Pavone Systems MC 315 Series, Техническое руководство

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USB
+
Fiber Optic Interface
Fiber Optic
RX TX
Options:
Fiber Optic
A Gnd
TX RX
Out An
V Out +
I Out +
S Gnd
RxD
TxD
RS485 -
RS485 +
GND
+ Vdc
+
-
GND
7÷30 Vdc
V+ (10 kΩ min) mA+ (300 Ω max)
RS485
TX-/RX- TX+/RX+
ANALOG
OUTPUT
RS232
RXD TXD SGND A Gnd
Page 10
OPTICAL FIBER CONNECTION
The use of optical fiber communication systems in dangerous zones
offers some advantages in terms of galvanic isolation and use of
low energy.
Galvanic isolation makes it unnecessary to use a barrier, which would
be anyway required between the dangerous and the safe zone in
case of, for example, RS232 or RS485 communication or analogical
output, even if the signals come from an intrinsically safe unit.
The use of diffused-light LEDs, as for the interfaces on this unit, com-
plies with the ATEX norms and, specifically, with norm EN 60079-28.
Two-way optical fiber communication allows to send and receive
data in a safe zone to/from the S318 circuit board; such data is
then switched to Fieldbus, RS485, RS232, analogical outputs, in-out.
The requested cable is a Duplex cable with two fibres inside the
same sheath, with 1mm Plastic Optical Fiber (e.g. COP-1002-HD).
The fiber terminal should be designed according to document
“AV02-0460EN _DS_HFBR-
453xZ_2015-06-18.PDF”
by AVAGO/BROADCOM, and
using connectors of the HFBR-
453xZ series.
The use of two different colours
for the TX and RX, is recommen-
ded, e.g. HFBR-4531Z (black)
for the TX and HFBR-4533Z
(blue, see photo on the right) for
the RX.
The optical fiber could reach a
maximum length of 100m (as from the characteristics) with a very
accurate finish, as specified in the above-mentioned document.
If the finish is not ascertained, a maximum length of 50m is recom-
mended.
The fibers can also be cut with an appropriate cutter (see figure).
S318 CIRCUIT BOARD
The Optical Fiber interface board is contained in a plastic enclosure
with DIN 35mm guide. Its size is 70x90x58mm (LxHxD). While the
board should be powered at the typical voltage rate of 24 VDC,
voltage values between 7 and 30 VDC are also accepted.
The base version of the board features a RS232 serial port and a
RS485 serial port. It is also available with analogical voltage or
current output as an option.
As an alternative to the RS485 serial port, any of the following
FIELDBUS options can be used: Profibus DP, Profinet, Ethercat, or
Ethernet IP.
The configuration of the serial ports, of the analogical output and
of the Fieldbus (if any) is performed directly by the MC 315 unit.