204 Rockwell Automation Publication 1769-UM021G-EN-P - October 2015
Chapter 8 Use I/O Modules with CompactLogix 5370 L2 Controllers
Embedded Analog I/O
Modules Data Arrays
The section describes the data table structures for the embedded analog I/O
modules on the CompactLogix 5370 L2 controllers. The embedded analog I/O
modules have arrays for the following data:
• Input data
• Output data
• Configuration data
You can access the data via the tags in the application.
Input Array
The input data array for the embedded analog I/O module contains 11 words as
described in Tab le 16
. This array is read-only and the default value for all bits is 0.
The analog I/O modules data structures apply to only the 1769-L24ER-QBFC1B
and 1769-L27ERM-QBFC1B controllers.
The 1769-L24ER-QB1B controller does not have an embedded analog
I/O module.
Table 16 - CompactLogix 5370 L2 Controller Embedded Analog I/O Module Input Data Array
Word
Bit
1514131211109876543210
0 S Analog Read (Input) Data Value Channel 0
1 S Analog Read (Input) Data Value Channel 1
2 S Analog Read (Input) Data Value Channel 2
3 S Analog Read (Input) Data Value Channel 3
4 Nu Timestamp Value
5 Nu UI4 OI4 OC4 OC3 OC2 OC1 OC0 Nu SI4 SI3 SI2 SI1 SI0
6 LI3 HI3 UI3 OI3 LI2 HI2 UI2 OI2 LI1 HI1 UI1 OI1 LI0 HI0 UI0 OI0
7 S Cold Junction Compensation Value
8 S Output Data Loopback/Echo Channel 0
9 S Output Data Loopback/Echo Channel 1
10 Nu UO1 OO1 Nu UO0 OO0 Nu SO1 SO0
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