GE 90-70 manual Contents

Contents

Chapter 1	Introduction	1-1
	Enhanced Hot Standby CPU Redundancy	1-2
	Features of Enhanced Hot Standby CPU Redundancy	1-3
	Using the Redundancy CPU for Non-Redundant Operation	1-3
	Compatibility with CPU780	1-3
	Redundancy CPUs as Compared to Other Series 90-70 CPUs	1-4
	Features not Available with Redundancy CPUs	1-4
	Differences in Operation for Redundancy CPUs	1-4
	Components of the Enhanced Hot Standby Redundancy System	1-5
	Enhanced Redundancy CPU Module	1-5
	Redundancy Communications Module	1-5
	Redundant Racks	1-5
	I/O Systems for Enhanced Hot Standby CPU Redundancy	1-5
	Genius I/O	1-6
	Local I/O	1-6
	Cable Connections	1-6
	Enhanced Hot Standby CPU Redundancy System with Local I/O	1-7
	Control Strategies	1-8
	GHS Control Strategy	1-8
	GDB Control Strategy	1-8
	Basic Enhanced Hot Standby Operation	1-9
	Output Control with GHS	1-9
	Output Control with GDB	1-9
	Basic CPU Redundancy Setups	1-10
	Single Bus with Preferred Master: GHS Control Strategy	1-10
	Single Bus with Floating Master: GDB Control Strategy	1-11
	Dual Bus with Floating Master: GDB Control Strategy	1-12
	Duplex CPU Redundancy	1-13
	Online Programming	1-13
	On-Line Repair	1-13

Chapter 2	System Components	2-1
	System Racks	2-1
	Redundancy CPU	2-2
	Features	2-2
	CPU Architecture	2-3
	Expansion Memory Board	2-3
	Watchdog Timer	2-3
	CPU Features	2-4
	Memory Protect Keyswitch	2-4
	CPU LEDs	2-4
	Battery Connectors	2-4
	CPU Mode Switch	2-5
	Run/Outputs Enabled Mode	2-5
	Run/Outputs Disabled Mode	2-5
	Stop Mode	2-5
	Port 1	2-5

GFK-1527A v