Contents
vi Series 90™-70 Enhanced Hot Standby CPU Redundancy User's Guide–May 2000 GFK-1527A
Port 2....................................................................................................................2-5
Port 3....................................................................................................................2-5
Redundancy Communications Module..........................................................................2-6
Unit Select Pushbutton..........................................................................................2-6
Connector.............................................................................................................2-7
RCM Status LEDS................................................................................................2-7
Bus Transmitter Module............................................................................................... 2-8
Connectors............................................................................................................2-8
Bus Transmitter Module Status LEDs....................................................................2-8
Bus Receiver Module....................................................................................................2-9
Connectors............................................................................................................2-9
Cables and Termination........................................................................................ 2-9
Genius Bus Controller................................................................................................ 2-10
Location of GBCs and Blocks.............................................................................2-10
Single Bus Genius Networks...............................................................................2-11
Dual Bus Genius Networks.................................................................................2-11
Connectors..........................................................................................................2-12
Bus Controller LEDs...........................................................................................2-12
Chapter 3 Configuration Requirements.......................................................................... 3-1Programmer Connection for Configuration................................................................... 3-1
One Application Program in Both PLCs........................................................................3-1
Program Folders in Control Programming Software...............................................3-1
Program Folders in Logicmaster 90.......................................................................3-2
CPU Configuration Parameters.....................................................................................3-2
Configuring Shared I/O References........................................................................3-3
Finding the Memory Available for Application Program Storage............................3-4
System Communications Window Considerations..................................................3-4
Configuring the Redundancy CPU for Non-redundant Operation.................................. 3-5
Rack Module Configuration Parameters........................................................................3-5
Bus Controller Configuration Parameters......................................................................3-5
Genius I/O Block Configuration Parameters..................................................................3-6
Chapter 4 Normal Operation...........................................................................................4-1Powerup of a Redundant CPU.......................................................................................4-2
Incompatible Configurations.........................................................................................4-3
Resynchronization of a Redundant CPU........................................................................4-3
GHS Control Strategy...................................................................................................4-4
GDB Control Strategy...................................................................................................4-4
%S References for CPU Redundancy............................................................................4-5
OVR_PRE %S Reference Not Available...............................................................4-5
Scan Synchronization................................................................................................... 4-6
Input Data and Synchronization Data Transfer to the Backup Unit................................4-6
Sweep Time Synchronization................................................................................4-6
Output Data Transfer to the Backup Unit...................................................................... 4-7
Data Transfer Time.......................................................................................................4-8