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DMC-1700/1800 Appendices • 205
Inputs
Encoder, A+, B+ Position feedback from incremental encoder with two channels in
quadrature, CHA and CHB. The encoder may be analog or TTL. Any
resolution encoder may be used as long as the maximum frequency
does not exceed 12,000,000 quadrature states/sec. The controller
performs quadrature decoding of the encoder signals resulting in a
resolution of quadrature counts (4 x encoder cycles). Note: Encoders
that produce outputs in the format of pulses and direction may also be
used by inputting the pulses into CHA and direction into Channel B
and using the CE command to configure this mode.
Encoder Index, I+ Once-Per-Revolution encoder pulse. Used in Homing sequence or Find
Index command to define home on an encoder index.
Encoder, A-, B-, I- Differential inputs from encoder. May be input along with CHA, CHB
for noise immunity of encoder signals. The CHA- and CHB- inputs are
optional.
Auxiliary Encoder, Aux A+,
Aux B+, Aux I+, Aux A-, Aux
B-, Aux I-
Inputs for additional encoder. Used when an encoder on both the moto
r
and the load is required. Not available on axes configured for step
motors.
Abort A low input stops commanded motion instantly without a controlled
deceleration. Also aborts motion program.
Reset A low input resets the state of the processor to its power-on condition.
The previously saved state of the controller, along with parameter
values, and saved sequences are restored.
Forward Limit Switch When active, inhibits motion in forward direction. Also causes
execution of limit switch subroutine, #LIMSWI. The polarity of the
limit switch may be set with the CN command.
Reverse Limit Switch When active, inhibits motion in reverse direction. Also causes
execution of limit switch subroutine, #LIMSWI. The polarity of the
limit switch may be set with the CN command.
Home Switch Input for Homing (HM) and Find Edge (FE) instructions. Upon BG
following HM or FE, the motor accelerates to slew speed. A transition
on this input will cause the motor to decelerate to a stop. The polarity
of the Home Switch may be set with the CN command.
Input 1 - Input 8 isolated
Input 9 - Input 16 isolated
Input 17 - Input 24 TTL
Uncommitted inputs. May be defined by the user to trigger events.
Inputs are checked with the Conditional Jump instruction and After
Input instruction or Input Interrupt. Input 1 is latch X, Input 2 is latch
Y, Input 3 is latch Z and Input 4 is latch W if the high speed position
latch function is enabled.
Latch High speed position latch to capture axis position on occurrence of
latch signal. AL command arms latch. Input 1 is latch X, Input 2 is
latch Y, Input 3 is latch Z and Input 4 is latch W. Input 9 is latch E,
input 10 is latch F, input 11 is latch G, input 12 is latch H.