Rockwell Automation 1771-N SERIES High Resolution Analog Module User Manual - Manual (Page 59)

4–19 Configuring the Module
Publication 1771ĆUM127B-EN-P - December 2002
The following six words configure the first input channel of the
module. These words are repeated as necessary for each input in the
module. For example, if this is a 2 output/6 input module, words 1
through 4 would configure the module, words 5 through 16 would
configure the 2 output channels (six words each). Then six groups of
seven words each (one group for each input channel) would
configure the module’s six input channels.
Input Programming
Word/Dec. Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Word/Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Channel 3 Programming
17 Low Scale Value
18 High Scale Value
19 Low Alarm Value
20 High Alarm Value
21
Alarm
enable
Rate Alarm: Scaled Units per second
22 Filter Time Constant: 0.1 second units Alarm Deadband
23 Thermocouple Type 0 RTD Type 10 Ohm Offset: 0.01 Ohm units
Bit/Word Description of Input Configuration Words 17 through 23
Word
Decimal Bit
(Octal Bit)
Definition
Word 17
Bits 00Ć15
(00Ć17)
Low scale value for channel 3.
Word 18
Bits 00Ć15
(00Ć17)
High scale value for channel 3.
Word 19
Bits 00Ć15
(00Ć17)
Low alarm value for channel 3.
Word 20
Bits 00Ć15
(00Ć17)
High alarm value for channel 3.
Word 21
Bits 00Ć14
(00Ć16)
Rate alarm. If the channel's input changes at a rate faster than this value and
the alarm enable bit is set, the channel will indicate a rate alarm condition.
Legal values are from 0.05 to 50% of full scale per second.
Bit 15 (17)
Alarm enable bit. If set to 1, the module will report high alarm, low alarm,
underrange, overrange, and rate alarm conditions. If 0, these warnings
are suppressed.
Word 22 Bits 00Ć07
Alarm deadband. This field creates a hysteresis effect on the low and high
alarms. For an alarm condition to be removed, the input signal must go above
the low alarm limit or below the high alarm limit by an amount equal to the
specified deadband. Alarm deadband values must be less than or equal to
one half the difference of the high and low alarm values.