Rockwell Automation 57C442 Data Highway Plus Interface Module - Manual (Page 24)

4-6
Register 4352 is a Read/Write register from Multibus. To transmit global
data, you must set bit 8 in the Data Highway Plus options register
(register 7) before you go on-line. The module will then pass the value
in register 4352 when it passes the token.
4.2 AutoMax Application Programming
The sections that follow describe how to configure registers in the Data
Highway Plus Interface module’s dual port memory and how to initiate
commands from the module. Link configuration and application
programming examples are provided.
4.2.1 Variable Configuration
AutoMax application tasks communicate with the Data Highway Plus
Interface module by referencing registers in the dual port memory.
These registers must first be configured using the AutoMax
Programming Executive software. In AutoMax Programming Executive
Version 3.0 and later, you define these registers using the Variable
Configurator. Specific screens are available for each module. If you are
using AutoMax Programming Executive Version 2.1 or earlier, you
define these registers using IODEF statements in the rack configuration
task. Note that ABDEF statements cannot be used with the Data
Highway Plus Interface Module.