User Manual

Table Of Contents
38 I/O Modules
Special Modules
WAGO-I/O-SYSTEM 750
I/O Modules
In doing so, the slaves only send "excerpts" of their process data to the master.
The size of these "excerpts" is determined by "cutoff" in the configuration
mode. The command "cutoff" is symmetrical for the data stream entering and
exiting the master. The current data to be read and written, which are assigned
slots in the master's process image, remain (see Figure 11).
Data Direction Slave Master
Data Direction Master Slave
Cut off by cutoff, is not transmitted
Process image
Radio transmission
(without control/status byte )
Slave A Slave B Slave C
Master
Slave X
...
...
...
Slot1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 6
...
Figure 11: Process image mapping between master and slaves g064410e
The following example (see Table 16) shows that both slots in the process im-
age not occupied by slaves (see slot 1 and 4) as well as slots that are not visi-
ble due to a "cutoff" of 0 (see slot 4) can be visible. A "cutoff" of 0 is inde-
pendent of whether a device has been set up for the slot or not.
Table 16: Example of a slot configuration
Slot Slave Cutoff Offset
1 - 4 0
2 "Pump" 6 4
3 "Valve" 10 10
4 - 0 20