

| Product Code | PLC500-ET51A4 | PLC500-ET51A8 |
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Physical Characteristics |
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| Dimension (W×H×D) | 34 × 115 × 100 mm | |
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Power |
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| Rated input voltage | 24 V DC | |
| Input voltage range | 20.4 V~28.8 V DC | |
| Input current | 50 mA | |
| Reverse polarity protection | Yes | |
| Bus power voltage | +5 V DC | |
| Bus power current | 50 mA | |
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LED Indicator |
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| 24V power LED | On: 24 V DC normal power, Off: 24 V DC Power Unavailable | |
| SF LED | On: System down, Off: Normal, Flash: Input signal error | |
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Input Features |
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| Input type | Suspension-type thermocouple | |
| Number of inputs | 4 | 8 |
| Wiring | - | |
| Input Range | Thermocouple type (choose one): S, T, R, E, N, K, J. Voltage range: ± 80 mV. Default: K | |
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Isolation |
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Field to Logic Site to 24 V DC 24 V DC to logic |
500 V AC 500 V AC 500 V AC |
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| Common Mode Rejection | >100 dB @ 120 V AC | |
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Input resolution |
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Temperature Voltage Resistance |
0.1℃ / 0.1℉ - 15 + sign bit |
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| Measuring principle | Sigma-Delta | |
| Module update frequency (all channels) | 4 channel support 8Hz, 4Hz, 2Hz, 1Hz configured, default : 2Hz all channels | |
| 8 channel support 4Hz, 2Hz, 1Hz, 0.5Hz configured, default : 2Hz all channels | ||
| length of wire to sensor | Max. 100m | |
| Wire loop resistance | 100 Ω | |
| Noise suppression | 85 dB @ 50 Hz / 60 Hz / 400 Hz | |
| Data word format | Voltage: -27648 ~ +27648 | |
| Input impedance | >10 MΩ | |
| Maximum input voltage | Inputs can support a maximum voltage to 30 V DC of misconnection | |
| Resolution | 15bit + sign bit | |
| Input filter attenuation | -3 dB @ 21 KHz | |
| Basic error | 0.1% Fs (voltage) | |
| Repeatability | 0.05% Fs | |
| Cold junction compensation | Can be configured, default: yes | |
| Cold junction error | ±1.5℃ | |
| Temperature Unit | Celsius / Fahrenheit can be configured, default Celsius | |
| Break detection | Configuration available, Support both positive and negative directions calibration, default positive calibration | |
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Diagnostic |
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| Break | 32767 (positive calibration), -32768 (negative calibration) | |
| No module supply | 32766 | |
| With integrated PID control function | No | |