Technical data

Installation, user and maintenance manual – GAHP-GS/WS
51
The CAN bus network is characterized by a series of elements (appliances or CCPs) called
nodes, connected to each other by a three-wire cable. The nodes are of two types: termi-
nal nodes and intermediate nodes.
Terminal nodes are appliances or CCPs that are connected to one other element •
only.
Intermediate nodes are appliances or controllers which are connected to two other •
elements.
The diagram in Figure 6.7 Example of CAN BUS → 51 gives an example of a CAN BUS
network: 3 appliances are connected to each other and to 1 CCP. Appliance D and the
CCP (A) are terminal nodes, while appliances C and B are intermediate nodes as they are
connected to 2 elements.
One CCP can control up to 3 appliances of the same type.
Figure 6.7 – Example of CAN BUS
Terminal nodes and intermediate nodes
LEGEND
A Controller
B-C-D Appliance
1-4 Terminal nodes
2-3 Intermediate nodes
What is the CAN BUS cable
The cable to be used must be suitable for CAN BUS applications.
The following table gives details of some types of CAN BUS cables, grouped according to
the maximum distance covered by each single type.
Table 6.2 – CAN BUS cables type
CABLE NAME SIGNAL / COLOR MAX LENGTH Note
Robur
Ordering Code O-CVO008
ROBUR NETBUS H= BLACK L= WHITE GND= BROWN 450 m
Honeywell SDS 1620
In all cases the fourth conductor should not be used
BELDEN 3086A
H= BLACK L= WHITE GND= BROWN 450 m
TURCK type 530
DeviceNet Mid Cable
TURCK type 5711 H= BLUE L= WHITE GND= BLACK 450 m
Honeywell SDS 2022
TURCK type 531 H= BLACK L= WHITE GND= BROWN 200 m
Example types of cables used to connect the CAN network.
For total distances lower than 200 m and networks with a maximum of 4 nodes (example:
up to 3 GAHP + 1 controller) a simple shielded cable 3x0.75 mm may be used.