Rockwell Automation 1794-IJ2XT FLEX I/O Frequency Input Modules User Manual - Manual (Page 50)

Publication 1794-6.5.11 - September 2011
40 Read and Write Configuration Maps for the FLEX I/O Module
5 Frequency Scaling Divisor 0…255 Ch 1 Frequency Scaling Multiplier 0…255 Ch 1
6 WOFG
Ch 1 WOFF
Ch 1 IGI
Ch 1 IFI
Ch 1 Minimum Frequency
Sample Time Ch 1 Init
St Up
Ch 1 ACT Ch 1 F/A AS
Ch 1 MPDM
Ch 1 WOFM
Ch 1
Where: CF = Communication fault
SSM = Safe state mode
FR = Frequency Range
Ch = Channel
MPM = Missing Pulse Multiplier
R = Reserved
LF = Local fault mode
WOFF = Wire-off fault frequency WOFG = Wire-off fault gate
IGI = Invert gate input
IFI = Invert frequency input
ACT = Acceleration Calculation Time
F/AAS = Frequency/Accel alarm select
MPDM = Missing pulse delay multiplier
WOFM = Wire-off fault mode
Bit/Word Definitions for the Block Transfer Write Words
Word Bit Definition
Write Word 0 Bits 00…01 Missing pulse multiplier bits (channel 1) – used to modify the Minimum Frequency
Sampling Time to allow the frequency bandwidth to be more closely adjusted to the
value needed to report the proper frequency and report a missing pulse more quickly.
Default = No multiplier; alarm generated immediately
Bit 01 00 Missing Pulse Multiplier
0 0 No Multiplier, normal mode with 2 s delay
0 1 X2
1 0 X8
1 1 X32
Bits 02…04 Number of pulses to terminate sampling (channel 1) – Lets you calculate Frequency
when a specified number of input pulses have occurred. This allows earlier reporting of
the frequency than the Minimum Frequency Sampling Time, when many input pulses are
occurring. Accurate frequency determination is possible without waiting for the full
Minimum Frequency Sampling Time to expire.
Default = Minimum frequency sampling time
Bit 04 03 02 Number of pulses to terminate sampling
0 0 0 Use minimum frequency sampling time
0 0 1 2
0 1 0 4
0 1 1 8
1 0 0 16
1 0 1 32
1 1 0 64
1 1 1 128
Block Transfer Write Word Assignments
(Octal Bit) 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Dec. Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00