PROFIBUS-DP User Manual for Encoder - heidenhain - DR ...
PROFIBUS-DP User Manual for Encoder - heidenhain - DR ...
PROFIBUS-DP User Manual for Encoder - heidenhain - DR ...
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<strong>PROFIBUS</strong> IO data description<br />
50<br />
TMSG (Message Time)<br />
The times TMSG may elapse to handle all acyclic services<br />
between the master and slave. These acyclic services shall be<br />
executed after the cyclic services. To ensure an Isochronous <strong>DP</strong><br />
cycle this part shall be limited.<br />
T<strong>DP</strong> (<strong>DP</strong>-Cycle Time)<br />
T<strong>DP</strong> is the time a <strong>DP</strong> cycle lasts.<br />
Content of a <strong>DP</strong> cycle:<br />
SYNCH: Global_Control telegram <strong>for</strong> synchronization. The end of<br />
the Global_Control (GC) telegram marks the beginning of a new<br />
<strong>DP</strong> cycle.<br />
DX: Data_Exchange<br />
With the service Data_Exchange, user data exchange between<br />
master and slave 1-n is executed sequentially.<br />
MSG: acyclic services. After cyclic transmission the master may<br />
transmit an acyclic service. e.g. parameter request via MS1/MS2<br />
AR.<br />
RES: Reserve<br />
The reserve consists of the "active spar time" which is used as an<br />
active rest (master transmits to itself) and the "passive spar time".
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