166 Operating Instructions Combics CAIXS2
FM Certificate
FM APPROVALS PROJECT NO: 3049923
Page 5 of 10
CAIXS2-ab Intrinsically Safe Indicator
IS / I, II, III / 1 / ABCDEFG / T4 – Entity 66015-751-07
I / 1 / AEx ia IIC / T4 Entity 66015-751-07
a = U or V or blank
b = blank or up to three numbers (not relevant to safety)
Specific Conditions of Use
1. The front panel of the intrinsically safe indicator type CAIXS2-…. is non-metallic
and shall not be used where UV light or radiation may impinge on the enclosure.
2. The device shall be installed in such a way that it is protected against the entry of
solid foreign objects or water capable of impairing the safety of the apparatus. Reduce
the risk of mechanical damage to a minimum.
Electrical Parameters
Connections to the DC Supply Adapter Cable
Circuit Ui Ii Pi Ci Li
V_1 12.6 V 133 mA 1.46 W 188 nF 0.0 mH
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***
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