ABB Advant Controller 450 User Manual

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Communication among different computers gives rise to a load divided among the
communication link itself and the main CPU of the involved computers. This must be
considered when you design a distributed control system.
A basic rule, always relevant, is to limit the frequency of the information transfer to what is
really needed by the application. Event-controlled transfer (if possible to execute in a secure
way) is preferred to cyclic transfer.
The main CPU is always loaded by a communication. The significance depends on the actual
design. For the MasterBus 300, there are two different implementations in Advant
Controller 450. One utilizes the main CPU on the processor board and another utilizes a
dedicated slave processor on the submodule carrier. The latter represents a significantly lower
load to the main CPU (but higher cost). The same information applies to MasterBus 300E.
The variants of implementation are designated with respect to the implementation:
• MasterBus 300 (executed in main CPU).
A submodule carrier with no slave processor support is normally used (SC510).
• MasterBus 300 (executed in slave CPU).
A submodule carrier with slave processor support is used (SC520).
The application is in no way affected by the selection.
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No restrictions in location of submodule and submodule carrier in controller subrack.
Use leftover slot on a submodule carrier provided the carrier is suitable to the actual submodule,
see Table 3-7 and Guidelines below.
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• You cannot mix MasterBus 300 (executed in main CPU) and MasterBus 300 (executed in
slave CPU) within the same controller.
• From a cost viewpoint, submodule carrier SC510 is preferable.
You can use other type, SC520, however you cannot mix two Masterbus 300 (executed in
main CPU) on the same carrier SC520.
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• You cannot mix MasterBus 300 (executed in slave CPU) and MasterBus 300 (executed in
main CPU) within the same controller.
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• You cannot mix MasterBus 300E (executed in main CPU) and MasterBus 300E (executed
in slave CPU) within the same controller.
• From a cost viewpoint, submodule carrier SC510 is preferable.
You can use other type, SC520, however you cannot mix two Masterbus 300E (executed in
main CPU) on the same carrier SC520.

ABB Advant Controller 450 Specifications

General

Brand	ABB
Model	Advant Controller 450
Category	Controller
Language	English