Rockwell Automation 1794 FLEX I/O System with ControlLogix for SIL2 - Manual (Page 20)

Publication 1794-RM001G-EN-P - December 2011
2-2 ControlLogix Communications
EtherNet/IP Cabling
802.3 compliant shielded or unshielded twisted pair cable is required for
EtherNet/IP.
EtherNet/IP Module Diagnostic Coverage
Communications over 10/100 MbpsNet media occur via CIP, which
guarantees delivery of the data. All modules independently verify proper
transmission of the data.
Module Fault Reporting for
any FLEX I/O Module To monitor the connection status for this type of connection, use a Get
System Value (GSV) and an examination of MODULE objects’ "Entry Status"
attribute for a running connection.
An example of how this might be done is shown in Figure 2.1. This method,
or something similiar, must be used to interrogate the health of each I/O
module in the system.
Figure 2.1 Example of Checking a Module’s Health in Ladder Logic
For more information on the GSV instruction, monitor the SlotStatusBits for
the Input tag of the associated adapter. The lower 8 bits of this tag correspond
to the associated slot. For example, the tag "Node3:I.SlotlStatusBits" is defined
as follows:
NODE3 - This is the name given to the associated 1794-AVNR15.
I = This indicates the Input file.
GSV
Obtain MODULE
Object’s Entry Status
AND
Mask Off Lower 12
Bits of Value
NEQ
Check Entry Status to
make sure module is
running
Fault