Rockwell Automation 1794-L34 FlexLogix Controller System User Manual - Manual (Page 80)

Publication 1794-UM001G-EN-P - January 2007
80 Develop Applications
Monitor Connections If communication with a device in the I/O configuration of the
controller does not occur for 100 ms or 4 times the RPI (whichever is
less), the communication times out and the controller produces the
following warnings:
• The I/O LED on the front of the controller flashes green.
• A
shows over the I/O configuration folder and over the
device (s) that has timed out.
• A module fault code is produced, which you can access
through:
– Module Properties dialog box for the module
– GSV instruction
Determine if communication has timed out with any device
If communication times out with at least one device (module) in the
I/O configuration of the controller, the I/O LED on the front of the
controller flashes green.
• The GSV instruction gets the status of the I/O LED and stores it
in the I_O_LED tag.
• If I_O_LED equal 2, the controller has lost communication with
at least one device.
where:
I_O_LED is a DINT tag that stores the status of the I/O LED on
the front of the controller.
Determine if communication has timed out with a specific
I/O module
If communication times out with a device (module) in the I/O
configuration of the controller, the controller produces a fault code for
the module.
• The GSV instruction gets the fault code for Io_Module and stores
it in the Module_Status tag.
See:
• Logix5000 Controllers Common
Procedures Manual, 1756-PM001
• Logix5000 Controllers Design
Considerations Reference Manual,
!
Get System Value
CIP Object Class MODULE
CIP Object Name
Attribute Name LedStatus
Dest I_O_LED
GSV
Equal
Source A I_O_LED
Source B
2
EQU