Appendix Dprofibus-Pa Status Byte; Overview; Classic-Mode Status Byte Format - Emerson Micro Motion 2700 Configuration And Use Manual

Appendix D
PROFIBUS-PA Status Byte
D.1

Overview

This appendix describes the status byte reported by the transmitter to a PROFIBUS host. The output
of each AI, AO, and totalizer function block is a 5-byte package: four bytes of process information
and one byte indicating measurement quality, also called the status byte. The format of the status byte
depends on whether the transmitter is configured for classic mode or condensed mode.
D.2

Classic-mode status byte format

Tables D-1 through D-6 describes the format of the status byte when the transmitter is configured for
classic mode. Refer to Section 3.7.3.6 of the PROFIBUS-PA Profile for Process Control Devices
v3.01 for more information.
Table D-1 Classic-mode status byte format
Status
bits Meaning
00 Bad
01 Uncertain
10 Good – Non-cascade
11 Good – Cascade
Table D-2 Sub-status format – Bad status
Bits Meaning
0011 Device failure
0100 Sensor failure
0111 Out of service
Configuration and Use Manual
Comment
The measurement is not useful.
The quality of the measurement is below
normal, but may still be useful.
The quality of the measurement is good, but
alarms may be indicated by the sub-status.
The measurement is good.
Comment
TRUE if the following alarm codes are active:
A001, A002, A014, A029, or A030.
TRUE if the following alarm codes are active:
A003, A004, A005, A016, or A017.
See the profile specification for details.
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