Rockwell Automation 1794-IJ2XT FLEX I/O Frequency Input Modules User Manual - Manual (Page 14)

Publication 1794-6.5.11 - September 2011
4 Overview of the Frequency Input Module
Typical Communication between a FLEX I/O Module and an Adapter
FREQ GATE OK
0
FREQUENCY INPUT 2 CHANNEL
1
1794-IJ2
F 0 F
FREQ GATE
1 F 1 F
OUT
0
OUT
1
45339
The adapter transfers your configuration data
to the module using a BTW.
1
FlexBus
Your ladder program instructs the
adapter to perform a BTR of the
values and stores them in a
data table.
4
The adapter module determines that the
transfer was made without error and
input values are within specified range.
5
Your ladder program can use and/or
transmit the data (if valid) before it is
overwritten by the transfer of new data in
a subsequent transfer.
6
Your ladder program performs BTWs to
the module when you power it up, and
any time you wish to reconfigure the
module.
7
External devices
transmit frequency
signals to the module.
2
The module converts
frequency signals into
integer format and stores
these values until the
adapter requests their
transfer.
3
1794-ACN15
1794-ACNR15
1794-ACNR15K
1794-ADN
1794-AENT
1794-APBDPV1
1794-ASB
1794-APB
Adapter
1794-AENT shown