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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
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.
Содержание Advant Controller 450
Страница 1: ...Advant OCS with Master software GYDQW RQWUROOHU User s Guide 3BSE 002 415R701 Rev A ...
Страница 26: ...Advant Controller 450 User s Guide Table of Contents 3BSE 002 415R701 Rev A xvi ...
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Страница 488: ... GYDQW RQWUROOHU 8VHU V XLGH SSHQGL DUGZDUH 0RGXOHV A 48 3BSE 002 415R701 Rev A ...
Страница 496: ...Advant Controller 450 User s Guide Appendix C Delivery Documentation C 2 3BSE 002 415R701 Rev A ...
Страница 508: ...Advant Controller 450 User s Guide Appendix D Item Designations D 12 3BSE 002 415R701 Rev A ...
Страница 514: ...Advant Controller 450 User s Guide Appendix E Current Consumption and Heat Dissipation E 6 3BSE 002 415R701 Rev A ...
Страница 518: ...Advant Controller 450 User s Guide Appendix F Load Calculation F 4 3BSE 002 415R701 Rev A ...
Страница 522: ...Advant Controller 450 User s Guide Appendix G Memory Calculation G 4 3BSE 002 415R701 Rev A ...
Страница 528: ...Advant Controller 450 User s Guide Appendix H Halt Codes H 6 3BSE 002 415R701 Rev A ...
Страница 561: ...Advant Controller 450 User s Guide Index 3BSE 002 415R701 Rev A iii V Valve control 1 102 VT100 terminal 1 105 ...
Страница 562: ...Advant Controller 450 User s Guide Index iv 3BSE 002 415R701 Rev A ...
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Страница 564: ...3BSE 002 415R701 Rev A March 2000 ...