Rockwell Automation 1794-OB16D FLEX I/O Diagnostic Modules User Manual - Manual (Page 28)

Publication 1794-UM061A-EN-P - July 2006
26 About the FLEX I/O Diagnostic Input Module
Configure Your Diagnostic
Input Module
The configuration and input filter selection table are shown below.
Data Table & Input Filter Time Selection
The inputs are read in Word 1. Bit 00 is the first input and decimal bit 15 is the
last input.
Diagnostic status is read from Word 2:
Bit 00: Module Error Bit
Bit 01: External Power Reverse Polarity Error Bit
Bit 02: Sensor Power Short Error Bit
Bit 03: Sensor Power Open Wire Error Bit
Input Filter Times
Input filter times are configurable on a module basis. Both off-to-on and
on-to-off times are set by write Word 3. The default filter time is 0.25 ms.
Dec. 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Oct. 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Read 1 I 15 I 14 I 13 I 12 I 11 I 10 I 9 I 8 I 7 I 6 I 5 I 4 I 3 I 2 I 1 I 0
Read 2 Not used Read Diagnostics Status
Write 1 Not used Input Filter FT 0-15 Not used
Where: I = Input
FT = Input filter time
Diagnostic status;
Bit 00 = module error;
Bit 01 = external power reverse polarity error;
Bit 02 = sensor power short error;
Bit 03 = sensor power open wire error
Bits Description Filter Time
10 09 08 Filter time for inputs 0
thru 15
Off-to-On/
On-to-Off
0 0 0 Filter time 0 (default) 0.25 ms
0 0 1 Filter time 1 0.5 ms
0 1 0 Filter time 2 1 ms
0 1 1 Filter time 3 2 ms
1 0 0 Filter time 4 4 ms
1 0 1 Filter time 5 8 ms
1 1 0 Filter time 6 16 ms
1 1 1 Filter time 7 32 ms