Endress+Hauser PROFIBUS-DP, Operating Instructions Manual

Page: 20 / 52

SmarTec S CLD 132 PROFIBUS-PA/-DP Operation
20 EHauser
5.3.2 Cyclic data exchange
Cyclic data exchange is used to transfer the measured values during operation.
Module for the cyclic data telegram
The SmarTec S CLD 132 makes the following modules available as input data (data
from transmitter to PLC) for the cyclic data telegram (see also block model in Fig. 8):
1. Main Process Value
This byte transfers the main measured value.
2. Temperature
This byte transfers the temperature.
3. MRS (Measuring Range Switch)
This byte transfers the external hold and the parameter set switch from the PLC to
the transmitter.
Structure of input data (SmarTec S CLD 132 –> PLC)
The input data is transferred from the transmitter in the following structure:
Structure of output data (PLC –> SmarTec S CLD 132)
The output data of the PLC for device control has the following structure:
Index
input
data Data Access Data format /
comments Configuration data
0 ... 4 Analog Input block 1
"Main Process Value" read Measured value (32-bit floating point
number; IEEE-754)
Status byte (0x80) = Ok 0x42, 0x84, 0x08, 0x05
or
0x42, 0x84, 0x81, 0x81
or
0x94
5 ... 9 Analog Input Block 2
"Temperature" read Measured value (32-bit floating point
number; IEEE-754)
Status byte (0x80) = Ok 0x42, 0x84, 0x08, 0x05
or
0x42, 0x84, 0x81, 0x81
or
0x94
Index
input
data Data Access Data format /
comments Configuration data
0 MRS write Byte
Status byte (0x80) = Ok 0x42, 0x84, 0x08, 0x05
or
0x42, 0x84, 0x81, 0x81
or
0x94