Rockwell Automation 1769-IF16V Compact High Density Analog Input Modules - Manual (Page 32)

32 Publication 1769-UM018A-EN-P - October 2008
Chapter 3 Module Data, Status, and Channel Configuration
Time Stamp Value (Word 16)
The modules support a 15-bit rolling timestamp that is updated during
each new update of the analog input values. The timestamp has a
1 ms resolution. If the timestamp function is enabled, the timestamp
value is placed in the Input Data file, word 16, following each module
conversion cycle. Enable and/or disable this timestamp in word 1, bit
15 of the Configuration Data file.
General Status Bits (S0…S15)
Word 17, bits 0…15 contain the general operational status bits for
input channels 0…15. If set (1), these bits indicate an alarm or range
error associated with that channel. The over- and under-range bits and
the high- and low-alarm bits for channels 0…15 are logically ORed to
the appropriate general status bit.
Low Alarm Flag Bits (L0 …L15)
Words 18…21, bits 3, 7, 11, and 15 contain the low alarm flag bits for
input channels 0…15. 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 (H0…H15)
Words 18…21, bits 2, 6, 10, and 14 contain the high alarm flag bits for
input channels 0…15. 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.