Lenze I/O system 1000 - Cyclic Data Transmission

6 PROFIBUS communication
6.3 Communication
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Lenze · I/O system 1000 · Reference Manual · DMS 5.0 EN · 09/2016 · TD17
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6.3.2 Cyclic data transmission
The data communication with PROFIBUS-DP-V0 includes cyclic diagnostics as well as cyclic process
data and parameter data transfer.
[6-3] DP cycle and cycle of the backplane bus
Backplane bus cycle
In a backplane bus cycle,
• the input data (PE) are collected at the inputs and transmitted to the transmit buffer (buffer
send),
• the output data (PA) is written into the outputs by the receive buffer (buffer receive).
PROFIBUS cycle
In a PROFIBUS cycle, the master addresses all assigned slaves sequentially with a DataExchange. In
case of DataExchange, the memory areas assigned to the PROFIBUS are transmitted.
• The data of the PROFIBUS input range is transmitted to the receive buffer (buffer receive).
• The data of the transmit buffer (buffer send) is transmitted to the PROFIBUS output range.
 Backplane bus with transmit and receive buffer
 Input / output modules
• PA: Process image of the outputs,
• PE: Process image of the inputs
 Status C
 PROFIBUS cycle
 Backplane bus cycle
Master
(DPM 1)
Slave
buffer receive
Communications
processor
PA
buffer send PE
01
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