14
Communication Model
See diagram on previous side
All variables and parameters of the transmitter are assigned to blocks.
Resource Block (RB)
Describes the transmitter characteristics (manufacturer, device name,
operating status, general status).
Analog Input Block (AI)
2 x 4 Analog Input Function Blocks provide for cyclic transmission of measured
values (currently measured value with status, alarm limits, freely selectable
process variable from up to 2 measuring modules).
Analog Input Transducer Block (AI TB)
Provides for acyclic data transmission. Calibration, configuration, and main-
tenance commands coming from the control station are processed in the
Transducer Block. The sensor signal is first preprocessed in the Transducer
Block. From here, the measured value is sent to the Analog Input Blocks where
it can be further processed (limit values, scaling).
Connections (Channels)
The communication model shows the channel numbers for connecting the
function blocks to the Transducer Blocks.