Panasonic LC2H Counter-Related Terminology, Types Of Counters, Rating, Countings, Outputs, Others

COUNTER-RELATED TERMINOLOGY

TYPES OF COUNTERS

1. Electro Preset Counter

The counter is equipped with semicon- ductor counting circuitry. When the counter counts up to a preset number, its output circuit sends a signal.

2. Electro Magnetic Counter

A magnet is magnetized and demagne- tized to drive the dial and count up num- bers.

RATING

1.Rated Operating Voltage The voltage is applied to start the counter.

COUNTINGS

1. Pulse

This is a voltage or current signal sent at intermittent time intervals.

2. Count

Pulses are used to count up and down.

3. Miss-count

This happens if the number of pulses does not correspond to the number of counts.

4. Hertz

This unit of counting speed is used to give the number of counts per one second.

5. Make Ratio

This is the ratio of ON time (Ta) to OFF time (Tb).

Ta Tb

Time

6.Maximum Counting Speed Suppose that the counter is operated with an input pulse of a make ratio of 1. The highest counting speed is the peak of a range in which the output circuit can send signals without mis-counting. The speed is expressed in units of Hz (cps: counts per a second).

7.Over Count

Counting continues beyond a preset number.

8. Recount

When counting is up, the counter display resets to zero and counting restarts.

9. Down Count

Numbers are counted down one by one from a preset number.

10. Up Count

Numbers are counted up one by one from zero.

11. Up/Down Count

Numbers are counted up or down depending on input conditions.

12. Rejection (gate) Input

This signal is used to keep the counter from counting.

OUTPUTS

1. Count Up

When a preset number is reached, the output circuit sends a signal.

2. Retained Output

The output is held until a reset signal is sent.

3. One Shot Output

This output has a specified width of time.

RESETTINGS

1. Reset

The counting process, display and output sections are all brought back to the initial status.

2. Power off Reset

The operating voltage is turned off to reset the counter.

3. Manual Reset

The counter is manually reset.

4. Remote Reset

A signal is sent from a remote point to the reset terminal so as to reset the counter.

5. Automatic Reset

When counting is up, internal circuitry is activated to automatically reset the counter.

6. Reset Signal Width

This is the time during which the power is off so as to reset the counter or during which an external (manual) reset signal is sent.

7. Reset time

This is the time from the moment a reset signal is sent to the instant the counter is ready to start counting again.

OTHERS

1.Function of Memorizing Condition Counting data up until the operating voltage is turned off can be stored in memory. When the power is reactivated, the data can be reproduced.

2.Anti-surge

The strength against power voltage surge is determined by applying a single- pole full-wave voltage (several hundred to several thousand volt wave for ±(1.2 ⋅

50)µs) acrosss the control power terminals.

Surge waveform

[Single-pole full-wave voltage for ±(1.2 ⋅

50) µs]
	100
)	90
%
(
voltage	50		Peak value
Surge	30
	0	0	1.2	50
			Time (∝s)

3. Noise Immunity

This is the strength against external noise. Relay noise tests, noise simulator tests, etc. are conducted.

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