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Ethernet Hot Standby Solution
840 USE 106 00 January 2003 165
All client/server services (I/O Scanner, Global Data, Messaging, FTP, SNMP, and
HTTP) continue to run after the switchover from the old to the new Primary NOE.
Hot Standby and
NOE Module
Functionality
The NOE 771 family provides different Ethernet services. Some services are
enabled or disabled in a Hot Standby system. The following table shows which
services are enabled and disabled.
Note: Failure of an NOE module is not a condition for the primary system to leave
the primary state.
Service NOE 771 x0 NOE 771 x1
I/O Scanning Disabled Enabled
Global Data N/A Enabled
Modbus Messaging Enabled Enabled
FTP/TFTP FTP Enabled Enabled
SNMP Enabled Enabled
HTTP Server Enabled Enabled
DHCP N/A Disabled