Rockwell Automation 193-EC4 EC4 Current Monitoring Relay User Manual - Manual (Page 43)

44 Rockwell Automation Publication 193-UM011A-EN-P - September 2010
Chapter 3 Protective Trip and Warning Functions
Comm Fault Warning
The EC4 Current Monitoring Relay will indicate a Comm Fault warning if:
• No warning currently exists
• Comm Fault Warning is enabled
• The relay experiences a loss of communication
When the Comm Fault warning conditions are satisfied, the following will occur:
• The Network Status LED will blink red or become solid red
• The TRIP/WARN LED will flash an amber 10-blink pattern
• Bit 9 in Parameter 15, Warning Status, will go to “1”
• Bit 1 of Parameter 21, Device Status, will go to “1”
If a communication fault occurs and either Comm Fault Trip is not enabled or
the Pr FltState parameters are set to “Ignore”, the following will occur:
• The Network Status LED will blink red or become solid red
• The outputs will be placed in their Comm Fault
Communication Idle
Protection When a programmable controller is placed into the program mode, the execution
of its ladder program is suspended, and any connected networks go to an idle
state. If inadvertent, this can result in the loss of application control and/or
critical process diagnostic data. Rapid communication idle detection helps
minimize the potential damage due to uncontrolled or unmonitored
applications.
Comm Idle Trip
The EC4 Current Monitoring Relay will trip with a Comm Idle indication if:
• No trip currently exists
• Comm Idle protection is enabled
• The network controller that the EC4 Current Monitoring Relay is
communicating to is placed to program mode
If the relay trips on a Comm Idle, the following will occur:
• The TRIP/WARN LED will flash a red 11-blink pattern
• Bit 10 in Parameter 14, Trip Status, will go to “1”
IMPORTANT The Comm Fault State of OUT A and OUT B is defined by Parameter 67
(OUTA Dn FltState), Parameter 68 (OUTA Dn FltValue), Parameter 73
(OUTB Dn FltState), and Parameter 74 (OUTB Dn FltValue).