Commissioning Promag 53 PROFIBUS DP/PA
120 Endress+Hauser
DISPLAY_VALUE module
Any value (IEEE 754 floating point number), including status, can be cyclically transmitted
via the PROFIBUS master (Class 1) directly to the local display using the DISPLAY_VALUE
module (slot 6). Display value assignment to the main line, additional line or information
line can be configured via the local display itself or an operating program (e.g. FieldCare).
Output data
Status
The measuring device interprets the status in accordance with PROFIBUS Profile
Specification Version 3.0. The statuses OK, BAD and UNCERTAIN are indicated on the local
display by a corresponding symbol. → 69
CONTROL_BLOCK module
By means of the CONTROL_BLOCK module (slot 7), the measuring device is able to process
device-specific control variables from the PROFIBUS master (Class 1) in cyclic data
transmission (e.g. switching on positive zero return).
Supported control variables of the CONTROL_BLOCK module
The following device-specific control variables can be activated by changing the output byte
from 0 x:
!
Note!
The control (e.g. switching on positive zero return) is executed by cyclic data transmission if
the output byte switches from "0 to the bit pattern in question. The output byte must always
switch from "0". A switchback to "0" does not have any effect.
Example (change the output byte)
Output data
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5
Display value (IEEE 754 floating point
number)
Status
Module Control variables
CONTROL_BLOCK
0 2: Positive zero return ON
0 3: Positive zero return OFF
0 8: UNIDIRECTIONAL measuring mode
0 9: BIDIRECTIONAL measuring mode
0 24: Run UNIT TO BUS function
Control variables that are executed only if the measuring device is equipped
with the optional Electrode Cleaning Circuit (ECC)
0 5: ECC OFF
0 6: ECC ON
From To Result
0 2 Positive zero return is switched on.
2 0No effect
0 3 Positive zero return is switched off.
3 2No effect
Byte 1
Control
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