Jetter JX2-IO16, Руководство пользователя

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JX2-IO16 9.1 Fast Inputs
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9 Fast inputs - Software filter
9.1 Fast Inputs
All digital inputs are provided with an input delay feature. The input signal is recognized
by the JX2-IO16 module once the delay time has elapsed. The delay time for inputs 1
- 4 is preset (hardware filter); for more information refer to chapter "Technical Data of
Digital Inputs", page 30. The delay time for inputs 5 - 8 is adjustable (software filter);
for more information refer to chapter "Technical Data of Digital Inputs", page 30.
The delay time for inputs 5 - 8 can be set to a significantly shorter duration, than the
delay time for inputs 1 - 4. Therefore, inputs 5 - 8 are called "fast inputs".
Using the shortest possible delay time, a fast input is able to reliably recognize a
pulse length of 250 µs for high or low pulses.
The default value for adjustable delay time of fast inputs has been set in a way that
it ensures compatibility with the other inputs.
9.2 Software filter
The fast inputs 5 - 8 are provided with a software filter. Read / write access to the
delay time of the software filter is performed through register array elements 45 - 48.
Except for the value 0, the filter time is a multiple of 128 µs and is calculated by the
following formula:
Input delay time = (delay time + 1) x 128 µs.
Register 3xx8 = 45 - 48
Register 3xx9: Software filter - Delay time
Inputs 5 - 8
Function Description
Read Present delay time
Write New delay time (immediately effective)
Value range 0 ... 255
Value after reset 21 (2.8 ms)
0: Input delay time = max.180 µs
1: Input delay time = max. 256 µs
2: Input delay time = max. 384 µs
...
255: Input delay time = 32.64 ms