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CIP Axis Attributes
Chapter 4
Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018
247
See also
Motion Control Axis Behavior Model
These are the event related attributes associated with a Motion Control Axis.
These include registration, marker, and homing events. The Event Capture
attributes are designed to support the possibility of up to 7 active events per
controller update period. The basis for all Time Stamp attributes is absolute
System Time and follows the CIP Sync standard with 0 corresponding to January
1, 1970. Within the Logix controller, the System Time for event time stamps are
converted to the local CST by applying the local System Time Offset to the event
time stamp. In general, these event related attributes are only applicable when
there is an associated position feedback device; if the axis is configured for
Encoderless or Sensorless operation, the event functionality is not applicable.
The Motion Control Axis supports two independent registration input channels
per device axis instance that can be triggered on either the rising or falling edges of
the signal. If the device hardware implementation allows, event time and position
data can be captured for all four event conditions simultaneously. The Event
Capture attributes also support Auto-rearm for registration events. This allows for
controller implementation of important features like Windowed Registration and
Registration Pattern Recognition.
The Motion Control Axis also supports Home Switch, Marker and
Switch-Marker events for homing functionality on a per axis basis. The Marker
events are typically generated by the configured position feedback device for the
associated device axis.
Registration Inputs
Usage
Access
T Data
Type
Default
Min
Max
Semantics of Values
Required - E
Set/GSV
USINT
0
0
10
The Registration Inputs attribute determines the number of Registration Inputs
supported by this device axis instance. Maximum value is determined by drive
device profile.
Registration 1 Positive Edge Position
Usage
Access
T Data
Type
Default
Min
Max
Semantics of Values
Required - E
Get/GSV
T REAL
-
-
-
Position Units
Event Capture Attributes