Cyclic Data; Status Byte - Siemens SITRANS LR200 Instruction Manual

Cyclic Data

When you configure SITRANS LR 200 on the PROFIBUS PA bus, there are two slots
available for modules.
Note:
Each of the slots has to have a module defined in it.
Slot 0 always transmits AIFB1 information
changed to AIFB2 information. If you do not wish to have data transmitted, then you must
use a Free Place module in that slot.
Each of the two Analog Input Function Blocks can be set up to return Level, Distance, or
Volume. Within the function blocks, the values are scaled according to the user
requirements (please see
AIFB1 and AIFB2 return 5 bytes of data each:
AIFB1 byte 1
AIFB2 byte 6
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 PD Slave.

Status Byte

Values in hex notation
0x80
0x84
0x89
0x8A
0x8D
0x8E
1.
For more information, please see
page 72.
Page 26 SITRANS LR 200 (PROFIBUS PA) – INSTRUCTION MANUAL
1
; slot 1 defaults to Free Place, but can be
Analog Input Function Blocks 1 and 2
Floating Point
byte 2 byte 3
byte 7 byte 8
Status Codes for Good Quality
Description
Data is GOOD.
A parameter in the function block has been changed: status
active for 10 s
Active low warning.
Active high warning.
Active low alarm.
Active high alarm.
Analog Input Function Blocks 1 and 2
on page 72 for details).
Status
byte 4 byte 5
byte 9 byte10 byte10
on
7ML19985HP01