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Index-2 Series 90™-70 Enhanced Hot Standby CPU Redundancy User's Guide–May 2000 GFK-1527A
E
Enhanced Hot Standby CPU Redundancy
basic operation, 1-9
CPU features, 1-3
CPU version, 1-3
defined, 1-2
required modules, 1-2
Error checking, 2-3
Ethernet controller
configuring communications window, 3-4
Ethernet Global Data
enhanced for redundancy CPUs, 1-4
in a Redundancy system, 4-24
Event-triggered programs
not available with Redundancy CPUs, 1-4
F
Fail Wait time, 4-8
Fault actions, 5-7
configuration, 5-1
configured differently for redundancy CPUs, 1-4
Fault detection, 5-2
Fault messages for redundancy, 5-3
Fault response, 5-5
Faults
configurable, 5-8
non configurable, 5-9
FIP products
not supported with Redundancy CPUs, 1-4
Flash operation
not available with Redundancy CPUs, 1-4
G
GDB Control Strategy
description, 4-4
example system illustrated, 1-11
I/O block configuration, 3-6
output control, 1-9
output data transfer necessary, 2-11
Run disabled mode, 4-18
summarized, 1-8
Genius blocks
configuring, 3-6
installing on same end of bus, 2-10
Genius Dual Bus. See GDB Control Strategy
Genius Hot Standby. See GHS Control
Strategy
GHS Control Strategy
compatibility, 1-8
description, 4-4
example system illustrated, 1-10
I/O block configuration, 3-6
output control, 1-9
output data transfer not necessary, 2-11
Run disabled mode, 4-15
summarized, 1-8
H
Hot Standby
defined, 1-1
I
I/O scan sets, 4-21
configuration, of, 4-21
I/O systems
summary description, 1-5
Input data transfer, 4-6
Interrupts
cannot be configured, 3-5
not available with Redundancy CPUs, 1-4
K
Keyswitch
memory protect, 2-4
L
LEDs
Bus Receiver Module, 2-9
Bus Transmitter Module, 2-8
CPU, 2-4
Genius Bus Controller, 2-12
Redundancy Communications Module, 2-7
Links
losing, 5-6
Local I/O
in PLC system but not redundant, 1-6
Local system
defined, for Redundancy Communications
Module, 2-7
M
Memory
1 Megabyte user memory, 2-3
512K Bytes user memory, 2-3
available for program storage, 3-4
expansion, 2-3
Microcycle mode
not available with Redundancy CPUs, 1-4
Mode switch
CPU, 2-5
Multi-drop cable, A-1
configuration, A-2
purpose, A-1