Filter
Top Products
GFK-1527A 3-1
Configuration Requirements
This chapter defines the special configuration requirements of an Enhanced Hot Standby CPU
Redundancy system.
Programmer Connection for Configuration
In a Hot Standby CPU Redundancy system, one CPU is configured as the Primary CPU and the
other as the Secondary CPU. The Primary Unit and the Secondary Unit must be configured
separately. The programming device must be connected directly to either the Primary or the
Secondary Unit to configure that unit. For a new system, STORE configuration first, then logic.
C
P
U
C
P
U
B
T
M
R
C
M
G
B
C
30
Secondary Unit Primary Unit
31
P
S
P
S
B
T
M
R
C
M
G
B
C
Genius Bus
To Pro
g
rammer
One Application Program in Both PLCs
Although it is not necessary to use the same application program logic for both PLCs, it is difficult
to maintain a system that uses two different programs. If the programs are not the same, logic
changes made in one system must be hand-keyed into the program folder for the other PLC. Other
than visual inspection, there is no way to tell if changes made in one system have been
appropriately made in the other.
Program Folders in Control Programming Software
With the Control programming software, a single folder may be used if the logic is identical for
both CPUs.
3
Chapter