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Annex to IECEx FME 13.0005X issue No.:8
†: Any; The input power from the SIWXS... or ISX... is not critical to the CAIXS2-.... As the circuit is
resistively limited at the input. A consideration only needs to be taken for the cable parameters and
that will be defined by the SIWXS... or ISX....
Rmin of the external intrinsically safe circuit is defined by Ui/Ii and is:
Ui
+12.6V
12.0V
Rmin
95.4 Ω
73.2 Ω
Circuit
Uo
Io
RS232
10.8 V*
110 mA***
21.6 V**
55 mA
Ui
Ii
12.6 V*
328 mA***
25.2 V**
*: versus ground; **: between the lines. ***: resistively limited
†: Any; The input power from the SIWXS... or ISX... is not critical to the CAIXS2-.... As the circuit is
resistively limited at the input. A consideration only needs to be taken for the cable parameters and
that will be defined by the SIWXS... or ISX....
DMS Front End Board
Uo
Io
Po
11.8 V
147 mA
1.49 W
Connections to the UNICOM RS Board
Circuit
Ui
RS232
12.6 V*/25.2 V**
RS422
8.6 V
RS485
see below
*: versus ground; **: between the lines; ***: resistively limited
For the RS485 communication:
Ui
±12.6 V
Ii
135 mA***
Rmin
95.4 Ω
RS485 (Rmin = Ui/Ii is the minimum output resistance of the combined circuits of the associated
apparatus connected to the CAIXS2-....)
Output parameters of the UNICOM RS Board
Circuit
Uo
Io
RS232
10.0 V*
101 mA***
20.0 V*
RS422
5.2V
165 mA
FM Approvals Ltd.
1 Windsor Dials,
Windsor, Berkshire, UK. SL4 1RS
T: +44 (0) 1753 750 000 F: +44 (0) 1753 868 700
www.fmapprovals.com
6.0V
2.2 Ω
Po
Co
295 mW
2.14 µF
174 nF
Pi
Ci
†
3 nF
0.5 nF
Co
Lo
770 nF
300 µH
Ii
Pi
328 mA***
any
210 mA
0.5 W
see below
any
12 V
7.2 V
164 mA***
any
73.2 Ω
0
Po
Co
253 mW
3 µF*
217 nF**
292 mW
60 µF
Page 2 of 3
Lo
Lo/Ro
2 mH
120 µH/Ω
Li
0 mH
Ci
Li
0 µF
0 mH
11.22 µF
0 mH
0 µF
0 mH
Lo
Lo/Ro
3 mH
140 µH/Ω
1 mH
75 µH/Ω
Instrucciones de manejo Combics CAIXS2
IECEx certificado
149
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