Introduction; Characteristics - Delta AH500 Manual

AH5 00 Mod ule Manua l

7.1 Introduction

An AH500 series high-speed counter module has several bidirectional high-speed counters. It can
update the number of input pulses instantly. It can also cyclically update, prescale, and average the
number of sampled pulses. If the number of sampled pulses is monitored, an alarm can be
generated. The number of sampled pulses is added to the number of accumulated pulses. Users
can detect whether the number of accumulated pulses overflows, and compares the number of
accumulated pulses with a value.
 AH02HC-5A: There are two bidirectional high-speed counters. Only channel 0 and channel 1
are supported. Channel 2 and channel 3 are not supported.
 AH04HC-5A: There are four bidirectional high-speed counters. Channel 0~channel 3 are
supported.

7.1.1 Characteristics

1. Pulse formats which can be accepted
Single pulse, double pulse, one time the frequency of A/B-phase inputs, and four times the
frequency of A/B-phase inputs
2. Prescaling the number of input pulses
After the number of input pulses is multiply by a certain value, it will become a value which has a
specific significance.
3. Averaging the number of sampled pulses
The number of sampled pulses is divided by the number of cycles set by users.
4. Number of sampled pulses
The number of pulses sampled during the cycle can be prescaled. If the number of input pulses
is not even every time, it can be averaged. The number of sampled pulses is in the range of
-200000 to 200000.
5. Number of accumulated pulses
The number of pulses sampled during every cycle is accumulated. The number of accumulated
pulses is in the range of -999999999 to 999999999. The number of pulses sampled during
every cycle can be accumulated linearly or circularly.
6. Number of input pulses
The number of input pulses is updated every 10 milliseconds. The number of input pulses is in
the range of -2147483648 to 2147483647.
7. Alarm output
Users can set an upper-upper limit value, an upper-lower limit value, a lower-upper limit value,
and a lower-lower limit value. If the number of sampled pulses is larger than the upper-upper
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