Main
Warnings, Cautions, and Notes as Used in this Publication
Warning
Caution
Preface
Content of this Manual
Related Publications
Preface
We Welcome Your Comments and Suggestions
Henry A. Konat
Section 2: Fault Detection and Control Actions 72 . . . . . . . . . . . . . . .
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1
Chapter 1Introduction
Hot Standby CPU Redundancy Product
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Features of the Hot Standby CPU Redundancy Product
Benefits of the Hot Standby CPU Redundancy Product
I/O Systems for Hot Standby CPU Redundancy Systems
Genius I/O System
Local I/O System
Cable Connections
5
Y Y
*
TERMINATED I/O CABLE
PRIMARY UNIT SECONDARY UNIT
REMOTE DROP
Figure 2. Synchronized Hot Standby CPU Redundancy System Configuration
other Genius devices
Legend
Redundancy CPU Module
Redundancy Communications Module
Bumpless Switching
Synchronized CPUs
Effect on Scan Time
Fail Wait Time
Switch to Backup Unit Time
Configurable Backup Data Size
On-Line Programming
On-Line Repair
Programming Considerations
Configuration Requirements
Definition of Terms
12 Series 90-70 Hot Standby CPU Redundancy Users Guide December 1993
Commonly Used Acronyms
2
Chapter 2System Components
Redundancy CPU
Figure 3. CPU 780 Locations in a Hot Standby CPU Redundancy System
Table 1. Capacities for Redundancy CPU, IC697CPU780
CPU Architecture
Caution
Watchdog Timer
15
CPU Features
Figure 4. Redundancy CPU - IC697CPU 780
OK RUN ENABLED MEM PROTECT CENTRAL PROCESSOR UNIT
CPU 780
CPU Mode Switch
Table 2. Valid Operating Mode Selection
Run/Outputs Enabled
Run/Outputs Disabled
STOP
Memory Protect Keyswitch
CPU Status LEDs
OK
RUN
ENABLED
Serial Port Connector
Expansion Memory Board
Table 3. Expansion Memory Boards for CPU 780
19
Redundancy Communications Module
Figure 5. Redundancy Communications Module - IC697RCM711
RCM Features
The following figure shows the features of the RCM module.
RCM 711
RCM System Status LEDS
BOARD OK
LOCAL SYSTEM READY
LOCAL SYSTEM ACTIVE
REMOTE SYSTEM READY
Unit Selection Pushbutton
RCM Connectors
Bus Transmitter Module
Module OK
Programmer Port Enabled
Expansion Port Enabled
BTM Connectors
Bus Receiver Module
I/O Bus Signal Termination
LED Status Indicators
Board OK
Last Rack
Genius Bus Controller
Genius Bus Controller User Features
Module OK
CH 1 OK
GBC Connectors
Figure 7. Example of Multiple Genius Busses in a Hot Standby CPU Redundancy System
Racks
3
Chapter 3Configuration
Configuring a Hot Standby CPU Redundancy System
Redundancy System Requirements
Basic Redundancy System Setup
Logicmaster 90 Configuration
For both Primary and Secondary CPUs, do the F ollowing:
I/O System Configuration
Screens for Fault Category Configuration
Handling Folders
Configuration with Logicmaster 90-70
Configuration of a Redundancy CPU Module
Page
Redundant CPU Requirements
Redund Type
Background Window
Normal Sweep Mode
Constant Window Sweep Mode
Constant Sweep Mode
Ctrl Strgy
Fail Wait
Shared I/O
37
Table 4. Shared I/O Data Parameters
Transfer Data Size
Table 6. Transfer Data Size
Interrupts
Configuring a CPU Expansion Memory Board
Configuration of a Redundancy Communications Module
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Configuration of a Genius Bus Controller
Paired GBC Parameter
Serial Bus Address
Configuring a Primary Redundant PLC
Select the Redundancy CPU Module
Select an Expansion Memory Board
Configure the Redundant Communications Module
Configure a Genius Bus Controller
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Configure Genius I/O Blocks
Configure the Bus Transmitter Module
Configuring a Secondary Redundant PLC
Change Redund Type
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4
Chapter 4Operation
Section 5: System Operation Power-Up Sequence of a Redundant CPU
Incompatible Configurations
Resynchronization of the Redundant CPU
Hot-Standby Redundancy Control Strategy
Synchronous Scan
Figure 8. Active and Backup Sweeps
First Data Transfer %I, %AI and Synchronization
Data Transfer from Backup Unit to Active Unit
Second Data Transfer %Q, %AQ, %R, and %M
Switching Control to Backup Unit
Role Switch SVCREQ
%S References for CPU Redundancy
Table 7. Definition for% S Reference for Redundancy Status
Redundancy CPU Considerations
Features not Available with CPU 780 I/O Interrupts
Timed Interrupts
VME Integrator Racks
STOP/IOSCAN Mode
Differences in Operation for CPU 780
RUN Disabled Mode
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Configuration of Fault Actions
STOP to RUN Mode Transition
Background Window Time
Background User Checksum and Background Window Timing Instructions
Miscellaneous Operation Information Timer and PID Function Blocks
Timed Contacts
OVR_PRE %S Reference
Genius Bus Controller Switching
Section 6: Fault Detection and Control Actions
Fault Detection
Fault Categories
Changing Fault Category Actions
74 Series 90-70 Hot Standby CPU Redundancy Users Guide December 1993
PLC Fault Table
Table 8. Fault Zoom Help Text for Redundancy Error Codes
Error Code Message Fault Description Corrective Action
Faulting RCMs, Losing Links, and Terminating Communications
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Fault Actions in a CPU Redundancy System
Table 9. Maskable Fault Group Descriptions
Table 10. Maskable Fault Group Actions
79
Table 11. Non-Maskable Fault Group Descriptions
Fault Group Table
Type Description
Table 12. Non-Maskable Fault Action Descriptions
Fault Actions Fault Group Simplex Mode Redundant Mode
On-Line Repair
Maintaining Parallel Bus Termination
On-Line Repair Recommendations
Power Supply
Racks
Central Processor Unit
Redundancy Communications Module and Cables
Redundancy Communications Link Failures
Bus Transmitter Module
Genius Bus Controller
Genius Bus
Genius Blocks
A
Appendix ARedundancy Alternatives
Redundancy Alternatives
Note that the redundancy option described in this manual is the Hot Standby Product.
86 Series 90-70 Hot Standby CPU Redundancy Users Guide - December 1993
Figure 9. Guide to Selection of Redundancy Option Key for Table 1 (Redundancy Options)
Redundancy Option Key (see Table 1)
Fault Tolerant
Fail Safe
Use This Guide to Select the Redundancy Option Key for the Available Redundancy Options
Table 13. Redundancy Options
See list of restrictions below.
Explanation of terms used in the above Table of Redundancy Options.
Series 90-70 Redundancy Through Application Logic
A
B
C
D
E
F
G
H
I
K
L
M
P
R
S
T
W