Bosch PPC6 2 Series Manual de servicio Pagina 319

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R911305038 / 01 | Rexroth VCP-Operating Concept Electric Drives and Controls | Bosch Rexroth AG 6-91
DIN Measurement Bus
6.7 DIN Measurement Bus
You can connect a small operator terminal as a slave to a controller
and then use this device as a gateway for other slaves in a DIN Measu-
rement Bus.
Fig. 6-142: DIN Measurement Bus structure
When the operating device is connected to the controller (host compu-
ter) this is usually a point-to-point connection. In this case, the control-
ler is the master and the operating device is the slave.
The small operator terminal in turn acts as the gateway and bus master
in the DIN Measurement Bus. You can connect additional small opera-
tor terminals as slaves to this operating device.
A detailed description of the connection between the host computer
and gateway is provided for each type of connection.
The firmware used in the small operator terminal that operates as the
DIN Measurement Bus master differs from the firmware used in the
connected small operator terminals functioning as slaves.
6.7.1 DIN Measurement Bus Master
Any process computer can be used as a DIN Measurement Bus mas-
ter, provided that it complies with the following requirements:
Communication takes place according to DIN66348 part 2 (specifies
data link layers 1 and 2 of the ISO/OSI layer model).
Data contents interpreted as per specifications.
The services (DIN Measurement Bus user data contents) are defined
independently of addresses. A number of different address formats is
provided for the connection. An internal address format is used for indi-
rect PLC connections. Linear, byte-oriented memory addressing with
an address space of 224 bits is used for general process computer
connections.
If you choose to use a small operator terminal as a bus master, it offers
the full range of functions of a small operator terminal that manages
Host
Controller
(Master)
Operating
Terminal
(Gateway as
Bus Master)
Operating
Terminal
(Slave)
Operating
Terminal
(Slave)
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