Page 140 SITRANS LR250 (PROFIBUS PA) – INSTRUCTION MANUAL 7ML19985JF02
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G: Communications PA
Diagnostics
All diagnostic information shown below is viewable via PDM.
Diagnosis reply (available cyclically)
During DPV0 data exchange, the PROFIBUS PA slave will notify the Master when a
serious error occurs. The Master will then send a Diagnosis request. The reply to this
request is normally logged in the PLC and is referred to as the "Hex values."
The reply may contain two parts. The first part is 6 bytes long and is defined by the
PROFIBUS standard. If there is a second part, it is called the ’extended cyclic diagnosis’
and it is 8 bytes long. The last 4 bytes of the extended diagnostic message give the error
diagnosis (see
Extended Mode Diagnosis
on page 141 and
Condensed Mode Diagnosis
on page 142).
The same information is also available acyclically via the Diagnosis Object.
Condensed Status (BAD)
Hex
value
Status BAD Description
0x00 BAD – non specific
Proxy determines that a device does not
communicate.
0x23
BAD – passivated (diagnostics
alerts disabled)
Configured failsafe value is used,
accompanied by this status.
0x24
...0x27
BAD – maintenance alarm, more
diagnosis available
No measurement available because of a
failure.
0x25
BAD – process related, no mainte-
nance
No measurement available because of
invalid process conditions.
0x3C
...0x3F
BAD – function check / local over-
ride, value not usable
Occurs during cleaning or calibration
process.
Cyclic Diagnosis (6 bytes) Extended Cyclic Diagnosis (8 bytes)
Diagnosis Object
(last 4 bytes)
Condensed Mode
Diagnosis
Extended Mode
Diagnosis
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