Allen-Bradley ControlLogix Reference Manual page 300

Chapter 4 CIP Axis Attributes
300
Bit Module Fault
Name
16 Clock Sync Fault
17 Logic Watchdog
Fault
Duplicate Address
18
Fault
19-31 Reserved
Module Alarm Bits
Usage Access T
Required - All Get/GSV T
This bit field is a roll-up of module scoped alarm conditions that can include
synchronization alarms detected on either side of the CIP Motion connection. All
defined Node Alarm Codes are mapped into bits in this attribute.
The following table defines a list of conditions associated with the Module Alarm
Bits attributes. While the Module Alarm Bits attribute is marked as Required in
the CIP Motion device implementation, support for each of the individual fault
conditions therein is left Optional. In this table the terms motion module and
motion device are used synonymously.
Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018
Device Node Fault Description
Name
Clock Sync Fault The Clock Sync Fault bit indicates that the motion device's
local clock has lost synchronization with the master clock
for an extended period of time (40 to 60 seconds) during
synchronous operation. This fault condition is an
indication that the local IEEE 1588 clock has lost
synchronization with the master and was not able to
resynchronize within the allotted timeout (such as 40 to
60 seconds).
Logic Watchdog Fault The Logic Watchdog Fault bit indicates that an auxiliary
logic component (for example, FPGA, or ASIC) associated
with the device node has experienced an excessive
overload condition that has tripped the associated logic
watchdog mechanism.
The Duplicate Address Fault bit indicates that a motion
Duplicate Address Fault
device node has been detected on the network that uses
the same Node Address as this device node. For Ethernet,
this address would be the IP Address of the device.
-
Data Type Default Min
DWORD - -
Max Semantics of Values
- Bitmap
0 = Control Sync Alarm
1 = Module Sync Alarm
2 = Timer Event Alarm
3 = CPU Overload Alarm
4 = Clock Jitter Alarm
5 = Out of Range Alarm
6 = Clock Skew Alarm
7 = Clock Sync Alarm
8 = Node Address Alarm
9...31 = Reserved