Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 181)

17Ć1
17.0 EXCHANGING DATA WITH
AN AutoMax PC3000 OVER
THE ISA BUS
You can use the ISA bus to exchange data between an internal
PC3000 and the PC's microprocessor. This section provides a brief
explanation of these registers.
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For this information:
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See section:
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About the Register Organization of the AutoMax PC3000
Application Interface
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17.1
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Using the Volatile Variables
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17.2
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Using the NonĆVolatile Variables
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17.3
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Using the System Information Variables
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17.4
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What to Do Next ББББББ
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17.5
17.1 About the Register Organization of the
AutoMax PC3000 Application Interface
The PC3000 Application Interface contains registers you can use to
exchange information over the ISA backplane between applications
running on the PC3000 and applications running on the PC's
microprocessor. The Application Interface contains both volatile and
nonĆvolatile registers. You can attach a variable to a whole register
or to individual bits within a register.
When creating programs that use variables in these registers, keep
in mind the addressing differences that exist between the AutoMax
PC3000 and the Intel  microprocessor in a PC. Real variables in the
AutoMax PC3000 are in the Motorola  format. You can use the
BASIC function CONVERT% to convert them into the Intel or IEEE
format. See the AutoMax Enhanced BASIC Language instruction
manual, JĆ3675, for more information.
17.2 Using the Volatile Variables
Use registers 0Ć999 of the PC3000 Application Interface to store
volatile data. Variables do not retain their value through power
cycles and Stop All conditions.
17.3 Using the NonĆVolatile Variables
Use registers 1000Ć1999 of the PC3000 Application Interface to store
nonĆvolatile data. Variables retain their value through Stop All
conditions and power cycles.