Allen-Bradley FLEX I/O 1794-IJ2, Руководство пользователя, Страница: 11 / 80

Publication 1794-6.5.11 - November 1997
1-2 Overview of the Frequency Input Module
What the Frequency Input
Module Does
The frequency input module performs high-speed frequency and/or
scaling calculation operations for various industrial applications. The
module interfaces with a FLEX family adapter which then communicates
with a programmable controller processor that has block-transfer
capability and external I/O devices.
The adapter/power supply transfers data to the module (block transfer
write) and from the module (block transfer read) using BTW and BTR
instructions in your ladder diagram program. These instructions let the
adapter read input values and status from the module, and let you write
output values and configure the module’s mode of operation. The
following illustration describes the communication process.
500/50mV
50mV
Select
24V IEC 1+ 24V IEC 1+
Magnetic
500/50mV
Magnetic
Gate Input
Frequency Input
CRISP
Bus Interface
Output 0
Output 1
Inter-Processor
Communication,
uP System 0/1
from
uP System 1
Data To/From Flexbus
Invert
Y/N
Invert
Y/N
Processing
Counter
Frequency / Count Data
uP System 0
Output Control
Input Control
Direction Data
IEC 1+/Contact
Input
VORTEX
Vortex
3Vin 6Vin 24V Power
IEC 1+/Contact
Input
50mV
Select
GND
GND
Inputs
Module
Flexbus
24V Power
24VPower
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