Fluid Components International ST100 Series PROFIBUS PA - Manual (Page 11)

ST100 Series Profibus PA
Fluid Components International LLC 7
Transducer Blocks Description
There are 3 Process Data Transducer blocks in the ST100, one for each of the process variables that the ST100 can measure, flow, temperature, and
pressure.
Note: Not every process variable is available in every ST100 model.
Flow Transducer Block Parameters
There are three possible flow types; but only one is active at a time. The active flow type is the only one that has valid data in that structure of the
block.
REL. INDEX PARAMETER SLOT INDEX DATA TYPE (LENGTH) STORE SIZE READ/WRITE
8 CALIBR_FACTOR 6 24 FLOAT S 4 RW
9 LOW_FLOW_CUTOFF 6 25 FLOAT S 4 RW
10 MEASUREMENT_MODE 6 26 UNSIGNED 8 S 1 RW
11 FLOW_DIRECTION 6 27 UNSIGNED 8 S 1 RW
12-14 NOT USED 6 28-30
15 NOMINAL_SIZE 6 31 FLOAT S 4 RW
16 NOMINAL_SIZE_UNITS 6 32 UNSIGNED 16 S 2 RW
17 VOLUME_FLOW 6 33 101(DS-33) D 5 R
18 VOLUME_FLOW_UNITS 6 34 UNSIGNED 16 S 2 RW
19 VOLUME_FLOW_LO_LIMIT 6 35 FLOAT S 4 R
20 VOLUME_FLOW_HI_LIMIT 6 36 FLOAT S 4 R
21 MASS_FLOW 6 37 101(DS-33) D 5 R
22 MASS_FLOW_UNITS 6 38 UNSIGNED 16 S 2 RW
23 MASS_FLOW_LO_LIMIT 6 39 FLOAT S 4 R
24 MASS_FLOW_HI_LIMIT 6 40 FLOAT S 4 R
25-42 NOT USED 6 41-58
43-52 RESERVED BY PI 6 59-68
53 VELOCITY_FLOW 6 69 101(DS-33) D 5 R
54 VELOCITY_UNITS 6 70 UNSIGNED 16 S 2 RW
55 VELOCITY_LO_LIMIT 6 71 FLOAT S 4 RW
56 VELOCITY_HI_LIMIT 6 72 FLOAT S 4 RW
57 DEVICE_VARIABLE_CODE 6 73 UNSIGNED 8 D 1 R
The following parameters are in the block for compatibility with the profile for flow but perform no real function since the method of measurement
used by the ST100 does not use those parameters. The parameters are CALIBR_FACTOR, LOW_FLOW_CUTOFF, MEASUREMENT_MODE, and
FLOW_DIRECTION.
The NOMINAL_SIZE, and the NOMINAL_SIZE_UNITS parameters are used by the Volume flow and the Mass flow. These parameters are associated
with the pipe dimensions and units. NOMINAL_SIZE is the diameter of the pipe.
The DEVICE_VARIABLE_CODE is use to identify the active flow type that the instrument is operating in. The Volume Code = 0, the Mass Flow
code = 3, and the velocity flow code = 4.