Technical data

6-92 Bosch Rexroth AG | Electric Drives and Controls Rexroth VCP-Operating Concept | R911305038 / 01
DIN Measurement Bus
connection to the controller using interface X2 and handles the DIN
Measurement Bus protocol using interface X3.
This small operator terminal therefore does not feature the following
functions:
– Printout of messages, logs and so on
– Barcode scanner connection
When used as a gateway, the small operator terminal has the following
additional functions not included with the standard small operator ter-
minal:
– Extended poll area
– Cache function for read-only data
– Network status image.
6.7.1.1 Extended Poll Area
With the cyclic poll area, you can access the following functions on the
master or slave operating device:
– Write coordination byte (WCB)
– Serial message channel
– Status LEDs for function keys
The function has been enhanced to offer more than the standard poll
area for direct PLC connection. Rather than being statically mapped to
the operating device functions, this poll area is event-controlled and
transmitted for each specific slave by means of the trigger byte. In
other words, the controller fills the poll area and then transfers it to the
gateway using bit 7 (value 0x80) of the trigger byte. Once the function
has been executed, the gateway writes the return value and the code
0x40 into the trigger byte. The controller then resumes control of the
data area.
The poll area has the following set layout, which may be either byte-ori-
ented or word-oriented, depending on the address specified: