Connectors, I/O and Schematics
MultiFlex PCI 1000 Series User's Manual
195
Full/Half Current & Unipolar Direction Output
signal type
:
Open collector, current sink, 100ma max. current sink, 30V max.
notes
:
External pull-up may be required
explanation:
(Full/Half current) This signal is used if the stepper driver has a digital input for current
control. The default condition of this signal is to be inactive (pulled high). Setting the
MC_CURRENT_FULL
parameter of the
MCMotion
structure will cause the signal to be
pulled low.
This signal is driven by a high current open collector driver and is suitable for direct connection to optically
isolated inputs commonly found on a amplifier / driver. Because of the characteristics of open collector
drivers, no voltages will be present on these output signals unless a pull-up path to a supply voltage is
provided.
explanation (Unipolar Direction)
: For servo drives requiring a Unipolar output. The velocity or current
command input consists of a magnitude signal and a separate direction signal . The magnitude signal is
provided by the modules Analog Command Signal, while this signal provides a digital direction command.
Default Configuration of General Purpose I/O
i
The default configuration for the controller is for a Analog Command axis and a
Pulse Command axis to share opto isolated inputs and open collector drivers.
The user can change any of the default I/O function assignments by using the
I/O Configuration Panel
, described on pages 10 and 165.
TTL Digital Inputs
signal type
:
TTL (buffered by 74LS541)
Active
level
=
programmable
TTL high level input min. voltage = 2.0V
TTL high level input max. voltage = 5.0V
TTL low level input min. voltage = 0.0V
TTL low level input max. voltage = 0.6V
notes
:
Dual purpose, channels 1, 5, 9, and 13 can also be used for capturing the position of
axes 1/2, 3/4, 5/6, and 7/8
explanation
:
Two 74LS541 octal buffers are used to provide 16 TTL level digital inputs that allow the
user to monitor external events. For additional information please refer to the
General
Purpose I/O chapter
.
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