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Communication Access Registers
36
870 USE 103 00 May 2001
Overview of Register Types
Purpose Each adapter contains three groups of internal registers that enable the application
program to communicate with the I/O base module.
This section describes the three register types, their functions and how they are
accessed.
Register Types The three types of internal registers are:
Data registers
Configuration registers
Status registers
Functions The application can access the registers through the network to transfer input or
output data at the module’s field terminals, to set or retrieve the module’s
configuration, or to monitor its status.
Access to
Registers
The registers are accessed as 4XXXX references in a controller’s application
program. Note that the Data Registers are the only ones that can be accessed by
the controller’s Peer Cop table. All of the registers can be accessed by MSTR
function blocks.