Siemens SITRANS LR560 Operating Instructions Manual page 139

Hex
Status – GOOD
value
0xA4 GOOD – maintenance
...0xA7 required
0xA8 GOOD – maintenance
...0xAB demanded
0xBC GOOD – function
...0xBF check
Hex Status –
value UNCERTAIN
UNCERTAIN – substi-
0x45
tute set
UNCERTAIN – initial
0x4F
value
0x68 UNCERTAIN – mainte-
...0x6B nance demanded
UNCERTAIN – simu-
0x73
lated value, start
7ML19985LT01 SITRANS LR560 (PROFIBUS PA) – OPERATING INSTRUCTIONS
Condensed Status (GOOD) (cont' d )
Description
Value is valid. Maintenance is recommended within a
medium-term period.
Value is valid. Maintenance is demanded within a short-
term period.
Device performs internal function check without influenc-
ing the process. Value is valid.
Condensed Status (UNCERTAIN)
Description
Output of Failsafe logic only.
Default value as long as no measured value is available or
until a diagnosis is made that affects the value and the
status accorded to it.
Usability of the process value depends on the application.
Value is potentially invalid. Cause can be determined by
reading the extended diagnostics
demanded within a short-term period.
Indicates the start of a simulation.
Simulation of a measured value or Input FB mode changes
from AUTO to MAN.
• This status remains active for at least 10 seconds:
– after enabling simulation
– after setting the FB to MAN mode
– after a restart (e.g. power down cycle) if the simula-
tion is enabled or the FB is in MAN mode
– after passivation is cleared if simulation is enabled or
the FB is in MAN mode
• In MAN mode the status remains until a subsequent
write command overwrites the OUT value after the 10
seconds have expired.
• In simulation mode the written status is buffered and
appears in the value flow after 10 seconds. However the
new written SIMULATE parameter with its status can
be read before the 10 seconds have expired.
a)
. Maintenance is
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