Rockwell Automation 1794-IJ2XT FLEX I/O Frequency Input Modules User Manual - Manual (Page 47)

Publication 1794-6.5.11 - September 2011
Read and Write Configuration Maps for the FLEX I/O Module 37
4 R R Direction
Ch 0 GS
Ch 0 F/A
Ch 0 WO
Ch 0 MPA
Ch 0 R R Direction
Ch 1 GS
Ch 1 F/A
Ch 1 WO
Ch 1 MPA
Ch 1
5 Reserved Diagnostic Status
Where: R = Reserved
GS = Gate state
F/A = Frequency/Acceleration alarm
WO = Wire-off alarm
MPA = Missing pulse alarm
Block Transfer Read Word Assignments
(Octal Bit) 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Decimal Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Bit/Word Definitions for Block Transfer Read Words
Word Bit Definition
Read
Word 0 Bit 00…15
(00…17) Calculated value of frequency (channel 0) – frequency can be reported down to 1 or 1.0 Hz, depending on
the Frequency Range bit setting:
Below a 1 Hz value, 0 is reported
Below a 1.0 Hz value, 0.0 is reported.
Calculated frequency depends on Minimum Sampling Time and Missing Pulse Multiplier.
Word 1 Bit 00…15
(00…17) % of Full Scale or Acceleration (channel 0) – Value of the calculated frequency scaled by the Maximum
Frequency, or Calculated Value of Acceleration in Hz/s, depending on the state of the Frequency or
Acceleration Alarm Select bit.
Note: Percentage Full scale is calculated accurately up to a maximum of 3,276.7%. Beyond this maximum,
the value of 3,276.7% will be returned, and a Calculation Failure (9) will be set in the Diagnostic Status
byte.
Word 2 Bit 00…15
(00…17) Calculated value of Frequency (channel 1) – Frequency can be reported down to 1 or 1.0 Hz, depending on
the Frequency Range bit setting; below a 1 Hz value, 0 is reported; below a 1.0 Hz value, 0.0 is reported.
Calculated frequency depends on Minimum Sampling Time and Missing Pulse Multiplier.
Word 3 Bit 00…15
(00…17) Percentage of Full Scale or Acceleration (channel 1) – Value of the calculated Frequency scaled by the
Maximum Frequency, or Calculated Value of Acceleration in Hz/s, depending on the state of the Frequency
or Acceleration Alarm Select bit. Percentage full scale will be calculated accurately up to a maximum of
3,276.7%. Beyond this maximum, the value of 3,276.7% is returned, and a Calculation Failure (9) is set in
the Diagnostic Status byte.