
Publication 1746-UM004A-US-P
4-2
Programming Overview
Allocating 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 and the
module, refer to page 4-15 of this manual and to the
BASIC Language Reference
Manual
(publication number 1747-RM001A-US-P).
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 and above modular
controller 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
and higher processors and the module.
For more information on M0 and M1 files, refer to the
SLC 500™ and
MicroLogix™ 1000 Instruction Set Reference Manual
, publication number
1747-6.15.
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
Содержание 1746-BAS
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Страница 34: ...Publication 1764 UM001A US P 2 8 Component Selection...
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