Publication 1747-UM006B-EN-P - June 2003
Addressing 3-13
How I/O Module Images
Are Mapped
The method of transferring an I/O module's image to the 1747-ASB
module's image is referred to as image mapping, or mapping. An I/O
image can be discretely mapped or block transfer mapped. How the
module's image is mapped depends on the type of module you are
using (discrete or specialty I/O).
The following table lists all of the different types of I/O modules
currently supported by the 1747-ASB module.
How Discrete I/O Modules Are Mapped
Discrete I/O images are exchanged with either the SLC or PLC scanner
using RIO discrete transfers. Discrete I/O module images are always
discretely mapped to the 1747-ASB module image. Discrete I/O
images are mapped into the assigned image space beginning with the
least significant bit. The example below assumes 1-slot addressing
starting at logical group zero.
I/O Module Type of Module
4-point discrete I/O Discrete
8-point discrete I/O Discrete
16-point discrete I/O Discrete
32-point discrete I/O Discrete
Combination discrete I/O Discrete
Analog I/O Specialty
BASIC Module Specialty
IMC 110 Servo Motion Control Module Specialty
Distributed I/O Scanner Module Specialty
Direct Communications Module Specialty
KE Communications Module Specialty
Thermocouple/mV Module Specialty
RTD/Resistance Module Specialty
Stepper Controller Module Specialty
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