Festo CPX-FB6 Manual page 55

2. Commissioning
Festo P.BE-CPX-FB6-EN en 1207c
Address allocation on the Interbus
The address allocation (processing data assignment) of the
inputs and outputs of a CPX terminal on the Interbus depends
above all on the Interbus interface and on the control system
used.
Caution
There are different address allocations on the Interbus.
The cause of this is the arrangement of the process data
within the Interbus interface module.
When allocating the addresses, observe the position of
•
the high and low bytes, as the position of these bytes
may be swapped in combination with some control sys-
tems.
You can then avoid errors in addressing the inputs/out-
puts.
Further specifications on addressing can be found in the
manuals for your controller and for the Interbus interface
module.
The following examples provide basic information on the dif-
ferent address allocations and the positions of the low byte
(n) and the high byte (n+1) with various controllers. There are
two modes:
– In the Siemens mode the lower-value input or output byte
(byte n) is mapped on inputs or outputs 0 ... 7, byte n+1
on the next inputs or outputs (8 ... 15) etc.
– In the standard mode the lower-value input or output
byte (byte n) is mapped on inputs or outputs 8 ... 15, byte
n+1 on the inputs or outputs 0 ... 7.
This assignment applies also for the bytes of the I/O dia-
gnostics interface.
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