Special Functions - IDEC FT1A Series User Manual

1: G I
ENERAL NFORMATION

Special Functions

This section describes the functions of the SmartAXIS.
I/O Related Functions
Catch Input
The catch input receives short input pulses from sensors without regard to the scan time. A maximum of 6 catch inputs can be
used.
Input Filter
The input filter can be adjusted, according to the width of input signals, to reject input noises. Selectable input filter values to pass
input signals are 0ms, and 3 through 15ms in 1ms increments. The input filter rejects inputs shorter than the selected input filter
value minus 2ms. This function is useful for eliminating input noises and chatter in limit switches.
Interrupt Input
The interrupt input can be used to call an interrupt program to respond to an external input that requires a response faster than
the scan time. A maximum of six interrupt inputs can be used. This can only be used when ladder program is selected as the
programming language.
Stop and Reset Inputs
Stop input is a function to stop SmartAXIS operation. Reset input is a function to stop SmartAXIS operation and clear device
values. Any input terminal on the SmartAXIS can be designated as a stop or reset input to control the SmartAXIS operation.
Remote I/O
When the number of SmartAXIS inputs and outputs is insufficient, the number of inputs and outputs can be expanded to a
maximum of 192 points by connecting additional SmartAXIS as remote I/O slaves over Ethernet. With the remote I/O function, the
analog inputs on the SmartAXIS that are connected as remote I/O slaves can also be used.
Analog Input
Analog input of 0 to 10V DC can be converted to a digital value of 0 to 1000. A maximum of eight inputs can be used as analog
inputs (not including remote I/O slaves analog inputs).
Forced I/O
The inputs and outputs of the SmartAXIS can be forced on or off. This function can be used to check the I/O wiring or the user
program operation.
Pulse I/O Functions
High-speed Counter
This function counts high-speed pulse inputs that cannot be measured in normal user program processing.
Use this function for applications such as positioning control with a rotary encoder or motor control. The SmartAXIS can use single-
phase high-speed counters and two-phase high-speed counters. A maximum of six single-phase high-speed counters and a
maximum of two two-phase high-speed counters can be used simultaneously.
Example: Controlling a motor by counting two-phase pulse input with a high-speed counter
Pulse motor
Rotary
encoder
Two-phase pulses
1-4
High-speed pulse input
SmartAXIS
S AXIS P /L
MART RO ITE
U ' M FT9Y-B1378
SER S ANUAL