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14
Technical data
14.1 Power supply
Nominal voltage for the AA units 1736 is 24 V DC.
The number of AA units
dependent on all other units connected to the same RS485 line and cable type
(i.e. the current consumption).
As an alternative, the units can be power supplied from an external power
supply.
14.2 RS485
The AA units communicate with the C.I.E. via RS485, i.e. in system FT512 via
the "External FBP / DU interface board" 1587 (data rate 9600 baud) mounted
in the C.I.E. and in system FT128 via the "RS485 transceiver component
4552" plugged on the mother board in the C.I.E.
In system FT1020G3 the required components are mounted on the main
board as a standard feature.
In the last unit on the line, a termination resistor (120R) has to be connected.
In the AA units 1736 this is done via jumper "JP8". ("JP8" mounted = the
termination resistor is connected.)
14.2.1 Cable
The cable to be used in systems FT512 and FT1020G3 should be Twisted
Pairs 2 x 2 x 1 mm2 (screened - tinned copper braid). Cable length up to 1200
m (theoretically) depending on the cable type but the cable length is also
dependent on the current consumption, i.e. the type and number of units
connected. For more details regarding cable type and current consumption,
refer
to
NOTE! In system FT128 the screen is not used / connected.
A twisted pair not screened cable can then be used.
14.3 RS232
The AA units are equipped with an RS232 interface (J2), which makes it
possible to download new SW directly to the AA unit respectively.
14.4 Connection
The AA units are equipped with a plug-in terminal block (J1) for the cable
connections. Up to 1.5 mm
14.5 Current consumption
The current consumption is depending on the type of units and the actual
voltage on the line.
18
Allowed voltage is 12 – 30 V DC.
19
On each 1587 board are up to sixteen addresses available.
19
that can be power supplied from the C.I.E. is
the
technical
2
conductor area can be used.
29
Technical Description
AAU 1736 – Rev 1
18
manual
of
each
system.
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