Wika DPT-10 Bedienungsanleitung PDF herunterladen (Seite 87)

The status byte corresponds to proﬁle 3.0 "Proﬁbus PA Proﬁle for Process Control Devices" coded.

The status "Measured value OK" is coded as 80 (hex) (Bit7 = 1, Bit6 … 0 = 0).

The measured value is transferred as a 32 bit ﬂoating point number in the IEEE-754 format.

Byte n

Byte n+1

Bit

Exponent

Bit

Sign

Bit

Significant

6 5

2 1

-1

-2

-3

-4

-5

-6 -7

Byte n+2

Byte n+3

Bit

Significant

Bit

Significant

-9

-10 -11

-12

-13

-14 -15

-16

-17

-18

-19

-20

-21

-22

-23

-8

Value = (-1)

(Exponent - 127)

(1 + Significant)

Fig. 58: Data format of the measured value

Coding of the status byte associated with the PA output value

Status

code

Description according to Pro-

ﬁbus standard

Possible cause

0x00 bad - non-speciﬁc Flash-Update active

0x04 bad - conﬁguration error l Adjustment error

l Conﬁguration error with PV-Scale (PV-Span too small)

l Unit irregularity

l Error in the linearization table

0x0C bad - sensor failure l Hardware error

l Converter error

l Leakage pulse error

l Trigger error

0x10 bad - sensor failure l Measured value generation error

l Temperature measurement error

0 x 1f bad - out of service constant "Out of Service" mode switched on

0 x 44 uncertain - last unstable value Failsafe replacement value (Failsafe-Mode = "Last value" and

already valid measured value since switching on)

0 x 48 uncertain substitute set l Switch on simulation

l Failsafe replacement value (Failsafe-Mode = "Fsafe value")

0 x 4c uncertain - initial value Failsafe replacement value (Failsafe-Mode = "Last valid value" and

no valid measured value since switching on)

0 x 51 uncertain - sensor; conversion

not accurate - low limited

Sensor value < lower limit

0 x 52 uncertain - sensor; conversion

not accurate - high limited

Sensor value > upper limit

0 x 80 good (non-cascade) - OK OK

0 x 84 good (non-cascade) - active

block alarm

Static revision (FB, TB) changed (10 sec. active, after the parameter

of the static category was written)

Diﬀerential pressure transmitter DPT10 - metal measuring diaphragm • Proﬁbus PA 87

11 Supplement

37245-EN-100120

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 95 96

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