Siemens Micromaster Profibus, Инструкция по эксплуатации

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PROFIBUS Optional Board Operating instructions
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The MICROMASTER4 is controlled via the cyclical PROFIBUS-DP channel. This
same channel can be used to exchange parameters.
The structure of useful data for the cyclical channel is defined in the PROFIDrive
Profile, version 2.0, and referred to as the Parameter Process data Object (PPO).
The PROFIDrive Profile defines for the drives the useful data structure with which a
master can access the drive slaves using the cyclical data communication method.
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The useful data structure for cyclical data traffic is divided into two areas which can
be transmitted in each telegram:
Process data area (PZD), i.e. control words and setpoints, or status information
and actual values
Parameter area (PKW) for reading/writing parameter values, e.g. reading out faults,
or reading out information about the properties of a parameter such as, for
example, min/max limits, etc.
With which PPO type (see next page) the converter is addressed by the
PROFIBUS-DP master can be defined in the configuration data for the master
when the bus system is started up. Which type of PPO is selected depends on the
function of the drive in the automation network. Process data are always
transferred. They are processed as top priority in the shortest time slices in the
drive.
Process data are used to control the drive in the automation network, e.g. On/Off
commands, setpoint inputs, etc.
The parameter area enables the user to access all parameters stored in the
converter via the bus system. For example, to read out detailed diagnostic
information, faults messages, etc.
The telegrams for cyclic data transmission thus have the following basic structure:
Protocol frame
Useful data
Protocol frame
(header)
Parameter (PKW)
1)
Process data (PZD)
(trailer)
332
1) PKW: Parameter identifier value
Five types of PPO are defined according to PROFIDrive Profile, version 2.0:
½
Useful data without parameter area, with two or six words of process data or
½
Useful data with parameter area, with two, six or ten words of process data.