SMD17E2 SPECIFICATIONS
SMD17E2 User Manual
ADVANCED MICRO CONTROLS INC.
18
Available Discrete Inputs (continued)
Stop Jog or Registration Move Input
When an input is configured as a Stop Jog or Registration Move Input, triggering this input during a Jog
Move or Registration Move will bring the move to a controlled stop. The controlled stop is triggered on an
inactive-to-active state change on the input. Only Jog Moves and Registration Moves can be stopped this
way, all other moves ignore this input.
If the unit was order with an integral encoder, the encoder position data will be captured when the DC input
makes an inactive-to-active transition if it is configured as a Stop Jog or Registration Move Input. The
encoder position data is not captured if a Jog or Registration Move is not in progress. If you want to capture
encoder position data on every transition of a DC input, configure it as a Start Indexer Move Input.
Capture Encoder Position Input
As described in the Start Indexer Move Input and Stop Jog or Registration Move Input sections above, an
SMD17E2 can be configured to capture the encoder position value on a transition of a discrete DC input.
General Purpose Input
If your application does not require one or both of the inputs, you can configure the unused inputs as General
Purpose Inputs. The inputs are not used by the SMD17E2, but their on/off state is reported in the network data
and is available to your host controller.
Optional Encoder
The SMD17E2 can be ordered with an integral encoder. An input can be configured to capture the encoder
value when the input makes an inactive to active transition. This captured value is written to the host control
-
ler. Two encoder options are available:
Incremental Encoder
The incremental encoder can be programmed to 1,024, 2,048, or 4,096 counts per turn. The SMD23/4E2 has
an internal thirty-two bit counter associated with the encoder. The incremental encoder are primarily used for
position verification and stall detection.
Absolute Multi-turn Encoder
The absolute encoder has a fixed resolution of 2,048 counts per turn. The absolute encoder is a multi-turn
device that encodes a total of 2
21
turns, yielding a full thirty-two bits of position resolution. The absolute
encoder can be used for position verification and stall detection, but its primary advantage is that it eliminates
the need to home the axis after cycling power to the drive.
Like many intelligent absolute encoders on the market today, the absolute encoder in the SMD17E2 uses
a battery backed circuit to count zero crossings while power is removed from the rest of the device. The
circuit will accurately track position as long as the shaft acceleration is limited to 160,000 degrees/sec
2
,
(444.4 rev/sec
2
), or less. Battery life is a minimum of 10 years in the absence of power. The battery cannot
be replaced in the field.
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