
)! ( $# + )#
During normal operation the processor transfers 1 to 41 words to the
module when you program a block transfer write instruction to the
module’s address. This BTW file contains configuration words, and
calibration words (words 38 and 39) for each channel.
When a block transfer transfer length of 0 is programmed, the
1771-IFF/A will respond with the 1771-IFE series A default length
of 37.
You can configure the module to operate with any of five voltage or
three current ranges. You select individual channel ranges using the
designated words of the block transfer write instruction (below). Use
BTW word 1 for range selection of channels 1 through 8, and BTW
word 2 for channels 9 through 16. Two bits are allocated for each
channel.
!
! !
($ ($ "
($ ($ "
+ ($ + ($ "
+ ($
($
)&&#( #%)( "$ '!( * $# )&( $# %!)
$# )&! )' # +%$!& '! #
& ( $& # !( $# + ##!' (&)
& ( $& # !( $# + ##!' (&)
The following table shows the incremented voltage or current
assigned to each bit for the seven different input ranges. For
example, if the channel 1 input range is 0 to +5V and the actual
incoming signal is at mid-range (+2.5V) the value in the module’s
data word would be 0000 1000 0000 0000 (binary) or 2048
(decimal). The input is 2048/4096, or 1/2 of full scale.
!
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