ABB Advant Controller 450 User Manual

Advant
®
Controller 450 User’s Guide
Section 4.1.4 Primary and Backup Processor Module
3BSE 002 415R701 Rev A 4-3
1 (AUTO):
Warm start, that is the application program is restarted.
If the controller was in the working mode CONFIGURATION, it remains in the working
mode CONFIGURATION.
If the controller was in the working mode OPERATION, it remains in the working mode
OPERATION.
2 (STOP):
Go to the working mode STOPPED.
3 (CLEAR):
Cold start, that is clear RAM (controller system configuration and application program are
erased).
The controller goes to the working mode CONFIGURATION.
4 (OFFLINE):
Go to the working mode OFFLINE.
Additional Information for Redundant Processor Modules
The position of the start mode selector also determines the allocation of the primary and backup
processor modules. See the following section, Section 4.1.4, Primary and Backup Processor
Module.
4.1.4 Primary and Backup Processor Module
Method of Selection
During initialization of a system including redundant processor modules, one of the processor
modules is automatically selected as PRIMARY, while the other becomes BACKUP.
The respective processor modules subsequently assume working modes which correspond to
those entered by means of the start mode selector on each module.
The system selects the primary unit according to the following priorities (with regard to the
switch settings):
1. 1 (AUTO)
2. 3 (CLEAR)
3. 4 (OFFLINE)
4. 2 (STOP).
The processor module whose start mode selector switch is set to 1 (AUTO) is selected as the
primary unit. If both processor modules are set to 1 (AUTO), then the left unit (seen from the
front of the subrack) is selected as the primary unit.
If neither switch is set to 1 (AUTO), the one whose switch is set to the 3 (CLEAR) position will
be primary. If both processor modules are set to 3 (CLEAR) then the left unit will be primary
unit. If no processor module’s switch is set to 1 (AUTO) or 3 (CLEAR), then the processor
module whose switch is set to 4 (OFFLINE) is chosen.
The backup unit selects its working mode in accordance with information given in the
succeeding sections.

ABB Advant Controller 450 Specifications

General

Brand	ABB
Model	Advant Controller 450
Category	Controller
Language	English