5.4 Details of Function Codes
5-252
Data Function Description
9 Rising & falling edges detector +
General-purpose timer
Rising and falling edge detector with 1 input and 1 output, plus
general-purpose timer.
This detects both the falling and rising edges of an input signal and
outputs the ON signal for 2 ms.
10 Hold + General-purpose timer Hold function of previous values of 2 inputs and 1 output, plus
general-purpose timer.
When the hold control signal is off, the input signal is output. When
the hold control signal is on, the value before the input signal is
kept.
11 Increment counter Increment counter with reset input.
By the rising edge of an input signal, the logic circuit increments
the counter value by one. When the counter value reaches the
target one, the output signal turns on.
Turning the reset signal on resets the counter value to zero.
12 Decrement counter Decrement counter with reset input.
By the rising edge of an input signal, the logic circuit decrements
the counter value by one. When the counter value reaches zero,
the output signal turns on.
Turning the reset signal on resets the counter to the initial value.
13 Timer with reset input Timer output with reset function.
If an input signal turns on, the output signal turns on and the timer
starts. When the period specified by the timer has elapsed, the
output signal turns off, regardless of the input signal state.
Turning the reset signal on resets the current timer value to zero
and turns the output off.
The block diagrams for individual functions are given below.
(1) Through output (2) Logical multiplication (3) Logical sum
(4) XORing (5) Set priority flip-flop
(6) Reset priority flip-flop
Input 1 Input 2
Previous
output
Output Remarks
OFF OFF
Hold previous
value
OFF OFF
ON ON
- ON - OFF Reset priority
ON OFF - ON
Input 1 Input 2
Previous
output
Output Remarks
OFF OFF
Hold
previous
value
OFF
ON ON
OFF
ON - OFF
ON - - ON
Set
priority
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