168 Operating Instructions Combics CAIXS2
FM Certificate
FM APPROVALS PROJECT NO: 3049923
Page 7 of 10
V_2 12.6 V 133 mA 1.46 W 3 nF 0.0 mH
V_3 8.6 V 187 mA 1.51 W 391 nF 0.0 mH
V_4 12.6 V 150 mA 1.68 W 223 nF 0.1 mH
Connections to the Data Adapter Board (COM1)
Circuit Ui Ii Pi Ci Li
RS232 12.6 V*/25.2 V** 328 mA*** any 2.2 nF*/0.5nF** 0 mH
RS422 8.6 V 210 mA 0.5 W 0.5 μF 0 mH
RS485 see below see below any 260nF 0 mH
Digital I/O 8.6 V any any 0 μF 0 mH
*: versus ground; **: between the lines; ***: resistively limited
For the RS485 communication
Ui
±12.4 V 12 V 7.2 V
Ii
130 mA*** 164 mA*** 3.3A***
Rmin
95.4 Ω 73.2 Ω 2.2 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 CAIXS2-…. (COM1)
Circuit Uo Io Po Co Lo Lo/Ro
RS232 10.0 V* 101 mA*** 253 mW 3 μF* 3 mH 140μH/Ω
20.0 V** 217 nF**
RS422 5.2 V 290 mA 496 mW 60 μF 300 μH 50μH/Ω
RS485 5.2 V 210 mA*** 263 mW 60 μF 600 μH 125 μH/Ω
Digital I/O 6.0 V 45 mA*** 67 mW 40 μF 20 mH 530 μH/Ω
Input/Output parameters for the WP Board
Circuit Uo Io Po Co Lo Lo/Ro
RS485 5.4 V 74 mA*** 183 mW 50 μF 600 μH 135 μH/Ω
Ui Ii Pi Ci Li
±12.4 V 130 mA*** † 260 nF 0 mH
12.0 V 164 mA***
6.0 V 3.3 A***
***: resistively limited
†; Any. The input power from the SIWXS… or ISX… is not critical to the CAISX2-…. as
the circuit is resistively limited at the input. A consideration only need 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 ±12.4V 12.0V 6.0V
Rmin 95.4Ω 73.2Ω 2.2Ω
Circuit Uo Io Po Co Lo Lo/Ro
RS232 10.8 V* 110 mA*** 295 mW 2.14 μF 2 mH 120 μH/Ω
21.6 V** 55 mA 174 nF
Ui Ii Pi Ci Li
12.6 V* 328 mA*** † 3 nF 0 mH
25.2 V** 0.5 nF
*: versus ground; **: between the lines; ***: resistively limited
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