HBK CB1010, Operating Manual

Page: 14 / 104

CANHEAD
BUS CONFIGURATION
12
5 BUS CONFIGURATION
With a bus system, intelligent measurement electronics are interconnected or connected
to the central evaluator and server / PC by a data line.
A CAN bus with a fixed baud rate has been chosen for the transfer of data generated in
the base module and in the amplifier module. This gives the optimum ratio between man­
agement data, parameterization data and process data (measured values) with at the
same time faster data transfer rates and greater bus lengths.
The bus allows cyclic and acyclic data to be transferred. This ensures that the synchro­
nized AD converter operating in parallel can process in real time. A HBM specific CAN
protocol is used for data transport of up to 12 CANHEADs in one bus line.
5.1 Bus configuration with MGCplus
The master here is the ML74B communications module, to read the data into an MGCplus
system. In conjunction with catman measurement software, this provides a tried and
tested plug‐and‐play solution.
MGCplus
ML74B / AP74
1))
Termination
resistor
CAN bus linear structure with trunk and drop lines
10
channels
10 channels
max. 12 CANHEAD modules
T‐conn.
no termination
resistor required
10
channels
10
channels
Fig. 5.1 Connection to MGCplus
1)
The AP74 connection board in the MGCplus provides an built‐in termination resistor.
The T‐connector 1‐CANHEAD‐M12‐T is used if a drop line is to be established.
Notice
It is preferable to install CAN bus as a line bus. Only use the T‐connector on the input side.