Can Interface - HBM MP85A Operating Manual

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• Does the network have sufficient reserves for the transmission of the
planned data or could the network load become too great?
• Are there nodes that could load the network through broadcasts, i.e. data
sent to all nodes?
In order to avoid disturbance of measurement operation by other network
nodes, you can also operate the devices in a separate network disconnected
from your company network. Connection to the company network would only
be necessary if external access to the measurement devices themselves is
necessary. If access to the generated data alone is required, you can imple-
mented this with a PC connected between the networks − linked via one
network card to the devices and via a second network card to the company
network.
If the device is to be connected to the company network, we recommend the
use of a "Managed Switch" as these (higher quality) devices are by experi-
ence less susceptible to disturbances. The network with the measuring instru-
ments and any PCs integrated in this network is then connected to the
company network via the Switch.
In order to achieve the best possible separation between the network with the
measuring instruments and the remaining company network, you can also use
a router that separates both networks and only transmits messages between
the two networks when necessary.

3.6.2 CAN interface

The CAN bus is connected via screw terminal 1. A maximum of 32 CAN
nodes can be connected in one bus segment (in accordance with the
CANopen specification).
The CAN bus needs a termination resistor of 120 Ω on the first and last bus
node The maximum number of termination resistors the bus cable can have
.
is two. The MP85A process controller has an integrated termination resistor,
which is activated by toggle switch S2.
Device 1
Fig. 3.13: CAN interface connection
HBM
Low High
MP85A process controller
A2392−5.0 en