Rockwell Automation 1746-BAS-T SLC 500 Basic Basic-T Modules - Manual (Page 50)

Publication 1746-UM004B-EN-P - December 2005
4-2 Programming Overview
Allocate SLC memory for
the Module Your SLC 500 fixed or modular controller communicates to the
module through the SLC backplane interface. The backplane interface
transfers data from the CPU input and output image tables to the
module input and output buffers as shown in Figure 4.1.
For more information regarding the transfer of data between the SLC
controller and the module, refer to page 4-16 of this manual and to
the BASIC Language Reference Manual, publication 1747-RM001.
Figure 4.1 SLC 500 to Module Data Transfer
(1)
Word 200 is predefined. You cannot write to word 200 of the BASIC output buffer.
In addition to transferring image table data, the SLC 5/02 controller
and above modular processor may transfer an additional 64 words of
input or output data to the module. Figure 4.2 shows the transfer of
M0 and M1 files between the SLC 5/02 processor, and higher, and the
module.
For more information on M0 and M1 files, refer to the SLC 500
Instruction Set Reference Manual, publication 1747-RM001.
Word 0
Word 1
Word 2
Word 3
Word 4
Word 5
Word 6
Word 7
Word 200
Word 201
Word 202
Word 203
Word 204
Word 205
Word 206
Word 207
Word 0
Word 1
Word 2
Word 3
Word 4
Word 5
Word 6
Word 7
Word 200 (1)
Word 201
Word 202
Word 203
Word 204
Word 205
Word 206
Word 207
CPU Output
Image Table
BASIC or
BASIC-T
Module Input
Buffer
CPU Input
Image Table
BASIC or
BASIC-T
Module Output
Buffer