2
Features
Section 1-1
1-1
Features
The C200H-CT021 High-speed Counter is a Special I/O Unit for the C200H,
C200HS, C200HX, C200HG, and C200HE PCs.
The High-speed Counter Unit has the following features.
Two Built-in Counters
The High-speed Counter Unit has two high-speed increment/decrement
counters, each of which can be connected to an incremental encoder with
open collector output to count line driver input pulses at a rate of 75,000 cps
max.
Built-in Line Driver Input
Circuit
An encoder with RS-422 line driver output can be directly connected to the
High-speed Counter Unit. Line driver input resists noise, thus making it possi-
ble to connect the encoder to the High-speed Counter Unit through a long
cable or to wire the cable in places where noise may be generated.
An open collector output from an encoder can be connected as a line driver
input to the High-speed Counter Unit through the C500-AE001 Encoder Con-
version Adapter.
Counts in BCD or
Hexadecimal
The High-speed Counter Unit can count BCD or hexadecimal values.
The following are the available counting ranges.
BCD:
–8,388,608 to 8,388,607
Hexadecimal:
800000 to FFFFFF (–8,388,608 to –1) and 000000 to
7FFFFF (0 to 8,388,607)
Refer to page 10 for the data configuration of the count value in hexadecimal.
Seven Operating Modes
The High-speed Counter Unit has the following three functions and seven
operating modes. None of the three functions are available to the High-speed
Counter Unit in simple counter mode, which is the basic operating mode of
the High-speed Counter Unit.
Simple Counter Mode: Counts the number of input pulses.
Drum Function
Linear Mode:
Controls outputs when the count value is in a preset range.
The High-speed Counter Unit counts the number of pulses
within the available counting ranges.
Circular Mode: Controls outputs when the count value is within a preset
range. The High-speed Counter Unit counts the number of
pulses from zero to the maximum countable value preset with
the High-speed Counter Unit. The count value is reset to zero
after it reaches the maximum countable value.
Preset Counter Function
Preset Mode:
Controls outputs after counting a preset value.
Counting Function
Gate Mode:
Counts the number of pulses only while the control
input signal is turned ON.
Cumulative Gate Mode: Accumulates the number of pulses whenever the
control input signal is turned ON.
Sampling Mode:
Counts the number of pulses for a preset interval
from the rising edge of the control signal.
Eight Types of External
Outputs
The High-speed Counter Unit has eight external outputs, either NPN or PNP.
Three Types of Pulse
Inputs
The following three types of pulse inputs are available.
• Offset phase inputs
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