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Analog Motor Command
Amp Enable
PWM/STEP OUT
PWM/STEP OUT
Sign/Direction
Error
Output 1-Output 8
Output 9-Output 16
(DMC-1080 only)
DMC-1000
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+/- 10 Volt range signal for driving amplifier. In servo mode,
motor command output is updated at the controller sample rate. In
the motor off mode, this output is held at the OF command level.
Signal to disable and enable an amplifier. Amp Enable goes low
on Abort and OE1.
PWM/STEP OUT is used for directly driving power bridges for
DC servo motors or for driving step motor amplifiers. For servo
motors: If you are using a conventional amplifier that accepts a
+/-10 Volt analog signal, this pin is not used and should be left
open. The switching frequency is 33.4 Khz for DMC-1000 and
16.7 Khz for DMC-1000-18 . The PWM output is available in two
formats: Inverter and Sign Magnitude. In the Inverter mode, the
PWM signal is .2% duty cycle for full negative voltage, 50% for 0
Voltage and 99.8% for full positive voltage. In the Sign
Magnitude Mode (Jumper SM), the PWM signal is 0% for 0
Voltage, 99.6% for full voltage and the sign of the Motor
Command is available at the sign output.
For stepmotors: The STEP OUT pin produces a series of pulses
for input to a step motor driver. The pulses may either be low or
high. The pulse width is 50%. Upon Reset, the output will be low
if the SM jumper is on. If the SM jumper is not on, the output will
be Tristate.
Used with PWM signal to give the sign of the motor command for
servo amplifiers or direction for step motors.
The signal goes low when the position error on any axis exceeds
the value specified by the error limit command, ER.
These 8 TTL outputs are uncommitted and may be designated by
the user to toggle relays and trigger external events. The output
lines are toggled by Set Bit, SB, and Clear Bit, CB, instructions.
The OP instruction is used to define the state of all the bits of the
Output port.
Appendices • 151
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