Rockwell-automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Manual de usuario descargar pdf (Pagina 36)

36 Publication 1769-UM019A-EN-P - October 2008

Chapter 3 Module Data, Status, and Channel Configuration

Input Data File

The input data table lets you access analog input-module read data for

use in the control program, via word and bit access. The data table

structure is shown in the table below. For each input module, slot x,

words 0…3 in the input data file contain the converted values of the

analog inputs. The most significant bit (MSB) is the sign bit, which is

in two’s complement format. ‘Nu’ indicates not used with the bit set to

zero.

Time Stamp Value (Word 4)

The module supports a 15-bit rolling time stamp that is updated

during each new update of the analog input and output values. The

time stamp has a 1 ms resolution. If the time stamp function is

enabled, the time stamp value is placed in the Input Data file, word

16, following each module conversion cycle. Enable and/or disable

this time stamp in word 1, bit 15 of the Configuration Data file.

General Input Status Bits (SI0…SI3)

Word 5, bits 0…3 contain the general operational status bits for input

channels 0…3. If set (1), these bits indicate an alarm or range error

associated with that channel. The over- and under-range bits and the

high- and low-alarm bits for channels 0…3 are logically ORed to the

appropriate general status bit.

Input Data Array

Word/

Bit

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Word 0 SGN Analog Read (Input) Data Value Channel 0

Word 1 SGN Analog Read (Input) Data Value Channel 1

Word 2 SGN Analog Read (Input) Data Value Channel 2

Word 3 SGN Analog Read (Input) Data Value Channel 3

Word 4 0 Time Stamp Value

Word 5 Nu NuNuNuNuNuNuNuNuNuNuNuSI3SI2SI1SI0

Word 6 LI3 HI3 UI3 OI3 LI2 HI2 UI2 OI2 LI1 HI1 UI1 OI1 LI1 HI1 UI1 OI1

Word 7 Nu NuUO1OO1NuNuUO0OO0NuNuNuNuNuNuSO1SO0

Word 8 SGN Output Data Loopback/Echo Channel 0 0 0

Word 9 SGN Output Data Loopback/Echo Channel 1 0 0

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 93 94

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Rockwell-automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Manual de usuario Pagina 36