Operating instructions

08/06 33
4.11.4 Communication relationships of the process data
channel
Re
g
ardless of the process data to be transmitted, the communication relationships o
f
the process data channels must be defined. The connection of PDO channels is done via
the assignment of the identifiers. The identifiers of Rx-/Tx-PDO must match in each
case.
There are two principal possibilities:
- one Rx-PDO to one Tx-PDO (one to one)
- connect several Rx-PDO’s to one TxPDO (one to many)
This process is documented in a tabular form via a communication relationship list.
Example:
Frequency inverter 1 Frequency inverter 2 Frequency inverter 3
PDO Identifier PDO Identifier PDO Identifier
TxPDO1 385 TxPDO1 TxPDO1
RxPDO1 RxPDO1 385 RxPDO1 385
TxPDO2 641 TxPDO2 TxPDO2 642
RxPDO2 RxPDO2 641 RxPDO2
TxPDO3 TxPDO3 TxPDO3
RxPDO3 RxPDO3 642 RxPDO3
Attention! All the TxPDO’s used must have different identifiers !
The Identifier must be clear in the system bus network.
Frequency inverter 2
PDO2
Rx Tx
385 641
PDO1
Rx
Tx
PDO3
Rx Tx
Frequency inverter 1
PDO2
Rx
Tx
385
641
PDO1
Rx
Tx
PDO3
Rx
Tx
Frequency inverter 3
PDO2
Rx Tx
385642
PDO1
Rx
Tx
PDO3
Rx Tx
642