 4.9 Valid Input Data on page 4-14 to

view the normal operating and over-range areas.

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 103 104

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Rockwell-automation 1769-IF4XOF2 Compact 8-Bit Low Resolution Analog I Bedienungsanleitung Seite 48