Omron CJ1W-CT021 Operation Manual page 29

Specifications and Characteristics
Item
Output State Control
Output Driver Configuration
Reset Signals
Extra Functions
Noise Filtering Counter Inputs
and Digital Inputs
Initial Counter Value
CJ1W-CT021
On changing the Operating Mode of the PLC from RUN/MONITOR
→ PROGRAM, an I/O Bus Error or an Overflow/Underflow
Error, the Digital Outputs can be configured to:
• Continue automatic updating Output States
• Freeze Output States*
• Predefine Output States*
Refer to 3-5-4 "Output Control Configuration".
The Output Driver of every Digital Output can be configured as:
• NPN
1
• PNP*
Refer to 3-5-4 "Output Control Configuration".
Every Counter can be reset to zero by (a combination of) the following sources:
• Software Counter Reset Bit
• Digital Input* 1
• Z-Input* 1
Refer to 3-6 "Reset Signals".
• Programmable Output Pulse*
To every Digital Output an ON-delay and/or a Pulse Duration [1, 9999 ms]
can be applied (refer to 3-7-1 "Programmable Output Pulses")
• Rate Measurement*: For every Counter the Pulse Rate can be measured by
defining a Time-Window [1, 9999 ms]. Up to a maximum of 64 Rate Values
are stored in the Rate History Log File. Rate Values from the Rate History
Log File can be read using the IORD-instruction. Additionally for every
Counter two Rate Ranges can be defined that control the Outputs according
to the measured Rate Value. Refer to 3-7-2 "Rate Measurement".
1
• Hysteresis*
: To prevent Outputs from being switched On and Off by very
small fluctuations in the Counter Value around Range Limits, for every
Counter an Hysteresis-value [1, 255] can be defined (the Unit must in Range
Mode). Refer to 3-7-3 "Hysteresis".
To suppress noise on the signal lines of the Counter Inputs (A and B) and the
Digital Inputs (I0 and I1) a Noise Filter can be configured:
1
• 10 kHz*
• 50 kHz (default)
1
• 500 kHz*
For the Digital Inputs the 500 kHz filter can not be selected. The Z-Input
Signals of every Counter are filtered with a fixed Noise Filter of 1 kHz. Refer to
3-7-4 "Noise Filtering".
• The Initial Counter Value*
Powered Up or Restarted. The Initial Counter Value is very useful to
overcome problems in case of power failure. Refer to 3-7-5 "Initial Counter
Value".
1
1
1
:
1
is transferred to the Unit when the Unit is
Section 1-3
9