INFICON SKY CDGxxxD (DeviceNet) - Manual (Page 24)

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tira51e1 (2009-01) CDGxxxD.cp
The following behavior with respect to Data Type applies:
The data type value will be set automatically based upon the first valid I/O con-
nection established by the device.
If no established I/O connections exist, which include an attribute from this object,
then the Data Type attribute is settable provided that the object is in the Idle State.
The following example demonstrates this behavior:
A device specifies an instance of the S-Analog sensor object as well as two static
assembly object instances, both with data attribute components mapped to this
object instance. Assembly object instance ID 1 specifies INT data types and
assembly object instance ID 2 specifies REAL data types.
After the device is on-line, it is configured with an I/O connection to assembly
instance ID 2. When the connection transitions to the Established State, this object
instance attribute Data Type is automatically set with the value for REAL before
any data is communicated to, or from, the object instance. Any subsequent attempt
to connect to assembly instance ID 1 would then be rejected and result in an
INVALID ATTRIBUTE VALUE error with the additional error code indicating the ID
of the offending attribute, which in this case would be the connection path.
4.4.3.5 Behavior
Data type