Festo IFB11-03, Electronic Manual

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B. Accessories
B−15
Festo P.BE−VIFB11−03−EN en 0503g
B.2.1 Controlling the analog IOs with the bus
The analog input/output data are cyclically transferred in
a data word (16 bit) as 12 bit data.
The master can only exchange data with one analog chan
nel per fieldbus cycle.
The start addresses for analog inputs and analog outputs
must be identical.
Output: The master can output the next analog value
OWn+1, when the previous data exchange has been suc
cessfully completed (OW n = IW n).
Input: The requested analog input value is available once
the bits 0..3 contain the analog word of the requested
channel address and data direction.
Nodes
FB11
Analog
I/Os
Master
Analog
input word
IW n Analog
output word
OW n
Fig.B/13: Analog data exchange between Master and valve terminal in DeviceNet