IDEC FT1A Series User Manual page 15

1: G I
ENERAL NFORMATION
Positioning Control
The SmartAXIS can perform positioning control with pulse outputs. The SmartAXIS features the PULS instructions that can
generate pulse outputs with configured frequency at the fixed pulse width ratio, pulse-width modulation (PWM) instructions that
can generate pulse outputs with configured pulse width ratio at a fixed frequency, RAMP instructions for trapezoidal control, ZRN
instructions for zero return operation, and ARAMP instructions that can generate pulse outputs according to a table in which the
changes of the frequency are configured.
Example: Pulse output by the RAMP instruction
Steady pulse frequency
Initial pulse frequency
Frequency Measurement
This function measures the frequency of pulses input to an input terminal. The frequencies of a maximum of six inputs can be
measured.
Convenient Functions
Calendar/Clock
The SmartAXIS features a real-time clock on-board. Using the calendar and clock function, the SmartAXIS can operate according
to the current date and time. These functions can be used to control a time schedule for lighting or air conditioning equipments.
User Program Read/Write Protection
The user program in the SmartAXIS can be protected against reading and/or writing by including a password in the user program.
This function is effective for security of user programs.
"Keep" or "Clear" Designation of SmartAXIS Data
Internal relays, shift register bits, counter current values, and data register values can be designated to be kept or cleared when
the SmartAXIS is powered down. All or a specified range of these devices can be designated as keep or clear types.
RUN/STOP Selection at Startup when "Keep" Data is Lost
When the backup battery is dead, all data to be kept are lost. The user can select whether the SmartAXIS starts to run or not to
prevent undesirable operation at the startup.
Log Data
Device values of the SmartAXIS can be saved as CSV files on the SD memory card. The DLOG instruction saves device values to
the SD memory card. The TRACE instruction accumulates device values at each scan and saves them to the SD memory card at
the desired timing.
Constant Scan Time
The variations in scan time that occur when the user program is running can be made constant.
Timer Interrupt
The timer interrupt can be used to call an interrupt program at a predetermined interval of time without being affected by the scan
time. This can only be used when ladder program is selected as the programming language.
S AXIS P /L U ' M FT9Y-B1378 1-5
MART RO ITE SER S ANUAL