WAGO I/O SYSTEM 750 750-833 Manual page 63

The PFC variables are also configured through the hardware catalogue.
From 1 to 64 bytes of input variables and from 1 to 64 bytes output variables
may be configured for field bus controllers up to SW 03.
In addition, there are PFC configuration modules available with data type
information from SW 03.
Note
PFC output variables are defined from point of view of the programmable
field bus controller. From the point of view of PROFIBUS, these are input
variables. Accordingly, PFC input variables are output variables for
IEC 61131-3 access of the field bus:
Fig. 3.4.2-10: Correlation of IEC 61131-3 variables and PFC variables
WAGO-I/O-SYSTEM 750
Bus System
IEC 61131-3 input variable
PFC input variable
Fieldbus
PLC
input
variables
PLC
output
variables
Programmable Field Bus Controller 750-833
= PFC output variable
= IEC 61131-3 output variable
Programmable
fieldbus controller
Process Image
PFC
input
variables
PFC
output
variables
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