User's Manual

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Page 122 SITRANS LR260 (PROFIBUS PA) – OPERATING INSTRUCTIONS A5E32337685
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G: Communications PA
AIFB1 and AIFB2 return 5 bytes of data each:
The first 4 bytes are the floating point representation (IEEE) of the variable. The variables
are the outputs of the function block. The 5th byte is the status word and the list of
possible values is given in the chart below.
The 5 bytes must be read consistently, in a contiguous chunk: they cannot be read byte by
byte, and cannot suffer an interrupt. If you are using an S7-300 / 400, you will need to use
SFC14 DPRD_DAT: Read Consistent Data of a Standard DP Slave.
Status Byte
In PROFIBUS PA there are two possible types of status byte:
status byte: originally defined in Profile Standard V3.0
condensed status: an alternative status byte defined in Profile Standard V3.01
You can choose which type of status byte will be returned, by enabling or disabling
Condensed Status Mode (COND. STAT. MODE) (3.6.1.). The default setting is Condensed
Status enabled:
Condensed Status
These codes are available when Condensed Status is enabled. See Condensed Status
Setup (COND. STAT. SETUP) (3.6.) on page 80 for more details.
Condensed Status
Hex
value
Status – GOOD Description
0x80 GOOD – ok No error or special condition is associated with this value.
0x84
...0x87
GOOD – update event
Set if the value is good and the block has an active Update
event. (This status remains active for 20 seconds.)
0x89,
0x8A
GOOD – active advi-
sory alarm
Set if the value is good and the block has an active Alarm.
0x8D,
0x8E
GOOD – limit check/
update event
See
Status Codes for Good Quality
on page 124.
0xA0
...0xA3
GOOD – initiate fail
safe
This fault is not generated by the product, but can be simu-
lated.
0xA4
...0xA7
GOOD – maintenance
required
Value is valid. Maintenance is recommended within a
medium-term period.
0xA8
...0xAB
GOOD – maintenance
demanded
Value is valid. Maintenance is demanded within a short-
term period.
0xBC
...0xBF
GOOD – function
check
Device performs internal function check without influenc-
ing the process. Value is valid.