FMC Corporation - Talstar 80 - Handbuch (Seite 59)

Proline Promass 80 PROFIBUS PA Commissioning
59
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:
Example (change the output byte)
Output data
EMPTY_MODULE module
The measuring device is a so-called modular PROFIBUS slave. In contrast to a compact slave, the
structure of a modular slave is variable - it consists of several individual modules. In the GSD file,
the individual modules are described with their individual properties. The modules are permanently
assigned to the slots, i.e. the sequence or arrangement of the modules must be observed when
configuring the modules. Gaps between configured modules have to be assigned the
EMPTY_MODULE module.
For a more detailed description, see
→ Page 54
Module Control variables
CONTROL_BLOCK
0 → 2: Positive zero return ON
0 → 3: Positive zero return OFF
0
→ 4: Run zero point adjustment
0 → 8: UNIDIRECTIONAL measuring mode
0
→ 9: BIDIRECTIONAL measuring mode
0 → 24: Run UNIT TO BUS function
!
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.
From
→
To Result
0 → 2 Positive zero return is switched on.
2
→
0 No effect
0 → 3 Positive zero return is switched off.
3
→
2 No effect
Byte 1
Control