QUESTION:
Does the size of the I/O address area have an influence on the size
of the configuration byte?
ANSWER:
If you configure a DP/DP coupler with an I/O address area of up to
16 bytes, one configuration byte is required. However, if you
increase the input or output address area to more than 16 bytes
(see Fig. 1 - Using a universal module with an 18 byte I-address
area), this entails two configuration bytes. If you increase the
address area yet further, three configuration bytes are required
from the 33rd byte.
Note:
Under normal circumstances, you, as the user, have no influence
over the use of the configuration bytes that are described here.
The configuration bytes do not restrict the specified I/O address
area of the DP/DP coupler either. They only form an internal setup
limit that needs to be watched during configuration.
Fig. 1: Configuring a universal module with 18-byte input address
area
Important:
You can configure up to 16 modules in a DP/DP coupler and the sum
of the configuration data must not exceed 16 bytes. Please pay
watch out for this when using universal modules and address areas
greater than 16 bytes.
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german
