02.05 4 Signal description
© Siemens AG 1998 All Rights Reserved
FM-STEPDRIVE/SIMOSTEP (FB)
4-3
4.2 Signal interface
The signal interface has two 24 V optocoupler inputs and two optocoupler
outputs.
READY2
ZERO
MSTILL
GATE_N
M (24 V GND)
L+ (24 V)
ENABLE_N
Note
The technical data of the pulse interface are described in chapter 3.
The signal timing of the inputs/outputs is described in chapter 4.3.
Inputs:
GATE_N
(enable/disable
pulses)
With 24 V at the GATE_N input, the pulses active on the PULSE input are
used for controlling the stepping motor. With 0 V or open input GATE_N,
active pulses are disabled. This function can be used in a multi-axis
system for selecting individual axes.
This input is displayed via the GTE LED (see page 8-2).
ENABLE_N (enabling
the amplifier)
When the ENABLE_N input is energized, the power controller is enabled.
After approx. 500 ms, the power controller reports readiness via the
READY1_N and READY2 outputs and the motor is energized. If 24 V are
present at the GATE_N input of the signal interface, clock pulses can be
supplied to the PULSE input.
Outputs:
ZERO (ring counter
zero signal)
When the internal ring counter is zero, 24 V are present on the ZERO
output. Reference movements with step accuracy can be performed by
evaluating the ZERO signal. At a motor speed of 300 revolutions/minute,
the pulse width of the ZERO signal is equivalent to the duration of the
PULSE signal period.
At a higher motor speed, the pulse width of the ZERO signal is reduced.
READY2
(readiness)
When the ENABLE input is activated, the power controller reports
readiness via the READY2 output. When the power controller is ready,
24 V are present on the READY2 output. If 24 V are present at the
GATE_N input of the signal interface, clock pulses can be supplied to the
PULSE input. In case of a power controller fault, or if a power controller
enable signal has not been received via the ENABLE input, the READY2
output has high resistance.
MSTILL
(Motor standstill)
With the GATE_N input, the clock signal at the PULSE input can be
disabled so that the motor is brought to a standstill.
The motor standstill enforced by GATE_N is acknowledged by the
MSTILL signal.
At 0 V or if the GATE_N input is open, 24 V are present at the MSTILL
output; the motor shaft cannot move.
Applying 24 V to the GATE_N input is acknowledged by 0 V on the
MSTILL output, and the motor shaft can move again.
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