Rockwell Automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Module - Manual (Page 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 Nu Nu Nu Nu Nu Nu Nu Nu Nu Nu Nu SI3 SI2 SI1 SI0
Word 6 LI3 HI3 UI3 OI3 LI2 HI2 UI2 OI2 LI1 HI1 UI1 OI1 LI1 HI1 UI1 OI1
Word 7 Nu Nu UO1 OO1 Nu Nu UO0 OO0 Nu Nu Nu Nu Nu Nu SO1 SO0
Word 8 SGN Output Data Loopback/Echo Channel 0 0 0
Word 9 SGN Output Data Loopback/Echo Channel 1 0 0