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Configuration and Use Manual 137
Status Bytes Block ParametersDiagnostic BytesProLink
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 Comment
00 Bad The measurement is not useful.
01 Uncertain The quality of the measurement is below
normal, but may still be useful.
10 Good – Non-cascade The quality of the measurement is good, but
alarms may be indicated by the sub-status.
11 Good – Cascade The measurement is good.
Table D-2 Sub-status format – Bad status
Bits Meaning Comment
0011 Device failure TRUE if the following alarm codes are active:
A001, A002, A014, A029, or A030.
0100 Sensor failure TRUE if the following alarm codes are active:
A003, A004, A005, A016, or A017.
0111 Out of service See the profile specification for details.