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Operation Theory 69

ADLINK Technology Inc. PCI-9524

4.5 Isolated Pulse-Command Generator

There are three opto-isolated differential pulse output channels in

PCI-9524, supporting typical servo amplifiers equipped with opto-

isolated inputs and/or differential line-receivers. Each pulse-com-

mand channel can be programmed to support single phase or dual

phase operations, including DIR/CLK and CW/CCW direction con-

trol.

The pulse-command generator has two operating modes, Burst

mode and Infinite Mode. The former generates user specified

pulses, while the later generates pulses continuously until a stop

command is issued by user's application.

The pulse frequency, and duty-cycle can be programmed through

a windows API, although most servo amplifiers accept a 50% duty

cycle as default.

Servo amplifiers using opto-coupler input stages generally accept

as high as 500-kHz pulses per second. For higher speed pulse-

command applications, use servo amplifiers with differential line-

receivers. Use twisted pair wiring for high-speed differential signal

transmissions to ensure low EMI leakage.

The pulse-command generator has a built-in pulse comparator

that generates an AD trigger signal when the number of pulses

generated has reached a user specified threshold.

4.6 Isolated Digital I/O

PCI-9524 supports eight channels of opto-coupler isolated digital

inputs, and eight channels of N-MOS sink drivers. Users can use

these I/O functions to control relays, actuators, bulbs, etc...

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Adlink PCI-9524 Manual do Utilizador Página 85