AMCI SD4840EK, User Manual

Page: 16 / 104

I
NTRODUCTION TO THE
SD4840EK
SD4840EK User Manual
ADVANCED MICRO CONTROLS INC.
16
I/O Connector
As shown in figure R1.1, the I/O connector is located on the top of the
module. All digital I/O connections are made at this connector as well
as the power supply connections. The mating connector is supplied
with the SD4840EK and is also available from AMCI under the part
number MS-2X11. It is also available from Phoenix Contact under
their part number 173 88 98.
Available Discrete Inputs
The SD4840EK has three discrete DC inputs that accept 3.5 to 27 Vdc
signals. (5 to 24 Vdc nominal) They can be wired as differential, sink-
ing, or sourcing inputs. How the SD4840EK uses these inputs is fully
programmable as is their active states. (Inputs can be programmed as
Normally Open (NO) or Normally Closed (NC) inputs.)
Home Input
Many applications require that the machine be brought to a known
position before normal operation can begin. This is commonly called
“homing” the machine or bringing the machine to its “home” position.
The SD4840EK allows you to define this starting position in three
ways. The first is with a Position Preset Command. The second is with
a sensor mounted on the machine. When you define one of the inputs
as the Home Input, you can issue commands to the SD4840EK that
will cause the unit to seek this sensor. The third option is homing to
the Z pulse of a quadrature encoder. When using the Z pulse, you can
use one of the inputs or a network data bit as a home proximity sensor.
How the SD4840EK actually finds the Home sensor is described in
chapter 4,
Homing the SD4840EK
, starting on page 49.
CW Limit Switch or CCW Limit Switch
Each input can be defined as a CW or CCW Limit Switch. When configured this way, the inputs are used to
define the limits of mechanical travel. For example, if you are moving in a clockwise direction and the CW
Limit Switch activates, all motion will immediately stop. At this point, you will only be able to move in the
counter-clockwise direction.
Start Indexer Move Input
Indexer Moves are programmed through the Network Data like every other move. The only difference is that
Indexer Moves are not run until an input that is configured as a Start Indexer Move Input makes an inactive-
to-active state transition. This allows the SD4840EK to run critically timed moves that cannot be reliably
started from the network due to data transfer lags.
If the quadrature encoder is enabled and one of the discrete DC inputs is programmed as a Start Indexer Move
Input, then the quadrature encoder position data will be captured whenever the DC input makes a transition.
An inactive-to-active state transition on the DC input will also trigger an Indexer Move if one is pending.
Emergency Stop Input
When an input is defined as an Emergency Stop, or E-Stop Input, motion will immediately stop when this
input becomes active. The driver remains enabled and power is supplied to the motor. No move can begin
while this input is active.
Figure R1.1 I/O Connector
+Vdc Main
+Vdc Auxiliary
GND
– Output 1
+ Output 1
– Input 3
+ Input 3
– Input 2
+ Input 2
– Input 1
+ Input 1
+Vdc Main
+Vdc Auxiliary
GND
No Connection
– Z Encoder
+ Z Encoder
– B Encoder
+ B Encoder
– A Encoder
+ A Encoder
No Connection