DESIGNER’S HANDBOOK 4189350049C EN
Page 54 of 206
5.4
XL, BW, BRW-2 and TRI-2 with sCAN
The traditional DEIF XL indicator with single CAN input (sCAN)
is a “listen only” device
on the CAN bus, and it is therefore not necessary to assign a unique NodeID for an XL
on the bus. Instead, the XL indicator needs to know the CAN data source that will
provide the CAN data to be presented. XL with sCAN protocol requires variable data to
be transmitted in byte 0 and 1 of TPDO1 for the CAN source identified by its NodeID
(source ID). The COBID of the used TPDO1 is: 0x180 +
”Source NodeID number”.
The XDi can be configured to use the same sCAN format as the XL family is using.
It is also possible to configure the XDi to act as a sCAN data source, for example
transmitting its analogue or digital input data in a TPDO1 recognised by the XL family as source data.
It is therefore possible to make a combined system where the XL family of indicators and XDi are using the same
CAN data, and the XDi may share additional analogue or digital input data with other XL or XDi units on the bus.
To define such combined system configurations in a combined system requires a good understanding of XL sCAN
and XDi, so it is recommended to require some assistance from DEIF when such systems are designed.
Application notes may be available from DEIF to help you specify indicators for your combined system.
5.5
Extension modules
The input/output capability of an XDi can be extended by adding one or two extension modules on the rear of the
XDi unit. XDi 96 has one extension slot, and XDi 144 and XDi 192 have two slots. This is a very flexible way of
extending the XDi CAN bus interface with additional analogue or digital inputs.
(Drawing
–
XDi unit - exploded view main unit with options)
The XDi 96 has one slot for an extension module, where XDi 144 and XDi 192 have two extension slots and can
therefore be equipped with two extension modules.
Input can be extended with analogue or digital inputs, and it is possible to have the XDi configured with relay or
NMEA0183 (IEC61162-1) output.
Extension modules are in addition to the two CAN bus ports, and input data from the extension module will be
shared on the CAN bus as defined in the product or VI-setup profile.
The data sharing on CANopen can either use XDi-Net format and/or CANopen TPDO or RPDO.
The selected virtual indicator using the data from the extension module will scale input data and share them on
CAN if it is set up in the VI-setup profile (VS).
This means, that in a system with multiple indicators presenting the same data, only one XDi needs to be equipped
with extension module(s) and sharing data on CAN. The rest of the XDi units can receive those shared data via
CAN.
Slot 2 Slot 1
