The PCL-833 from Advantech is a three-axis quadrature encoder and counter add-on card for PC/AT compatible computers. Optically isolated up to 2500 V, it allows a PC to perform position monitoring for motion control systems. Each input includes a decoding circuit for incremental quadrature encoding. Inputs accept either single-ended or differential signals. Quadrature input operates with or without an index, allowing linear or rotary encoder feedback.
The counter card has three independent 24-bit counters which are capable of cascading up to 48 bits. The maximum quadrature input rate is 1 MHz and the maximum input rate in counter mode is 2,4 MHz. Each counter can be individually configured for quadrature decoding, pulse/direction counting or up/down counting.
Five digital input channels are available with each channel accepting digital input as an index input for a rotary encoder or as a home sensor input for a linear encoder. An interrupt to the system can be generated based on a signal from the digital inputs, overflow/underflow of the counters or on a programmed time interval. Interrupts can be generated repeatedly at any time interval from 0,1 ms to 255 s, allowing precise speed monitoring of the control system.
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