Technical data
ABB Safety Handbook | 2TLC172001C0202 5/12
5
Three connection alternatives
According to PLe (ENISO13849-1), connection of sensors/
adaptor units in the Vital safety circuit must be made as the
connection examples.
Example
Use separate connection cables from each sensor/adaptor
unit to the Vital safety controller. Interconnections to be made
via suitable terminals in the control cabinet.
Example
Use Tina4A/Tina8A connector blocks to simplify the connec-
tion of externally mounted sensors/adaptor units. Only Tina4A/
Tina8A connector blocks may be used. Use of any other con-
nector blocks will not meet the safety circuit requirements.
Example
Use M12-3A and M12-3B ’Y’ connectors to connect sensors
in series/parallel.
Cable lengths and number of sensor/adaptor units for the
three connection examples.
In order to determine the number of sensor/adaptor units that
can be connected to a Vital 1 unit it must be remembered that
1 (one) Spot T/R is equivalent to 5 (five) Eden or Tina units.
Units in parallel are equal to one unit. The following examples
provide guidance as to possible configurations and cable
lengths using suitable cables.
Example
Up to 1000 metres (0.75 mm
2
or 0.34 mm
2
conductors) in
total can be connected to the sensors/units in this example.
The connection is equivalent to 9 Eden or Tina units.
A maximum of 30 Eden or Tina units can be connected to
the Vital 1 unit on a maximum cable length of 500 metres
(0.75 mm
2
conductors) or 300 metres (0.34 mm
2
conductors).
Example
Up to 600 metres (0.75 mm
2
conductors) to Tina 8A and
10 metre cables type M12-C1012 (0.34 mm
2
) to each sensor/
unit connected to the Tina 8A. This connection example is
equivalent to 17 Eden or Tina units.
A maximum of 3 Tina 8A units, equivalent to 27 Eden/Tina
units (= 3 x 8 connected to Tina 8A + 3 Tina 8A) can be con-
nected to one Vital 1 with a total cable length of 600 metres
(0.75 mm
2
). Up to 6 Tina 4A units can be connected to one
Vital 1 (equivalent to 30 Eden/Tina units) with a total cable
length of 600 metres (0.75 mm
2
) to Tina 4A.
Example
Either 2 x 500 metre cables (0.75 mm
2
) from the control
cabinet and 10 metre cables (0.34 mm
2
) to each sensor/unit
or 2 x 10 metre cables (0.75 mm
2
) from the control cabinet
and 200 metre cables (0.75 mm
2
) to each sensor/unit. The
connection is equivalent to 16 Eden or Tina units.
A Total of 30 Eden/Tina units can be connected using a
maximum cable length of 1000 metres (0.75 mm
2
) or 400me-
tres (0.34 mm
2
). If the power supply is only fed from one
direction (from one end of the network) the total cable length
is reduced to approx 300 metres (0.75 mm
2
) and 100 metres
(0.34 mm
2
).
Connection advice for dynamic sensors to Pluto and Vital.
Sensors can be connected in many different ways. Here is
some advice that can make connection better and more stab-
le. The advice is general, but particularly applicable to the use
of Tina 4A and Tina 8A units.
– Never have more than the recommended number of sen-
sors in the loop.
– If possible use a switched mains power supply that can
deliver a stable 24 VDC.
– In the sensor system, use as short cables as possible.
– When connecting a Tina 4A or Tina 8A unit, the supply
voltage at the terminal (out at the unit) must not be less
than 20 Volts.
– Use screened cable, preferably 0.75 mm
2
or thicker, from
the apparatus enclosure and ground it at one end, for ex-
ample at the apparatus enclosure, not at both ends.
– Do not route the signal wiring close to heavy current
cabling or close to equipment that gives off a lot of interfe-
rence, such as frequency converters for electric motors.
– Never connect “spare” conductors.
– If M12-3B are used for connection of a parallel loop, with
supply to the sensors from two directions, the loop must
be as short as possible. This is because the conductors
that are not being used are also connected, which incre-
ases the capacitive load and reduces the stability of the
system.