Operating instructions

Functions
5.11 Operation in fieldbus systems
CU240S and CU240E Control Units, FW 3.2
178 Operating Instructions, 03/2009, A5E02440075B AA
Data structure of the parameter channel
Parameter channel
The parameter channel can be used to process and monitor process data (write/read) as
described below. The parameter channel always comprises four words.
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Figure 5-33 Structure of the parameter channel in the telegram structure
Parameter ID (PKE), first word
The parameter ID (PKE) is always a 16 bit value.
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Figure 5-34 PKE structure
● Bits 0 to 10 (PNU) contain the rest of the parameter number (value range 1 to 61999).
An offset must be added, which is defined by IND with the upper bits (acyclic) or the lower
bits (cyclic) of the byte, for parameter numbers ≥ 2000.
● Bit 11 (SPM) is reserved and is always 0.
● Bits 12 to 15 (AK) contain the request or response ID.
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