Emerson Rosemount 2460 System Hub Reference Manual page 94

Configuration
October 2018
Table 4-10. Redundancy configuration
Item
Primary Device ID
Backup Device ID
Redundancy Status
Manual switch over
Configuration
Unpair
Table 4-11. Configuration
Item
Common Modbus Address
Specific Modbus Address for
Primary Device /
Specific Modbus Address for
Backup Device
Passive device responds on
common address
Max Fail-Overs per Hour
Fail-over criteria
Take-over criteria
82
Description
Each device has a unique identification number.
If status is OK, a green check box is displayed. You may expand the Status list to
view further details. In case status is not OK, a list of warnings and errors will be
displayed.
Active/Passive mode can be changed manually. The Active device
communicates with the host system and responds to requests for
measurement data, status information, and diagnostics. This option can be
useful for testing that both system hubs function properly as Active and
Passive.
See Table 4-11 below.
It is possible to un-pair the two devices in the redundancy system. When
un-pairing the redundant system hubs, the active device will change mode to
standalone. The passive device will load the default configuration database and
the default Modbus address (245) to make sure it will not disturb
communication on Host and Field ports after unpairing the system hubs.
Description
Common Modbus address is the standard setting. Primary and Backup system
hubs use the same Modbus address.You may use this option in case Primary
and Backup system hubs are connected to different host ports. Then the same
Modbus address can be used instead of individual addresses.
The redundant system hubs can be given individual Modbus addresses in case
you need to be able to communicate separately with each system hub.
useful, for example, for verifying the current status of each device.
See "Passive device communication" on page
Maximum number of fail-overs per hour in order to prevent an oscillating
behavior i.e. switching back and forth between Primary and Backup device. In
case fail-overs tend to occur frequently, the reason behind should be
investigated and fixed.
See Table 4-9 on page 78.
See "Take-over criteria" on page
Reference Manual
00809-0100-2460, Rev DE
79.
79.
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Configuration