12.6 Time Constant Processing
The input time constants for 32 points of the CPU input X0 to X1F can be set by the system registers
430 to 437. If this setting is specified, an operation like the equivalent circuit below will be performed.
By the setting, the noises or chattering of input will be removed.
CXn = Input signal of Xn contact
Xn = Image memory of input Xn
Note:
•
• If the partial update instruction is executed for the input in the time constant processing, the time
constant processing will be invalid, and the input status at the time will be read out and set.
The input signal of X contact is retrieved at the timing of the normal I/O update.
• The time constant processing can be performed for the input other than X0 to X1F (add-on cassettes
or expansion units) by the F182 (FILTR) instruction.
• The time constant processing is invalid when the high-speed counter, pulse catch or interrupt has been
specified.
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