Allen-Bradley 1747-OC Series, User Manual

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1747-UM001A-US-P - March 2000
Introducing the Open Controller 1-5
Communicating with the Open
Controller Your CONTROLLER application software communicates with the
SCANNER to control I/O by reading and writing to the dual-port registers.
Your application can access the dual-port registers using:
•
the function calls in the open controller API (application program
interface) to access dual-port registers
Choose 1747-OCAPID for DOS or 1747-OCAPINT for Windows NT
•
a software package, such as SoftLogix 5 or Controlware, that have
built-in drivers that access the open controller dual-port registers
•
the drivers you develop
The dual-port documentation is available through the A-B technology
licensing program. For more information, contact Rockwell Automation
Technical Services.
Using the API software
The APIs (1747-OCAPID for DOS and 1747-OCAPINT for Windows NT)
provide libraries of C function calls for interfacing with the open controller
dual-port memory. Each library provides calls for typical control functions,
such as:
•
configure I/O files
•
initialize the SCANNER
•
define user LEDs, 3-position switch, 2-position jumper, and external
watchdog
•
read CONTROLLER status
•
read/write input/output data
•
enable/disable forces
The APIs support Microsoft and Borland C compilers in the DOS and
Windows NT environments. The DOS API is compiled as a 16-bit
MS-DOS library using the 80386 instruction set. The Windows NT API is a
standard 32-bit DLL.
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