ABB Advant Controller 450 User Manual

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Data Sets (DS) are used with signal exchange between, for example, controllers. A Data Set is
defined by a data base element which states if it is a transmitting or receiving Data Set, the cycle
time and from where the information is received or to where it is transmitted. The data base
element for a Data Set also refers to a number of DAT elements. These DAT elements contain,
in turn, the values which are to be transmitted/received.
When a DS and associated DAT elements are allocated names, it is important to be able to trace
the origin of the data, that is, where the data originates. One way is to give a Data Set a name in
accordance with DS “from node number” - “to node number”. If a Data Set is transmitted from
node 12 to node 11, it is given the name DS12-11. Associated DAT elements can be given the
name DS12-11.R1 (which is obtained automatically if a real DAT element is created with the
help of DS).
As an alternative, you can give DAT elements function-describing names (of up to 12
characters).
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Information given in Section 3.2, Technical Data Including Capacity & Performance shows that
receiving Data Sets generate more load than transmitting Data Sets. To minimize the load, you
can create data base elements for receiving Data Sets in an Advant Controller 450 before
transmitting. Place data base elements for the Data Set which receives data most frequently at
the beginning. If, despite the above actions, there are load problems in the controller or on the
bus, you can transmit data event-controlled. Use the PC element SENDREQ for this. You can
use the “VALID” flag on the data base element for a receiving Data Set and the DAT element as
a “Fresh data available” flag.
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For the available general function block library included in the basic system program and
different additional system programs, see Section 1.7, Product Overview.
You are also referred to information regarding necessary hardware and software given in other
sections in this chapter. These sections are more focused on concrete functions.
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The controller data base is the normal interface to the application program.
For example, there are different data base elements representing process interface such as
Analog Input, Digital Output, and so on.

ABB Advant Controller 450 Specifications

General

Brand	ABB
Model	Advant Controller 450
Category	Controller
Language	English