Product Details

PP865 3BSE042236R1 PP865A 3BSE042236R2 ABB Control panel touch screen display

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Processor unit redundancy is available for PM858, PM861, PM862, PM864,

PM865, PM866, PM867 and PM891. In this case, the controller contains two

processor units, each including memory for system and application software. One

unit is acting as primary, the other is backup (hot stand-by). The primary processor

unit controls the process. The backup stands by, ready to take over in case of a fault

in the primary. The changeover is done bumplessly and in less than 10 ms. During

the changeover, the process outputs are frozen.

Following a changeover, the system operates as a system without redundancy with

only one processor unit in operation. You can replace the malfunctioning processor

unit while the system is running. After the replacement is carried out, the system

once again has a redundant processor unit.

If an error arises in the backup unit, you can also replace the backup unit while the

system is running.

Errors which occur in the backup unit can never affect the primary unit's operation.

The primary unit and the backup unit are logically separated from one another.

Hardware errors in the primary processor unit cause the system to perform a correct

changeover. These hardware errors are single errors.

The application programming and the communication are totally unaffected by the

redundancy.