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1 Introduction
Digital Input Function
This Unit supports two Digital Inputs (I0 and I1) which can be allocated freely for each Counter. A
function can be selected from among eight types of functions and allocated for each Digital Input
according to the user application.
Function allocation makes it possible to use the Digital Inputs together with gates, presets, resets,
etc. (Refer to 3-4 Digital Input Functions).
Digital Output Control
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To control the Outputs, the Unit can be configured in one of the two following Output Control Modes:
• Range Mode (refer to 3-5-1 Range Mode)
• Comparison Mode (refer to 3-5-2 Comparison Mode)
In Range Mode, up to 32 Ranges can be applied to individual Counters. Every Range can control a
maximum of 32 Outputs. An Output is turned ON when the Counter is in the corresponding Range.
In Comparison Mode, up to 32 comparison data can be applied to individual Counters. Depending
on the direction of counting, an Output can be set or reset (configurable) on reaching the Compari-
son Value. Every Comparison Value can control up to 32 Outputs.
Furthermore, by setting and resetting I/O ports for output data in the CPU Unit, Digital Output can be
controlled manually (refer to 3-5-3 Manual Output Control).
You can set to hold the output in the previous status or to put it into the defined status for when the
CPU Unit Operating Mode is changed from RUN Mode to PROGRAM Mode, when an I/O bus check
error occurs or when an overflow/underflow error occurs (refer to 3-5-4 Output Control Configura-
tion).
Resetting Counter Value
Resetting of the Counter Value can be freely configured depending on the application needs. The
following sources can trigger a reset:
• Software bit in the PLC
• Z-Input
• Digital Input (that is configured as a Reset Input)
To enable resetting a Counter Value, an Digital Input must be configured as Enable Reset Input
and/or the Software Enable Reset bit can be used (refer to 3-6 Reset Counter).
Programmable Output Pulses
The timing characteristics of the Digital Outputs can be modified, depending on the requirements of
the application as follows (refer to 3-7-1 Programmable Output Pulses):
• Output Turn ON Delay [1 ms to 9999 ms], to delay turning ON an Output
• Output Pulse Duration [1 ms to 9999 ms], to generate an Output pulse of the specified duration
Hysteresis
For Counters in Range Mode a hysteresis can be configured [1 to 255 counts], to prevent Outputs
from toggling due to unwanted oscillating of encoding equipment (e.g. rotary incremental encoder)
around the upper/lower limits. Refer to 3-7-2 Hysteresis.
CJ-series High-speed Counter Units Operation Manual for NJ-series CPU Unit(W492)
1-3
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