Chapter 4
CIP Axis Attributes
298
Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018
Module Fault Bits
Usage
Access
T Data Type Default
Min
Max
Semantics of Values
Required - All
Get/GSV
T DWORD
-
-
-
Bitmap
0 = Control Sync Fault
1 = Module Sync Fault
2 = Timer Event Fault
3 = Module Hard Fault
4 = Reserved
5 = Reserved
6 = Reserved
7 = Conn. Format Fault
8 = Local Mode Fault
9 = CPU Watchdog Fault
10 = Clock Jitter Fault
11 = Cyclic Read Fault
12 = Cyclic Write Fault
13 = Clock Skew Fault
14 = Control Conn. Fault
15 = Reserved
16 = Module Clock Sync Fault
17 = Logic Watchdog
18 = Duplicate Address
19...31 = Reserved
This bit field is a roll-up of module scoped fault conditions that can include
synchronization faults detected on either side of the CIP Motion connection. All
defined Node Fault Codes are mapped into bits in this attribute. The controller
generally applies a shutdown fault action when a Module Fault occurs and
recovery generally requires module reconnection or reconfiguration.
The following table defines a list of conditions associated with the Module Fault
Bits attributes. While the Module Fault 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.
Bit
Module Fault
Name
Device Node Fault
Name
Description
0
Control Sync Fault
-
The Control Sync Fault bit attribute is set when the Logix
controller detects that several consecutive connection
updates from the motion module have been missed. This
condition results in the automatic shutdown of the
associated motion module. The Logix controller is
designed to "ride-through" a maximum of four missed
position updates without issuing a fault or adversely
impacting motion in progress. Missing more than four
position updates in a row constitutes a problematic
condition that warrants shutdown of the motion module.
This bit is cleared when the connection is reestablished.