Rockwell Automation 1794-IJ2XT FLEX I/O Frequency Input Modules User Manual - Manual (Page 56)

Publication 1794-6.5.11 - September 2011
46 Read and Write Configuration Maps for the FLEX I/O Module
Word 6 Bits 00…01 Wire-Off/Missing Pulse fault select (channel 1) – Sets the mode for 24V DC IEC 1+ Wire
Off Input Detection and Missing Pulse Detection result for any input (Frequency or Gate).
The Maximum Frequency is determined by Frequency Range bit and the Maximum
Frequency value, and the Minimum Frequency is determined by Frequency Range bit.
The Wire Off detect time (in mode 1, 2, and 3) is 2 seconds maximum.
Bit 01 00 Channel wire-off or missing pulse fault mode
0 0 Disabled
0 1 Alarm only (frequency unchanged)
1 0 Alarm and force frequency to maximum frequency value (32767 or
3276.7 or maximum frequency value, 0).
1 1 Alarm and force frequency to minimum frequency value (0 or 0.0).
Bits 02…03 Missing pulse delay multiplier bits (channel 1) – Specifies the number of Missing Pulse
Alarms periods (Minimum Frequency Sampling Times) which will be tolerated before the
alarm is actually generated, if enabled. (Used to defeat the Missing Pulse Alarm during
a system startup.)
Default = 0 – No multiplier; alarm generated immediately (normal mode with 2 s
extension delay)
Bit 03 02 Alarm periods before alarm generated
0 0 No multiplier; alarm generated immediately (normal mode with 2 s
extension delay)
0 1 2 sample periods + 2 s delay before alarm
1 0 8 sample periods + 2 s delay before alarm
1 1 32 sample periods + 2 s delay before alarm
Bit 04 Frequency or Acceleration Alarm Select (channel 1) – Determines if the value in the
Maximum Frequency or Acceleration write word is a Frequency (actual or scaled) or
Acceleration Alarm value. If set to Frequency, Acceleration is not calculated.
0 = Frequency alarm
1 = Acceleration alarm
Default = 0 – frequency alarm
Bits 05…06 Acceleration Calculation Time (channel 1) – Specifies the number of Frequency Sample
Times over which the module calculates acceleration.
Default = 0 – Rolling Average (previous 4 samples)
Bit 06 05 Acceleration Calculation Time in Frequency Sample Times
0 0 Rolling Average (previous 4 samples)
0 1 8
1 0 16
1 1 32
Bit/Word Definitions for the Block Transfer Write Words
Word Bit Definition