Rockwell Automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Module - Manual (Page 37)

Publication 1769-UM019A-EN-P - October 2008 37
Module Data, Status, and Channel Configuration Chapter 3
Low Alarm Flag Bits (LI0 …LI3)
Word 6, bits 3, 7, 11, and 15 contain the low alarm flag bits for input
channels 0…3. If set (1), these bits indicate the input signal is outside
the user-defined range. The module continues to convert analog data
to minimum full-range values. The bit is automatically reset (0) when
the low alarm condition clears, unless the channel’s alarm bits are
latched. If the channel’s alarm bits are latched, a set (1) low alarm flag
bit clears via the corresponding Cancel Low Process Alarm Latch bit in
your output data file.
High Alarm Flag Bits (HI0…HI3)
Word 6, bits 2, 6, 10, and 14 contain the high alarm flag bits for input
channels 0…3. If set (1), the input signal is outside the user-defined
range. The module continues to convert analog data to maximum
full-range values. The bit is automatically reset (0) when the high
alarm condition clears, unless the channel’s alarm bits are latched. If
the channel’s alarm bits are latched, a set (1) high alarm flag bit clears
via the corresponding Cancel High Process Alarm Latch bit in your
output data file.
Over-range Flag Bits (OI0…OI3)
Over-range bits for channels 0…3 are contained in Word 6, bits 0, 4, 8,
and 12. When set (1), this bit indicates an input signal is beyond the
normal operating range. However, the module continues to convert
analog data to the maximum full-range value. The bit is automatically
reset (0) by the module when the over-range condition is cleared and
the data value is within the normal operating range.
Under-range Flag Bits (UI0…UI13)
Under-range bits for channels 0…3 are contained in Word 6, bits 1, 5,
9, and 13. When set (1), this bit indicates an input signal is below the
normal operating range. However, the module continues to convert
analog data to the minimum full-range value. The bit is automatically
reset (0) by the module when the under-range condition is cleared
and the data value is within the normal operating range.