Helmholz 700-651-CAN01, Руководство пользователя

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5 Programming (CAN Layer 2)
5.1 Data exchange
When the master has detected that parameterization and
configuration is successfully completed without errors at the end
of the start-up phase and the PLC has been started, the DP/CAN
coupler can transmit and receive frames via CAN.
5.2 Handshake bits
The 5 bytes of the HANDSHK_IN area signal the receipt of CAN
messages via the Receive Object and the DI objects. The bits are
inverted each time a new message is received (toggle bit).
Byte Bit Function
0 0 New frame Receive Object
1 New frame receive object 1
2
New frame receive object 2
3 New frame receive object 3
4 New frame receive object 4
5 New frame receive object 5
6
New frame receive object 6
7 New frame receive object 7
… …
4 0 New frame receive object 32
1
New frame receive object 33
2 New frame receive object 34
3 New frame receive object 35
4 New frame receive object 36
5
New frame receive object 37
6 New frame receive object 38
7 New frame receive object 39
The objects „RecObjStatus” and “RecObjCmd” must also be taken
into account in the interpretation of the Receive Object.
20 DP/CAN Coupler