PLC ladder diagram programs limited the maximum operating frequency of the counter by the scanning cycle, generally only dozens of Hz. In industrial control, sometimes requires fast PLC counting function, pulse count may come from rotary encoders, mechanical switches or electronic switch. High speed counting modules for dozens of even hundreds kHz Hz pulse count, most of them have one or a few discrete output points, the current value of the counter is equal to or greater than the preset value, you can interrupt program change switch output status in a timely manner. This process has nothing to do with the PLC scanning process can ensure the load is driven.
High speed counting modules of the FX2N FX2N-1HC 1 high speed counter, can be used for single phase/dual phase 50kHz of high speed counter, external input or through a PLC program counter can be reset or start counting process, it can be connected to the encoder. When the phase 1 and phase 2 input is less than 50kHz, bipolar input can be set to 1 time multiplier, twice times and 4 times frequency patterns, frequency 50kHz,25kHz and 12.5kHz, respectively. Count value to a 32-bit signed binary number, or two 16-bit unsigned numbers (O~65 535). Count method for automatic plus/minus counts (1 2–input/2–phase input) or optional plus/minus counts (1–phase, 1 input). Available hardware comparer implementation setting value and the values, consistent output, or using software to realize consistent output (maximum delay 200 µ s). It has two NPN open collector output, rated value is DC5~12V,0.5A. Instantaneous value, compare results and error status can be monitored, 8 I/O point in your program.
PLC ONE 