Rockwell Automation 4100 ALEC AXIS LINK ENCODER CONVERTER - Manual (Page 29)

Publication 4100-5.3 - June 1999
Installation & Hook-Up 21
Figure 2.6 Current-sourcing Registration Sensor
The connections shown in the figures are typical. Since input devices
vary in their specific connection, please consult the wiring diagram for
your registration device to determine the exact connections.
Using the Registration Input
Since the registration input is used to latch axis position within
1 micro
second, it employs a fast optocoupler and is not filtered for
switch bounce. In applications which use a similarly fast registration
sensor, this is not usually a problem. However, in some applications,
the fast response and lack of filtering mean that extra precautions
must be taken.
Since the registration input is
−
and has to be
−
sensitive because of its
function, it is best to treat it not like a discrete input but as you would
treat a sensitive analog input. The registration input is floating (not
referenced to any common) and is thus similar to a differential servo
amplifier or encoder input. As with a servo amplifier or encoder input,
best results are obtained by using shielded twisted-pair cable for all
registration wiring as shown previously.
The registration input current is 2.5mA when the input is activated.
While this is a reasonable current for most 5V devices (the marker
channel on an encoder for instance), it is low for typical 24V devices,
5V
24V
-
*Use 5V terminal and 5V power supply for 5V sensors.
Use 24V terminal and 24V power supply for 24V sensors.
Recommended cable is Belden 9501 or equivalent.
* Supply
Output
Common
Power
Supply
−
+
Current-sourcing
Registration
Sensor