12.7 I/O Extension
The
M50PCI
stepping motor card
has an I/O interface that provides 8 ports, which can be
used independently of one another as inputs or outputs. Configuration of each pair of these
ports as inputs or outputs is done by software (see in the manual on support CD).
The I/O interface also has a 5Vcc output (pin1), which can handle approx. 80-100mA and
has a self-resetting electronic fuse.
If the ports are defined as
outputs
, 3.5V/20-30mA will be available via 33ohms relative to the
Gnd (pin9) when these ports are in their active state. Thus, LEDs/optocouplers or small
relays can be directly controlled.
If the ports are defined as
inputs
, Vcc (Pin1) can be applied to the inputs via a resistance of
200-1,000 ohms in order to activate these inputs. The auf die Eingänge gelegt werden, um
sie zu aktivieren. The Vias are designed so that they cannot be damaged even if an external
load resistor is not used and they are directly connected to Vcc.
12.8 Accuracy and Resolution
The absolute resolution that can be obtained with the
M50PCI
stepping motor card
depends
on the stepping motor used. A mechanical error of the motor and the stage
also influence
this resolution.
For a motor with a 1,500mA/phase current and 200 full steps per revolution, the absolute
position error is typically < ±3µm related to the transfer of motion to a linear movement by a
2mm spindle.
The theoretical resolution of the
M50PCI
stepping motor card
is approx. 1/256 of a full step.
The electromagnetic resolution attainable under real conditions depends on diverse factors;
these include the ratio of the nominal torque to the torque under load, the motor power
supply, and the ratio of the nominal current of the motor to the maximum current of the
M50PCI
stepping motor card
.
Under favorable conditions, a resolution of 1/100 of a full step can be achieved In the
example above, this would correspond to a resolution of 0.5-1 µm.
You will find more detailed instructions and guidance on programming in the
complete operating instructions on the Support CD supplied along with the
controller.
402310 34 M50.PCI
