Siemens S5-155U System Manual page 479

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Addressing for cyclic/selective
sampling
System Manual
C79000-B8576-C109-03
However, analog input modules and analog output modules may be
given the same address with cyclic sampling because they are
distinguished by the user program. This is not possible with selective
sampling.
For cyclic sampling, you can address the module in the address range
from 0 to 255, and for selective sampling from 128 to 255. For
selective sampling, you can also use the address range from 0 to 127
after appropriate programming in DB 1 of the user program.
Example
On an analog output module with 8 outputs with start address 144
(IB 144 = output byte 144), output channel 7 is to be scanned by the
program.
Step
Action
1
Affix the self-adhesive label with address 144 on the free
field under the addressing switch on the module. ADB 4 and
ADB 7 are marked on the label.
2
Press the appropriate rockers of the addressing switch down
on the side marked by a dot on the module cover. Set the
other rockers to the opposite setting. This sets the start
address of the module.
ADB 4 and ADB 7 results in 2
3
Enter the address 144 + 7 x 2 = 158 in the program for
output channel 7.
The 470 Analog Output Module
4
7
+ 2
= 16 + 128 = 144
9 - 109
9

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