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Appendix A
Operation manual
12
12 Appendix A
Information
Please note that the protocol described here can only be used with the
5 th generation of STÖBER inverters.
This chapter discusses the structure of the PKW1 protocol in detail.
12.1 General characteristics
• 16-bit address each for parameter number and subindex.
• Transmission of whole arrays, areas thereof or the entire parameter
description.
• Transmission of different parameters in one access (multi-parameter jobs).
• Only one parameter job is processed at a time (no pipelining).
• A parameter job/rely must fit in one data block (max. of 240 bytes). The
maximum length of the data blocks can be less than 240 bytes due to slave
characteristics or the bus configuration.
• "Multi-parameter" jobs are defined for optimized, simultaneous access to
different parameters (e.g., HMI screens).
• There are no cyclic parameter jobs, in contrast to PKW0 (of DP-V0).
12.2 Parameter jobs and responses
This chapter provides detailed information on the organization of the protocol of
the PKW1 standard which is only required when no SIMATIC S7 controller is used
with our FB50.
A parameter job consists of three areas:
• Job header: ID for the job and the number of parameters which are accessed.
Addressing of an axis for multiple-axis drives.
• Parameter address: Addressing of a parameter. The parameter address only
appears in the job, not in the response.
• Parameter value: There is one area for the parameter value for each
parameter. Parameter values appear only in either the job or in the response,
depending on the job ID.
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