GE PACSystems RX7i, User Manual

Page: 68 / 276

Chapter 4. Configuration
GFK-2224Q January 2017 55
The Secondary Produced Exchange Offset parameter is available in the Ethernet Global Data properties when
redundancy is enabled and at least one produced exchange is configured to produce in backup mode. The use
of the offset is illustrated below.
Non-HSB targets have an additional Ethernet Global Data property, Redundancy Role, which appears when any
Ethernet interface in the system is configured for redundant IP operation. This parameter is used only within
the programming software and is not delivered to the PLC. The Redundancy Role parameter is not displayed for
HSB systems.
Note: It is the user’s responsibility to ensure that the same offset value is specified in both the
primary and secondary target projects.
Figure 30: Configuring Redundancy for Ethernet Global Data
Exchange ID Offset in an Ethernet Redundancy System
PME Primary Project
Produced Exchanges
EGD node
producer id = (a.b.c.d)
redundancy role = Primary
secondary offset = ofs
name = exchgX
exchange ID = X
Produce in backup = FALSE
name = exchgY
exchange ID = Y
Produce in backup = TRUE
PLC - Primary
download
to
Primary
exchange ID = X
exchange ID = Y
PLC - Secondary
exchange ID = X
exchange ID = Y + ofs
PME Secondary Project
Produced Exchanges
EGD node
name = exchgX
e xchange ID = X
Produce in backup = FALSE
name = exchgY
exchange ID = Y
Produce in backup = TRUE
producer id = (a.b.c.d)
redundancy role = Secondary
secondary offset = ofs
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to
Secondary
Figure 31: Exchange ID Offset in an Ethernet Redundancy System