DPV1 master device

DPV1 also distinguishes between a class 1 master device (C1) and a class 2 master device (C2).

The acyclic C1 connection is established with the DP startup during cyclic DP operation. From the Wait-Cfg state of a slave device, acyclic DPV1-C1 read telegrams and DPV1-C1 write telegrams can be sent from the master device to the slave device.

The C2 connection has a separate connection setup, which is independent of the cyclic DP connection. The separate connection is usually established by a second C2 master device, so that a manufacturer-specific configuration and diagnostic tool can access the data of the slave device, for example.