106 Rockwell Automation Publication 1756-UM058G-EN-P - November 2012
Chapter 5 Fast Module Features
Fault and Status Reporting
between Input Modules and
Controllers
ControlLogix fast input modules multicast fault and status data to any owner-
controller or listening controller. All input modules maintain a Module Fault
word, the highest level of fault reporting. Modules configured to use the Data
with Event connection format also maintain an Event Fault word to report on the
status of an event connection.
Table 22
lists the fault words and associated tags you can examine in program
logic to indicate when a fault or event has occurred for a fast input module.
All words are 32-bit, although only the number of bits appropriate for each
module’s density are used. For example, the 1756-IB16IF module has a Module
Fault word of 32 bits.
The following illustration offers an overview of the fault reporting process on
ControlLogix fast digital input modules.
Table 22 - Fault Words on Fast Input Modules
Word Input Tag Name Description
Module Fault I:Fault Provides fault summary reporting. Available on all digital input
modules.
Event Fault E:Fault Provides fault summary reporting. Available on all digital input
modules that use the Data with Event or Listen Only with Event
connection format.
Table 23 - Bits Set in Module Fault Word
Condition Bits Set
Communication fault All 32 bits are set to 1, regardless of the module’s density.
Module Fault Word
All Modules
Bit 31 Bit 0
A communication fault sets all 32 bits in the Module Fault word.
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