3-7
3 Operation and Configuration
CJ-series High-speed Counter Units Operation Manual for NJ-series CPU Unit(W492)
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3-2-1 Simple Counter
The advantage of using a Counter as a Simple Counter is that you do not have to set any device vari-
ables for CJ-series Unit. Instead, all default settings are used. In other words, Simple Counters can only
be used in a default configuration. If you intend to use the High-speed Counter Unit only with Simple
Counters the information as described in this section "Simple Counter", covers all the default features
and functions that are important and available to you.
z
Simple Counter Function Outline
To use all the functions of a High-speed Counter Unit, set the Unit to a Circular Counter or Linear
Counter, instead of a Simple Counter. For details on Circular Counters, refer to 3-2-2 Circular Counter;
for details on Linear Counters, refer to 3-2-3 Linear Counter.
z
Simple Counter Configuration
The following features and functions are supported for Simple Counters:
• Simple Counters can count up and down within the 32-bit count range (the same as a Linear
Counter can). Refer to 3-2-3 Linear Counter.
• You can preset or rest the Counter Value of a Simple Counter by using device variables for CJ-
series Unit (for input/output) and you can open or close the gate to allow counting pulses or not.
• With Simple Counters, only phase differential signals (multiplication x 1) can be connected. You
cannot use the Z signal to trigger a reset, only its status is reported in device variables for CJ-
series Unit (for input). (Accordingly, you can trigger a reset indirectly via the user program.)
• The noise filter for Digital Inputs is fixed to 50 kHz. This means that, the maximum frequency of
the input pulses up to 50 kHz is guaranteed.
• For High-speed Counter Unit Digital Output, only manual output control is possible by using the
corresponding device variables for CJ-series Unit (for output).
• The two Digital Outputs use an NPN-output driver.
• You cannot assign the Digital Inputs to individual Counters and you cannot configure the function
of the Digital Inputs. Only the status of the Digital Inputs is reported in device variables for CJ-
series Unit (for input). For the method of allocating Digital Inputs to circular or Linear Counters,
refer to 3-4 Digital Input Functions.
• Errors are normally reported in device variables for CJ-series Unit (for input).
3-2-1
Simple Counter
Function
Specifications
Counter operation
Linear
Counting range
−
2,147,483,648 to +2,147,483,647
Count Mode
Phase difference, multiplication x1
Counting speed
50 kHz
Gate open/close
Device variables for CJ-series Unit are used
External outputs
Manual output control only
Output form
NPN
Reset
Device variables for CJ-series Unit are used