Rockwell Automation 1747-DSN DISTRIBUTED I/O SCANNER - Manual (Page 23)

Input File
Control Word, Word 0 O:e.0
O:e.1
O:e.6
O:e.7
I/O block 1 Output, Word 1
I/O block 6 Output Word 6
I/O block 7 Output, Word 7
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Bit Number (decimal)
e = slot number of the SLC rack containing the scanner
Bits 6 and 7are only
available to I/O
blocks
with 8 outputs
Configuration
Data Valid
Disable
Outputs
Number of
I/O blocks
Reserved
The output word for each I/O block is placed in the word
corresponding to the I/O block address. The bits of each
output word correspond to the outputs on the I/O block.
For example, bit 5 of output word 7 controls output 5 of
I/O block 7.
Control Word Configuration Information
1
1
2
2
00000 configures the scanner for 7 I/O blocks
Scanner detects rising edge
Output bits
Chapter 3
Configuration and Programming
3–5
Configuration Data Valid Bit – Bit 10 of the Control Word (word 0) must
be set after bits 0 – 4 (Number of I/O blocks) are valid. When this bit is first
set to 1 (from within the run mode), bits 0 – 4 (Number of I/O blocks) are
used to configure the scanner with the number of I/O blocks connected.
Important: This bit should not be reset to 0 during program execution.
Once this bit is set, further transitions of bits 0 – 4 (Number of
I/O blocks) are ignored.
7 I/O block Configuration Output Image Example
Configurable Item Values Result
Number of I/O Blocks 00001 to 00111 1 – 7 I/O blocks
Disable Outputs
0
1 Outputs enabled
Outputs disabled
Configuration Data Valid
0
1 Invalid
Valid