Rockwell-automation 1771-IFE ANALOG INPUT MODULE Manual de usuario descargar pdf (Pagina 34)

4–2 Configuring Your Module

)! ( $# +  &)&* 

During normal operation the processor transfers 1 to 39 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-IFE/C will respond with the 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 (Table 4.A).

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.

Table 4.A Input Range Selection Bits

Bit 01 Bit 00 Voltage or current input

   ($    ($ "



   ($    ($ "



  + ($   + ($ "



  + ($  



  ($  



)&&#( #%)( "$ '!( * $# )&( $# %!)



$# )&! )' #  +%$!& '! #

Dec. Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Description

Octal Bits 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Description

& ( $&          # !( $# + ##!'  (&) 

& ( $&          # !( $# + ##!'  (&) 

Table 4.B 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.

Input Range Selection

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 81 82

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Rockwell-automation 1771-IFE ANALOG INPUT MODULE Manual de usuario Pagina 34