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1-2
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ANUAL
Special Functions
The
OpenNet Controller
features various special functions packed in the small housing as described below. For details
about these functions, see the following chapters.
“Keep” or “Clear” Designation of CPU Data
Internal relays, shift register bits, counter current values, and data register values can be designated to be kept or cleared
when the CPU is powered down. All of these data or a specified range of these operands can be designated as keep or clear
types.
Catch Input Function
The catch input function makes sure to receive short input pulses (rising pulse of 40 µsec or falling pulse of 150 µsec min-
imum) from sensors without regard to the scan time.
Input Filter Function
The input filter can be adjusted for the pulse widths to accept or reject input signals. This function is useful for eliminating
input noises and chatter in limit switches.
High-speed Counter Function
The
OpenNet Controller
has a built-in high-speed counter to make it possible to count up to 65,535 (FFFFh) high-speed
pulses which cannot be counted by the normal user program processing. The maximum count input frequency is 10 kHz.
This function can be used for simple positioning control and simple motor control.
Key Matrix Function
A matrix configuration consisting of 16 inputs and 16 outputs enables to read a maximum of 256 input signals.
User Program Read/Write Protection
The user program in the CPU module 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.
Week Programmer Function
Week programmer instructions can be programmed to compare the preset date and time with the internal realtime calen-
dar/clock. When the preset values are reached, designated outputs can be turned on and off as programmed for the week.
RUN/STOP Selection at Startup when “Keep” Data is Broken
When data to be kept such as “keep” designated counter values are broken while the CPU is powered down, the user can
select whether the CPU starts to run or not to prevent undesirable operation at the next startup.
Module ID Registration
Another protection method to run or stop operation is the module ID registration. When disparity is found between the
module ID registration and actual modules in the system setup, the CPU can be made to start to run or not.
User Memory Download from Memory Card
A user program can be transferred using
WindLDR
from a computer to a miniature memory card. The handy miniature card
can be inserted into the CPU module to download the user program. User programs can be replaced without the need for
connecting to a computer. This feature is available on CPU modules FC3A-CP2KM and FC3A-CP2SM.
Constant Scan Time
The scan time may vary whether basic and advanced instructions are executed or not depending on input conditions to
these instructions. When performing repetitive control, the scan time can be made constant by entering a required scan
time value into a special data register reserved for constant scan time.
Keep Output Status during User Program Download
Outputs can be designated to maintain the current statuses when downloading a user program from
WindLDR
to the CPU.
This function can be used when the output status change does not occur frequently.
Stop and Reset Inputs
Any input number can be designated as a stop or reset input to control the
OpenNet Controller
operation.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
