Technical data

R911305038 / 01 | Rexroth VCP-Operating Concept Electric Drives and Controls | Bosch Rexroth AG 6-69
DeviceNet
6.6 DeviceNet
The operating device is incorporated into the DeviceNet network as a
DeviceNet slave. The communication between a controller (master or
scanner) and the operating device (slave) is based on the Predefined
Master/Slave Connection Set.
Explicit Message Connections and Poll I/O Connections are used as
Connection Instances.
6.6.1 Explicit Message
Explicit Messages are used to exchange data between the operating
device and the controller. This requires you to create a function block in
the controller which assembles the payload into Explicit Messages.
6.6.1.1 Storing Data
All data displayed by the operating device are stored in the operating
device’s data memory.
The size of the data memory is 2500 words.
The data memory is word-oriented. The addresses are always word
addresses, both from the operating device's and the controller's pers-
pective.
6.6.1.2 Exchanging Data
You need to create a program (function block) in the controller which is
used to establish a data exchange between the operating device and
the controller by means of Explicit Messages. For this, make sure that
the data on both devices are consistent.
You can carry out the data exchange cyclically or carry it out event-
controlled through the controller using the I/O Poll Telegram.
Fig. 6-104: Data exchange, DeviceNet
Operating Unit (DeviceNet Slave)
Display and
Operating
Unit
Data
Memory
DeviceNet
Slave
write
read
read
write
Explicit Message
write
Explicit Message
read
Controller / PLC
DeviceNet
Master
Controller
Unit
read
write