Chapter 2
Data Exchange
Overview
The mapping of USS data to PROFINET is based on the mapping scheme defined by the PNO working
group for PROFINET IO Proxy Devices. In short, this means that on PROFINET, each USS slave is
represented through a dedicated slot. Slot #0 is reserved for the gateway itself, while slot #1... 31 is as-
sociated with the slaves on the USS network. Each slot uses one subslot for the mapping of its assigned
data to PROFINET.
In addition to the Process Data (PZD) and Parameter Data (PKW), the Slave Data Set also features a
Slave Status Register, which reflects the overall status of the slave.
Note that all data is exchanged transparently. This means that in order to be able to access Parameter
Data (PKW), the parameter access protocol used to access PKW data must be implemented entirely on
the PLC side.
See also...
• 2-2 “USS Master Implementation”
• 2-3 “Slave Data Set”
• 3-4 “USS & PROFINET Configuration (SIMATIC Manager)”
• 4-1 “Web Interface” (4-3 “Master Configuration”)
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