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| PRIMARY UNIT |
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| SECONDARY UNIT |
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| RACK 0 |
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| RACK 0 |
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| P | C | B | R | G | I | I | I | I | I |
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| P | C | B | R | G | I | I | I | I | I |
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| S | P | T | C | B | O | O | O | O | O |
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| S | P | T | C | B | O | O | O | O | O |
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| U | M | M | C |
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| U | M | M | C |
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| 31 |
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| 30 |
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*TERMINATED I/O CABLE
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| REMOTE DROP |
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| B |
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| B |
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| B |
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| P | S | I | I | I | I | I | I | I | I |
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| L |
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| S | C | O | O | O | O | O | O | O | O |
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| O |
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| O |
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LOCAL I/0 |
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| N |
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| K |
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CAN BE IN |
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| E |
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| R |
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RACKS |
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0 - 6 |
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| RACK 1 |
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| P | B | I |
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| S | R | O | O | O | O | O | O | O | O |
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| M |
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YRACK 6
P | B I I I I I I I I |
S | R O O O O O O O O |
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*I/O CABLE WITH
IC697CBL811 (10 FEET (3m))
IC697CBL826 (25 FEET (7.5m)
*TERMINATED I/O CABLE
Figure 1. Example of a Local I/O Configuration with Expansion Racks in a
Hot Standby CPU Redundancy System
Control Strategy
Control strategy refers to the type of redundancy alternative that may be used. For the Hot Standby CPU Redundancy product, the control strategy is referred to as Genius Hot Standby (GHS). The control strategy must be selected when configuring the system with the Logicmaster
Basic Hot Standby Operation
In a basic Genius Hot Standby CPU Redundancy system, Genius blocks receive outputs from two PLCs (Primary PLC and Secondary PLC), but they are normally controlled directly by the Genius Bus Controller at serial bus address 31 (Genius Bus Controller in the Primary PLC). If no output data is available from bus address 31 (the preferred data)
Chapter 1 Introduction | 5 |