Excerpt from the datasheet: Technical specifications of the KFD2-SOT3-Ex2.IO
| Main Features | ||
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| Signal type | Digital input | |
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Parameters related to functional safety |
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| Safety Integrity Level (SIL) | Security Level 2 | |
| Systematic ability (SC) | SC 3 | |
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Supply |
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| Connection | Power bus or terminals 14+, 15- | |
| Nominal voltage | 19 ... 30 V DC current | |
| pulsation | ≤ 10% | |
| Rated current | 30 ... 20 mA | |
| Power dissipation | ≤ 1.1 W including maximum output power dissipation | |
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Entrance |
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| Connection side | side of the field | |
| Connection | terminals 1+, 2+, 3-; 4+, 5+, 6- | |
| Nominal values | according to EN 60947-5-6 (NAMUR), for electrical characteristics see manual | |
| Open circuit voltage/short circuit current | OK. 10 V DC current / approx. 8 mA | |
| Switching point/switching hysteresis | 1.2 ... 2.1 mA / approx. 0.2 mA | |
| Line fault detection | open circuit I ≤ 0.1 mA, short circuit I ≥ 6.5 mA | |
| Pulse/pause ratio | min. 100 µs/min. 100 µs | |
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Exit |
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| Connection side | control side | |
| Connection | output I: terminals 7, 8; output II: terminals 10, 11 | |
| Nominal voltage | 30 V DC | |
| Rated current | 100 mA, short circuit protection | |
| Response time | ≤ 200 µs | |
| Signal level |
1-signal: (external voltage) - 3 V max for 100 mA 0-signal: output blocked (off-state current ≤ 10 μA) |
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| Exit I | signal; transistor | |
| Exit II | signal; transistor | |
| Collective error message | Power bus | |
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Transmission characteristics |
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| Switching frequency | ≤ 5 kHz | |
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Galvanic isolation |
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| Input, output | reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V eff. | |
| Input/Power | reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V eff. | |
| Output/Power | Basic insulation according to IEC/EN 61010-1, rated insulation voltage 300 V eff. | |
| Exit/Exit | basic insulation according to IEC/EN 61010-1, rated insulation voltage 60 V eff. | |
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Indicators/settings |
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| Display elements | LEDs | |
| Controls | DIP switch | |
| Configuration | via DIP switches | |
| Marking | marking space at the front | |
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Compliance with the directive |
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| Electromagnetic compatibility |
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Directive 2014/30/EU | EN 61326-1:2013 (industrial premises) |
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Correspondence |
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| Electromagnetic compatibility | NE 21:2012, EN 61326-3-2:2008 | |
| Degree of protection | IEC 60529:2001 | |
| Entrance | EN 60947-5-6:2000 | |
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Environmental conditions |
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| Ambient temperature | -20 ... 60 °C (-4 ... 140 °F) | |
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Mechanical characteristics |
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| Degree of protection | IP20 | |
| Connection | screw terminals | |
| weight | approx. 150 g | |
| Dimensions | 20 x 119 x 115 mm (0.8 x 4.7 x 4.5 in) (W x H x D), case type B2 | |
| Installation | on a 35 mm DIN rail in accordance with EN 60715:2001 | |
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Data for use in hazardous areas |
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| EU Type Examination Certificate | EXA 16 ATEX 0016 X | |
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Marking |
 II 3(1)G Ex nA [ia Ga] IIC T4 Gc II (1)D [Ex ia Da] IIIC I (M1) [Ex ia Ma] I
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Entrance | Ex ia |
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Voltage | 10.5 V |
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Current | 17.1 mA |
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Power | 45 mW (linear characteristic) |
| Supply |
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Maximum safe voltage | 253 V AC (Note: U m is not the nominal voltage.) |
| Exit |
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Maximum safe voltage | 253 VAC (Caution: Nominal voltage may be lower.) |
| Galvanic isolation |
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Input, output | safe electrical insulation in accordance with IEC/EN 60079-11, peak voltage 375 V |
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Input/Power | safe electrical insulation in accordance with IEC/EN 60079-11, peak voltage 375 V |
| Compliance with the directive |
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Directive 2014/34/EU | EN IEC 60079-0:2018+AC:2020, EN 60079-11:2012, EN 60079-15:2010 |
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International certificates |
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| UL approval | E106378 | |
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Control drawing | 116-0424 (cULus) |
| IECEx certification |
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IECEx Certificate | IECEx EXA 16.0009X |
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IECEx marking | Ex nA [ia Ga] IIC T4 Gc, [Ex ia Da] IIIC, [Ex ia Ma] I |