Beckhoff BC7300 Manual page 21

Example
BC7300
Bus Terminal Controller
The process image in the Bus Terminal Controller ignores all the Bus
Terminals that have been assigned to the MODBUS process image. The
controller first enters all the byte-oriented Bus Terminals, following the
sequence with which they are plugged in. The digital Bus Terminals come
next. The PLC variables are positioned from addresses %I128 and
%Q128.
02
MODBUS
RUN
RX
24V 0V
TX
PLC
+ + + +
0
PE PE PE PE
0
POS 1 KL1012 MODBUS terminal
POS 2 KL1012 BC7300 terminal
POS 3 KL2012 MODBUS terminal
POS 4 KL2012 BC7300 terminal
POS 5 KL3002 MODBUS terminal
POS 6 KL3002 BC7300 complex terminal
POS 7 KL3002 BC7300 compact terminal
POS 8 KL4032 MODBUS terminal
POS 9 KL4032 BC7300 complex terminal
POS 10 KL4002 BC7300 compact terminal
KL9010
PLC Variables
POS 11 16 bytes INPUT
POS 12 16 bytes OUTPUT
+ + + + + +
PE PE PE PE PE PE PE PE PE PE PE PE PE PE PE PE
21