Rockwell Automation 1771-OFE/B Analog Output Module User Manual - Manual (Page 73)

B-3
Publication 1771Ć6.5.30 - November 1998
The output module is capable of transferring up to 13 words in one
program scan. The number of words transferred is determined by the
block length entered in the output image table control byte.
The bits in the output image table control byte (Bits 00-05) must be
programmed to specify a binary value equal to the number of words
to be transferred.
For example, Figure B.2 shows if your output module is set up to
transfer five words, you would set Bits 00 and 02 of the lower output
image table control byte. The binary equivalent of five words, as
stated in the look-up table, is 000101.
Figure B.2
Setting Block Length
Data Address
Contains Module
Address in BCD
Output Image Table Control
Byte Contains Read
Enable Bit andBlock
Length in Binary Code
010
012
017
027
030
1 2 0
Data Table
1
R
Control
Byte
Read5 Words
from Module
Block Transfer
ReadEnable Bit
For Block
Transfer Active
Operations Only
Output Image Table
12995
1 0 0 0 0 1 0 1
Binary Bit Pattern
Lower Output Image Table Byte
05 04 03 02 01 00
0 0 0 0 0 0 Default
0 0 0 0 0 1 1
0 0 0 0 1 0 2
0 0 0 0 1 1 3
0 0 0 1 0 0 4
0 0 0 1 0 1 5
0 0 0 1 1 0 6
0 0 1 1 0 1 13
Number of
Words
to Transfer
Setting the Block Length
(Multiple GET Instructions
Only)