Unit Functions And How They Work; Functions Of Unit - Panasonic FP7 User Manual

1.1 Unit Functions and How They Work

1.1.1 Functions of Unit

 Two or four-point 4 MHz/signed 32-bit high-speed counters are provided.
• High-speed counting of input signals is available up to the maximum frequency 4 MHz
(16MHz for 2-phase 4 multiple). It is selectable from 2-phase input (phase differential input),
individual input or direction detection input in accordance with input devices such as an
encoder and sensor.
 24 VDC, 12 VDC, 5 VDC inputs and line driver input are available.
• The count input circuit supports both an open collector output and a line driver output
(Differential output: Equivalent to AM26LS31).
 Selectable from ring counter or linear counter.
• Both the ring counter and linear counter are available. The Z phase of an encoder can be
used as count reset timing in the both methods.
 Frequency measurement function and Rotation speed measurement function are
provided.
• Frequencies are automatically measured in the unit from count values. Also, the rotation
speed is automatically measured from count values and the pulse number for one rotation.
The calculation results are directly stored in unit memories, thus no calculation using ladder
programs is needed.
 The count of internal clocks is available.
• Internal clocks occurred in the unit can be selected as count input signals. Timing
measurement is ahievable with high accuracy of the maximum resolution 0.25 µs. The
selectable internal clocks are 0.25 µs (4 MHz), 1 µs (1 MHz), 10 µs (100 kHz) and 100 µs
(10 kHz).
 Capture function and Sampling capture function are provided.
• It is possible to store the count value at the moment of the occurrence of a trigger assinged
to a control signal. The count value independent of the scan time of PLC can be confirmed.
• The capture function is used to execute capturing at the leading and trailing edges of control
signals, and the sampling capture function is used to execute capturing every sampling time
(T [ms]) by signla input.
• Buffer function is added, which can save up to 60 captured data. (Available form High-speed
counter unit Ver.1.2.)
 14 counter operations by input signals (input z signal, control signal and output
relay (Y relay).
1) Reset operation at rising edge, 2) Reset operation at trailing edge, 3) Positive logic reset operation,
4) Negative logic reset operation, 5) Preset operation at rising edge, 6)Preset operation at trailing edge,
7) Positive logic preset operation, 8) Negative logic preset operation, 9)Positive logic enable operation,
10) Negative logic enable operation, 11) Positive logic enable operation and reset operation at rising edge,
12) Negative logic enable operation and reset operation at trailing edge,
13) Positive logic enable operation and preset operation at rising edge,
14) Negative logic enable operation and preset operation at trailing edge
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