AC LINE
NODE/APP SPECIFIC
uP/CAN
LOCAL
NODE
SUPPLY
GALVANIC
ISOLATION
BOUNDARY
HCPL
x710
HCPL
x710
5 V REG.
TRANSCEIVER
DRAIN/SHIELD
SIGNAL
V+ (SIGNAL)
V– (SIGNAL)
V+ (POWER)
V– (POWER)
POWER
NETWORK
POWER
SUPPLY
Figure 18. Typical DeviceNet node.
Implementing DeviceNet and SDS
with the HCPL-x710
Isolated Node with Transceiver
Powered by the Network (Figure
20), and Isolated Node Providing
Power to the Network (Figure 21).
components are still powered by
the network. This node contains
two regulators: one is isolated and
powers the CAN controller, node-
specific application and isolated
(node) side of the two optocoup-
lers while the other is non-
With transmission rates up to 1
Mbit/s, both DeviceNet and SDS
are based upon the same
broadcast-oriented, communica-
tions protocol — the Controller
Area Network (CAN). Three types
of isolated nodes are
recommended for use on these
networks: Isolated Node Powered
by the Network (Figure 19),
Isolated Node Powered by the
Network
isolated. The non-isolated
This type of node is very flexible
and as can be seen in Figure 19, is
regarded as “isolated” because not
all of its components have the
same ground reference. Yet, all
regulator supplies the transceiver
and the non-isolated (network)
half of the two optocouplers.
NODE/APP SPECIFIC
uP/CAN
ISOLATED
SWITCHING
POWER
GALVANIC
ISOLATION
BOUNDARY
HCPL
x710
HCPL
x710
SUPPLY
REG.
TRANSCEIVER
DRAIN/SHIELD
SIGNAL
V+ (SIGNAL)
V– (SIGNAL)
V+ (POWER)
V– (POWER)
POWER
NETWORK
POWER
SUPPLY
Figure 19. Isolated node powered by the network.
12
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