BECKHOFF FM33xx - Manual (Page 30)

I/O configuration
FM33xx 25
Multiplex mode channel data in the
TwinCAT System Manager
The channel data of a TC-Plug module is mapped and displayed as follows
in the TwinCAT System Manager, independently of the number of channels
that are configured (associated):
Process data for the TC-
Plug modules in the
TwinCAT System Manager
Control/status byte and
channel data for the 4
thermocouple inputs In order to reduce the quantity of data that has to be transferred over the
fieldbus, the thermocouple input data for a maximum of 4 channels only
(e.g. for channels 0 to 3) is transferred over the fieldbus in any one fieldbus
cycle. The control/status byte can be used to request the analog values of
another 4 channels (e.g. for channels 4 to 7, 8 to 11 etc.).
Control/status
byte
Channel
data