Index

E

Enhanced Hot Standby CPU Redundancy

basic operation, 1-9CPU features, 1-3CPU version, 1-3defined, 1-2required modules, 1-2

Error checking, 2-3

Ethernet controller

configuring communications window, 3-4

Ethernet Global Data

enhanced for redundancy CPUs, 1-4in 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, 5-8non 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, 1-11I/O block configuration, 3-6output control, 1-9

output data transfer necessary, 2-11Run disabled mode, 4-18summarized, 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, 1-8description, 4-4

example system illustrated, 1-10I/O block configuration, 3-6

output control, 1-9

output data transfer not necessary, 2-11Run disabled mode, 4-15summarized, 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, 2-3available for program storage, 3-4expansion, 2-3

Microcycle mode

not available with Redundancy CPUs, 1-4

Mode switch

CPU, 2-5

Multi-drop cable, A-1

configuration, A-2purpose, A-1

Index-2

Series 90™-70 Enhanced Hot Standby CPU Redundancy User's Guide–May 2000

GFK-1527A

Page 83
Image 83
GE 90-70 manual Index