Wika T53 Uživatelský manuál stáhnout pdf (Strana 29)

Equations:

FIELD_VAL = 100*(channel value - EU@0%) / (EU@100% - EU@0%) [XD_SCALE]

Direct: PV = channel value

Indirect: PV = (FIELD_VAL/100) * (EU@100% - EU@0%) + EU@0% [OUT_SCALE]

Ind Sqr Root: PV = sqrt(FIELD_VAL/100) * (EU@100% - EU@0%) + EU@0% [OUT_SCALE]

3.5 Supported Modes

O/S, Man and Auto.

3.6 To enable the Simulation mode

The hardware lock for the simulation mode is a reed switch

mounted in the T53 transmitter. The reed switch can be activat

ed with a special designed magnet which is mounted on the bus

connection terminals pin no. 1 and pin no. 2. Magnet type no.

12557596 can be ordered at WIKA.

3.7 Alarm Types

Standard block alarm plus standard HI_HI, HI, LO, and LO_LO alarms applied to OUT.

3.8 Mode Handling

Standard transition in and out of O/S.

Standard transition from Man to Auto and back.

3.9 Status Handling

The status values described in Output Parameter Formal Model of Part 1 apply, with the ex

ception of the control sub-status values. The Uncertain - EU Range Violation status is always

set if the OUT value exceeds the OUT_SCALE range, and no worse condition exists. The fol

lowing options from STATUS_OPTS apply, where Limited refers to the sensor limits:

Propagate Fault Forward

Uncertain if Limited

BAD if Limited

Uncertain if Man mode

3.10 Initialisation

The PV filter must be initialised, but other than that, no special initialisation is required. This

is a pure calculation algorithm.

3.11 Analogue Input Blocks Parameter List, Fieldbus Foundation

Parameter

Rel.

Index

Description Type Store

Size

byte

RO /

R/W

Min Max Default

ST_REV

The revision level of the static data associated with the func

tion block. To support tracking changes in static parameter

attributes, the associated block’s static revision parameter will

be incremented each time a static parameter attribute value is

changed. Also, the associated block’s static revision parameter

may be incremented if a static parameter attribute is written

but the value is not changed.

Un-

signed

SRC 2 RO 0

TAG_DESC

2 The user description of the intended application of the block.

Octet

String

SRC 32 R/W Spaces

STRATEGY

The strategy field can be used to identify grouping of blocks..

This data is not checked or processed by the block.

Un-

signed

SRC 2 R/W 0

ALERT_KEY

The identification number of the plant unit. This information

may be used in the host for sorting alarms, etc.

Un-

signed

SRC 1 R/W 1 255 0

MODE_BLK

5 The actual, target, permitted, and normal modes of the block. DS-69 Mix 4 *

1, 1, 25,

BLOCK_ERR

This parameter reflects the error status associated with the

hardware or software components associated with a block. It is

a bit string, so that multiple errors may be shown.

Bit

String

D 2 RO

Either the primary analog value for use in executing the func

tion, or a process value associated with it. May also be calcu

lated from the READBACK value of an AO block.

DS-65 D 5 RO

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 35 36 37

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