Module Addressing; Output Image - Configuration Words - Allen-Bradley SLC 500 1746-NR4 User Manual

Chapter 4
Preliminary Operating Considerations

Module Addressing

SLC 5/0X
Data Files
Slot e
Output Image
Slot e
Input Image
4–2
The memory map shown in Figure 4.1 displays how the output and input
image tables are defined for the RTD module.
Figure 4.1
Memory Map
RTD Module
Image Table
Output
Scan
Output Image
8 Words
Input
Scan
Input Image
8 Words
(Class 1)
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.
Example – If you want to configure channel 2 on the RTD module located in
slot 4 in the SLC chassis, your address would be O:4.2.
AB Spares
Chapter 5, Channel Configuration, Data, and Status, gives you detailed bit
information about the data content of the configuration word.
Bit 15
Channel 0 Configuration Word
Channel 1 Configuration Word
Channel 2 Configuration Word
Channel 3 Configuration Word
User–set Lower Scale Limit Range 0
Output Image
User–set Upper Scale Limit Range 0
User–set Lower Scale Limit Range 1
User–set Upper Scale Limit Range 1
Channel 0 Data Word
Channel 1 Data Word
Input Image Channel 2 Data Word
Channel 3 Data Word
Channel 0 Status Word
Channel 1 Status Word
Channel 2 Status Word
Channel 3 Status Word
Bit 15
Slot
File Type
Word
O : 4 . 2
Word
Element
Delimiter
Delimiter
Bit 0 Address
O:e.0
Word 0
Word 1
O:e.1
O:e.2
Word 2
Word 3 O:e.3
Word 4
O:e.4
Word 5
O:e.5
Word 6
O:e.6
Word 7
O:e.7
Address
Word 0
I:e.0
Word 1
I:e.1
Word 2 I:e.2
Word 3 I:e.3
Word 4 I:e.4
Word 5 I:e.5
Word 6
I:e.6
Word 7
I:e.7
Bit 0