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3.3.7
Correspondence of X-SEL I/O Port Numbers and PLC Addresses
When the X-SEL’s ProfiBus-DP board I/Os are assigned in the input/output (memory) areas of the PLC, the areas
that occupy the PLC memory will change depending on the numbers of I/O points set on the X-SEL side.
ProfiBus-DP board I/Os are assigned in units of 16 bits (16 I/O points); i.e., they are assigned in units of
words.
The example below illustrates the relationship of X-SEL I/O port numbers and PLC I/O addresses according to
the X-SEL’s I/O parameter settings.
1)
Example of system configuration
An example of system configuration is shown below.
CPU
Bus station
number
Station 1 Station 2
Power s
upply
Pr
ofiBu
s
-D
P
ma
ste
r st
at
io
n
Slave station 1 (16 input points)
X-SEL (slave station 2)
Slave station 3 (32 input points/32
output points)
