Norcontrol Data Chief C20 DPUs PSS Process Segment Starcoupler
Process Segment Starcoupler
CAN lines are vulnerable against short circuit and
unterminated lines. A short-circuit or a broken
line will disable the entire CAN segment. The PSS
will protect two sections of a CAN segment from
each other. A typical application is to protect
CAN segments running across fire- or flod-zones.
Each terminal on the PSS is based on the ISO
11898 standard, with optical isolation. The PSS
module also protects the terminals against
dominant bits that are not part of a CAN message.
Thus short-circuit or malfunction on one CAN
terminal does not affect the other CAN terminals.
The maximum length of one CAN segment is
530m when the communication is running at
125kBaud. A segment going through a Process
Star Coupler is limited to 515m. This length is the
maximum line length between any two units in the
CAN segment. The application in Fig. 2 is a
typical application where the total line length of
the CAN segment is more than 530m, but the
length from the PSS to each dual Process Segment
Controller (dPSC) is less than 250m. For this
reason it is advised to use the PSS to split two
sections of a process segment, where the segment
is running through rough environment.
Each section of the CAN segment is terminated
with a 120 ohm resistor. The PSS is not seen by
the alarm system or any other software.
Functions • Protection of sections in a single CAN segment • Extension of bus topology
Features • No configuration • No serviceable parts • All connections plugable
Nominal 4 W Maximum 5 W
Ambient operational temperature:
Max. temp. range: –15°C to +70 °C
Max. rel. Humidity: 96% non-condensing
Dnv class B
IACS E10 (allows direct mounting on engines,
compressors, etc. )
According IACS E10 EN60945
Ambient storage temperature: -25°C to +70°C
Weight of module: 1 kg
Mounting: Screws, 4 pcs M5
Connections, plugable screw terminals: Power 1 terminal 2.5 mm2 CAN bus A 8 terminals 2.5 mm2
Specification: Isolation power port: 50 VDC continuos 50 VAC 1 minute.
Isolation: Power: Complete isolated (DC/DC converter)
CAN: Complete isolated (opto coupler) CAN Compatible: 8 CAN interface channels. Using CAN controllers ISO/DIS 11898 high speed physical interface with optical isolation.
DNV, LRS, BV, GL, RINA, NK, ABS, KR, PRS,
MRS (Russia), CCS (China)
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