ABB Advant Controller 450 User Manual

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GCOM is a data link protocol used for data exchange with the help of message passing between
external computers and Advant OCS stations/controllers. The protocol is available for VAX
computers. The following data link protocol alternatives are supported:
• IEEE 802.2 class 1 logical link control and IEEE 802.3 CSMA/CD medium access control
• CCITT recommendation X.25.2 LAPB with transmission rate 19.2 or 50 kbits/sec
• ADLP-10 (ABB Data Link Protocol), an asynchronous protocol based on ECMA 16 and
ECMA 24, with transmission rate of 9.6 kbits/sec.
You can duplicate GCOM to achieve full redundancy.
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The processor module and optional communication boards are located in a controller subrack.
This cannot accommodate any process I/O. One way you can connect such I/O is to use I/O
subracks. With an electrical bus extension the I/O subracks can be located close to the controller
subrack.
For increased availability, you can duplicate CPUs, bus extension and cables.
Figure 1-31 illustrates a bus extension comprising two I/O subracks.
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I/O subrack 1
I/O subrack 2
Controller subrack
Total length of bus extension
cable is max 12 m (39 ft).
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For redundant S100 I/O bus
duplicate CPUs, bus extenders
and cables.
The I/O bus connected to the
left CPU should be connected
to the left bus extender and
vice versa.

ABB Advant Controller 450 Specifications

General

Brand	ABB
Model	Advant Controller 450
Category	Controller
Language	English