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Introduction
The PCI-8124 is an advanced quadrature encoder counter board
with position compare and high speed trigger pulse output capabil-
ity. With a state-of-the-art of FPGA, it can meet most machine
maker requirements – high frequency encoder input and trigger
pulse output.
Typically, most machine makers design motion control systems
and vision inspection systems individually. Specifically, line scan
application, the frame grabber needs high frequency of trigger
pulse input to scan the whole image line-by-line. The more inten-
sive lines, the more precise images users can get. This means
users will have this demand for high frequency of trigger pulse
input. With the advantage of integrating the trigger board and
frame grabber together, the vision system completely retrieves the
encoder information from servo motors or linear scale and the trig-
ger pulse signal can be wired by flat cable internally. It is conve-
nient for system integrators and also reduces the possibility of
signal interference. With FPGA calculation, it can also save CPU
loading of host PC.
The PCI-8124 utilizes a FPGA and FIFO to realize the purpose. All
comparing points will automatically load into FIFO and be com-
pared with the internal comparators. As a result, users do not have
to handle this with software. Besides, the trigger pulse frequency
can be up to 5MHz and encoder input frequency can be up to
10MHz. With adjustable pulse width, users can change this with
software control as they wish. Furthermore, the relation between
comparator and trigger output is mutually corresponding – One
comparator to multi-trigger outputs or Multi-comparators to one
trigger output.
The PCI-8124 offers the board index design. This can let users
have one unique index number in the PC system. For input and
output channel, this board provides two types – TTL (without isola-
tion) and Open Collector (with isolation). The former one can
meet high frequency demand; the latter one can let users have cir-
cuit protection.
Introduction
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