ABB 3HAC022195-001

ABB 3HAC022195-001

Sales Manager :Yuki  / Phone: +8617359287459

Email: sales15@amikon.cn  / Skype:+8617359287459

  PM8xx/TP830 Processor Unit – Redundancy 

Processor unit redundancy is available for PM857, PM858, PM861, PM862, PM863,
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.

E-mail : sales15@amikon.cn

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