Flowserve MX/QX Profibus DP/PA Field Unit Manual de usuario descargar pdf (Pagina 70)

PB DPV1 / PA Field Unit Installation and Maintenance FCD LMENIM2336-03 – 12/12

Status Bit Deﬁnitions

Reprinted from “PROFIBUS-PA Proﬁle for Process Control Devices, Version 3.0.”

Value & Status – Floating Point Structure

This data structure consists of the values and the state of the Floating Point parameters. These

parameters can be inputs or outputs.

Data Type Value & Status – Floating Point

Key Attribute Index = 33

Attribute: Number of Elements = 2

Attribute: List of Elements (shown below)

E Element Name Data Type (Index) Size

1 Value Float - (8) 4

2 Status Unsigned 8 - (5) 1

Coding of status

The deﬁnition of status attribute is the same for all parameters (input, output, and contained). There

are four states of quality of the data, an enumerated set of sixteen sub-status values for each quality,

and four states of limits placed on the data. Limit information is generated for all status attributes of

all parameters having status. Quality bit #7 and #6 (for cascade mode) must be set to “good” in the

second word of the data message while writing to AO and DO function blocks. See coding structure

below for details.

Quality Quality Substatus Limits

Gr Gr QS QS QS QS Qu Qu

0 0 = bad

0 1 = uncertain

1 0 = good (Not Cascade)

1 1 = good (Cascade)

Meaning at = bad

0 0 0 0 0 0 = non-speciﬁc

0 0 0 0 0 1 = conﬁguration error

0 0 0 0 1 0 = not connected

0 0 0 0 1 1 = device failure

0 0 0 1 0 0 = sensor failure

0 0 0 1 0 1 = no communication (last usable value)

0 0 0 1 1 0 = no communication (no usable value)

0 0 0 1 1 1 = out of service

Meaning at = uncertain

0 1 0 0 0 0 = non-speciﬁc

0 1 0 0 0 1 = last usable value

0 1 0 0 1 0 = substitute-set

0 1 0 0 1 1 = initial value

0 1 0 1 0 0 = sensor conversion not accurate

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 87 88

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Flowserve MX/QX Profibus DP/PA Field Unit Manual de usuario Pagina 70