Accelnet Plus Micro Modules User Guide
16-01687 Rev 03
Copley Controls
Page 130 of 139
D
IGITAL
I
NPUTS
Digital
I
NPUTS
All of the drives feature 7 programmable digital inputs. IN1~6 are high-speed 3.3 V Schmitt
triggers. IN7 is a 5.0 V Schmitt trigger. All are +6 Vdc tolerant and all have 100 ns RC filters.
D
EBOUNCE
T
IME
To prevent undesired multiple triggering caused by switch bounce upon switch closures, each
input can be programmed with a debounce time. The programmed time specifies how long an
input must remain stable at a new state before the drive recognizes the state. The debounce
time is ignored if the input is used as a digital command input.
L
IMIT
S
WITCHES
U
SE
D
IGITAL
I
NPUTS TO
C
ONNECT
L
IMIT
S
WITCHES
Limit switches help protect the motion system from unintended travel to the mechanical limits.
With the drive operating as a CAN or EtherCAT node, an input can also be programmed as a
home limit switch for homing operations over the network.
D
IAGRAM
:
S
AMPLE
P
LACEMENT OF
L
IMIT
S
WITCHES
The following diagram shows these limit switches in use on a sample motion stage.
H
OW THE
D
RIVE
R
ESPONDS TO
L
IMIT
S
WITCH
A
CTIVATION
The drive stops any motion in the direction of an active limit switch, as described below. The
response is identical in current and velocity modes, and slightly different in position mode.
Mode
Drive Response to Active Positive (or Negative) Limit Switch
Current
Drive prohibits travel in positive (or negative) direction.
Travel in the opposite direction is still allowed.
Drive status indicator flashes green at fast rate.
Warning is displayed on CME Control Panel and CME Control Panel limit indicator turns red.
Velocity
Position
Drive stops responding to position commands until the drive is disabled and re-enabled, or the
fault is cleared over the CANopen interface.
Drive status indicator flashes green at fast rate.
Warning is displayed on CME Control Panel and CME Control Panel limit indicator turns red.
Default behavior: If, after re-enabling the amp, the limit switch is still active, the drive will only
allow movement in the opposite direction.
“ old position” behavior: If the
*Hold position when limit switch is active option is set, the drive
prevents any motion while a limit switch is active.
CAUTION: If the drive is switched back to current or velocity mode with this option selected,
the limit switches will no longer function.
For more information on *Hold position when limit switch is active, see the CME User Guide.
Mechanical Limits of Motion Stage
Negative
Limit
Sw itch
Positive
Limit
Sw itch
Home
Sw itch