KROHNE MFC 400 Profibus - Manual (Page 25)

COMMISSIONING / OPERATION
4
25
MFC 400
www.krohne.com 06/2013 - 4002835301 - AD MFC 400 PROFIBUS R01 en
Formula: Formula: Formula: Formula:
value = (-1)
VZ * 2 (Exponent – 127) * (1 + Mantissa)
value = (-1)
0
* 2
(129 – 127)
* (1 + 2
-1
+ 2
-2
+ 2
-3
)
value = 1 * 4 * (1 + 0.5 + 0.25 + 0.125)
value = 7.5
Status value Status value Status value Status value
The PROFIBUS device supports the PROFIBUS-PA Profile Version 3.02. In this Profile the
Condensed Status and Diagnosis has replaced by default the Classic Status and Diagnosis of the
PROFIBUS-PA Profile Version 3.0. The Condensed Status and Diagnosis has been created to
make diagnostic events more obvious and to allow predictive and preventive maintenance.
Nevertheless Classic Status and Diagnosis is still available for this device. It is implemented for
backwards compatibility to "older" devices or PLC systems which do not support Condensed
Status and Diagnosis.
The device may be switched between "Condensed Status and Diagnosis" and "Classic Status and
Diagnosis"
• automatically during start-up of the cyclic data transfer by setting the parameter PRM_COND
within the Set_Prm service data.
• using an engineering tool (e.g. DD/DTM) to write the parameter COND_STATUS_DIAG (slot 0,
index 43).
• using the device display menu (menu item "Condensed Status", C6.8.8)
Coding for the first two parameters is:
• 0: Classic Status
• 1: Condensed Status (factory setting)
Coding for the third selection is:
• OFF: Classic Status
• ON: Condensed Status (factory setting)
INFORMATION!
The parameter COND_STATUS_DIAG cannot be modified directly if cyclic data transfer is active.
Nevertheless it is reset to the factory setting if a reset to default data is requested by an
engineering tool.