Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 52)

Publication 1746-UM008B-EN-P - December 2006
52 Preliminary Operating Considerations
Module Addressing The memory map displays how the output and input image tables are
defined for the RTD module.
Output Image - Configuration Words
The 8-word, RTD module output image (defined as the output from
the CPU to the RTD module) contains information that you configure
to define the way a specific channel on the RTD module will work.
These words take the place of configuration DIP switches on the
module. Although the RTD output image is eight words long, only
output words 0…3 are used to define the operation of the module;
output words 4…7 are used for special user-set scaling using the
proportional counts data format. Each output word 0…3 configures a
single channel.
Channel 0 Configuration Word
Channel 1 Configuration Word
Channel 2 Configuration Word
Channel 3 Configuration Word
Channel 0 Data Word
Channel 1 Data Word
Channel 2 Data Word
Channel 3 Data Word
Channel 0 Status Word
Channel 1 Status Word
Channel 2 Status Word
Channel 3 Status Word
Output Image
8 Words
Input Image
8 Words
Output Image
Input Image
Output
Scan
Input
Scan
Output Image
Input Image
Slot e
Slot e
SLC 5/0X
Data Files
RTD Module
Image Table
Bit 15 Bit 0
Bit 15 Bit 0
Word 0
Word 1
Word 2
Word 3
Word 7
Word 0
Word 1
Word 2
Word 3
Word 4
Word 5
Word 6
Word 7
Address
Address
O:e.0
O:e.1
O:e.2
O:e.3
O:e.7
I:e.0
I:e.1
I:e.2
I:e.3
I:e.4
I:e.5
I:e.6
I:e.7
(Class 1)
Word 4 O:e.4
Word 5 O:e.5
Word 6 O:e.6
User-set Lower Scale Limit Range 0
User-set Upper Scale Limit Range 0
User-set Lower Scale Limit Range 1
User-set Upper Scale Limit Range 1