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Old July 17th, 2008, 07:47 AM
agupta agupta is offline
Fieldbus Member
Join Date: Dec 2003
Posts: 55
Block Parameters

Q: Do all the device manufacturers have to follow this definition of the parameter attributes strictly?

A: Yes, any parameter that is defined by FF has to be exactly as defined.

Q: Is there any leeway for them to, say, change the data type to a U16?

Q: But how about changing the initial value to, say 5 (since it is within the 0-15 range)?
A: The FF defines the initial (default) value such that an unconfigured block will operate. It may not operate as desired, which can be done after configuration of the block. In this example the initial value will disable alarm.

Q: what about changing the valid range to 0-255 (since the data type is a U8)?
A: The valid range can not be changed. The vendor is required to check the range when a configuration or tuning change is attempted.

Q: Is there a guideline for this kind and level of conformance?
A: If the specification uses word 'may' or 'should' in the definition, then it implies that impementation is not required to follow that part of the definition. Otherwise, the implementation has to be in full conformance with the specifications.

Ashok Gupta


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