Entry type: FAQ, Entry ID: 17398401, Entry date: 02/03/2004
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Set-up restrictions when using universal modules

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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.