Rockwell Automation 1756-RIO ControlLogix Remote I/O Communication Interface Module User Manual - Manual (Page 165)

Publication 1756-UM534B-EN-P - November 2010 165
Troubleshooting Display and Status Indicators Appendix D
Watchdog and Jabber Inhibit
A watchdog timer is implemented in the module’s hardware. If the firmware
does not kick the watchdog within the time-out period, the watchdog times
out and generates a fatal error with error code D1. In scanner mode, the
module stops scanning. In adapter mode, all racks stop communication.
A jabber inhibit timer is implemented in the module’s hardware. If the network
transmitter is on longer than 150% of the longest network frame time, the
jabber inhibit forces the transmitter off and generates a fatal error with error
code D0.
In scanner mode, the module stops scanning. In adapter mode, the module
stops communicating on the back plane and Remote I/O network.
Updating the Firmware
The module firmware updates using the scanner or adapter configuration
program. To update the firmware, in the configuration tool, from the Tools
menu, choose Set 1756-RIO Scanner/Adapter Mode. Setting the mode loads
the latest firmware onto the module.