Rockwell Automation 1771-IFE , D17716.5.90 USER MNL. ANALOG INPUT Module - Manual (Page 38)

Module Configuration
Chapter 4
4-9
Bit/Word Descriptions for the Analog Input Module Block Transfer
Write Configuration Block
Note that decimal bits are shown, with octal bits in parentheses.
Word
Decimal Bit
(Octal Bit)
Description
Word 1 and 2
Bits 00Ć15
(00Ć17)
Input range selections allow the user to configure the inputs for any of 7 input
voltage or current ranges. Two bits are required for each channel. See Table 4.A.
Word 3
Bits 00Ć07
(00Ć07)
Digital filter reduces effect of noise on input. See "Digital Filtering" on page 4Ć4.
Bit 08
(10)
Input type, set bit for differential mode on all channels.
Reset (0) = singleĆended. Refer to Table 4.C
Bits 09Ć10
(07Ć10)
Data format matches format of processor. See Table 4.D.
Bits 11Ć15
(13Ć17)
Real time sampling will default to 12.5ms for differential mode and 25ms for
singleĆended, greater with filtering selected. See appendix A for timing details.
See Table 4.E for other real time intervals.
Word 4
Bits 00Ć15
(00Ć17)
Minimum sign bits, when set, designate negative minimum scaling values for the
corresponding input channels. Bit 00 corresponds to channel 1, bit 01
corresponds to channel 2, etc.
Word 5
Bits 00Ć15
(00Ć17)
Maximum sign bits, when set, designate maximum scaling values that are
negative. Maximum scaling value must be greater than minimum on any
particular channel. Bit 00 corresponds to channel 1, bit 01 corresponds to
channel 2, etc.
Words 6Ć37
Bits 00Ć15
(00Ć17)
Minimum and maximum scaling values for each channel. Enter in BCD format.
In this chapter you learned how to configure your module’s features,
condition your inputs and enter your data.
Chapter Summary