KROHNE H250 M40 FOUNDATION FIELDBUS - Manual (Page 13)

OPERATION
4
13
H250 M40
www.krohne.com 02/2014 - 4001208201 - AD H250 M40 FF R02 en
4.3 Description of the FF block system
The Foundation Fieldbus is a Local Area Network (LAN) for connecting field devices like sensors
and actuators. One of the main benefits of Foundation Fieldbus is line saving in comparison to
the traditional 4...20 mA technology.
The different device functions are implemented in a block-based scheme within a user
application. In this block scheme, a distinction is made between the Resource Block, Transducer
Block and Function Block.
4.4 Used abbreviations
1 Resource Block (RB)
2 Transducer Block (TB)
3 Function Block (FB)
4 Device FF communication
5 Foundation Fieldbus
AI Analogue Input Block
IT Integrator Block
PID Proportional Integral Derivate Block
RB Resource Block
TB Transducer Block
R Read (in mode BLK)
W Write (in mode BLK)
R/W Read and Write (in mode BLK)
BLK Block mode
MAN Manual mode
Mix Mix mode (R, W and R/W)
Auto Automatic mode
OOS Out Of Service mode
OD Object Directory
SP Set Point
IV Initial Value
PV Process Value (factory settings)
AD_H250_M40_FF_R02_en_4001208201_PRT.book Page 13 Friday, February 21, 2014 11:25 AM