ADLINK PCI-8124-C - Manual (Page 11)

Introduction 1
1 Introduction
The PCI-8124-C is an advanced quadrature encoder counter
board with position compare and high speed trigger pulse output
capability. 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-C 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 the encoder input frequency can be up to
20 MHz. Users will not need to worry about noise disturbance
through the use of a digital filter. With adjustable pulse width,
users can change this with software control as they wish. Further-
more, the relation between comparator and trigger output is mutu-
ally corresponding – One comparator to multi-trigger outputs or
Multi-comparators to one trigger output. Eventually, the quantity of
trigger output pulse will be counted and stored in the trigger coun-
ter.
The PCI-8124-C 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.