705-5100-F21 datasheet(20/52 Pages) MAGNETROL

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4.0

Function Blocks

4.1

Overview

The Enhanced Eclipse Model 705 Guided Wave Radar

Level Transmitter operates on the principle of Time Domain

Reflectometry (TDR). Refer to Bulletins 57-101 and 57-600

for more detailed information on the Eclipse product family.

The Enhanced Eclipse Model 705PA is a Guided Wave

Radar (GWR) level transmitter with six PROFIBUS PA™

Blocks (one Physical Block, one Transducer Block, and four

Analog Input blocks). The idea of Function Blocks, which a

user can customize for a particular application, is a key con-

cept of fieldbus topology. Function Blocks consist of an

algorithm, inputs and outputs, and a user-defined name.

The TRANSDUCER block output is available to the net-

work through the ANALOG INPUT blocks.

The ANALOG INPUT blocks (AI) take the TRANSDUCER

block level or volume values and makes them available as an

analog value to the network. The AI blocks have scaling con-

version, filtering, and alarm functions.

4.1.1 Standard PROFIBUS

TM Block Parameters

The following are general descriptions of the parameters

common to all blocks. Additional information for a given

parameter is described later in that specific block section.

BLOCK_OBJECT: Contains the characteristics of the

block. This object applies to every block and is placed

before the first parameter.

ST_REV A read-only parameter to track changes of static

parameters in the associated block. ST_REV will be incre-

mented each time a static parameter is changed.

TAG_DESC (tag descriptor): A user-supplied description

of the block.

STRATEGY: A user-specified value that may be used in

configuration or diagnostics as a key in sorting block

information.

ALERT_KEY: A user-assigned value that may be used in

sorting alarms or events generated by a block.

TARGET_MODE: This attribute indicates what mode of

operation is desired for the block.

MODE_BLK: A structured parameter composed of the actual

mode, the normal and the permitted mode(s) of a block.

The actual mode is set by the block during its execution to

reflect the mode used during execution

The permitted mode shows which changes of the target

mode are valid for the specific block

57-645 Eclipse Guided Wave Radar Transmitter - PROFIBUS PA™

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