Rockwell Automation 1794-IJ2XT FLEX I/O Frequency Input Modules User Manual User Manual
Page 51
Publication 1794-6.5.11 - September 2011
Read and Write Configuration Maps for the FLEX I/O Module 41
Word 0
(con’t.)
Bits 05
Frequency range bits (channel 1) – Specifies the Frequency Range of the Frequency
input.
0 = 1…32767 (below 1 Hz reports 0);
1 = 1.0…3276.7 (below 1.0 Hz reports 0.0).
Default = 0
Bits 06
Local fault mode selection – determines how the Module Safe State data is used to
control alarm outputs for bus communication and internal module faults.
Local Fault = Wire Off Fault or Missing Pulse Alarm.
0 = Safe states activated by bus communication only;
1 = Safe states activated by any failure (bus communication, internal module faults,
and so on.)
Default = 0, safe states activated by bus communication only
Bits 07
Not used
Bits 08…09
(10…11)
Missing pulse multiplier bits (channel 0) – 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
09
(11)
08
(10)
Minimum frequency sampling time
0
0
No Multiplier, alarm generated immediately (normal mode
with 2 s delay)
0
1
X2
1
0
X8
1
1
X32
Bits 10…12
(12…14)
Number of pulses to terminate sampling (channel 0) – 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
12
(14)
11
(13)
10
(12)
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
Bit/Word Definitions for the Block Transfer Write Words
Word
Bit
Definition