Performance Parameters
| Features | SM231：2AI×RTD | SM231：4AI×RTD |
| Order No. | CTH2 231-7PB32 | CTH2 231-7PC32 |
| Physical Features | ||
| Dimension（W×H×D） | 71.3 × 96 × 62mm | 71.3 × 96 × 62mm |
| LED indicator |
24VDC Power supply indicator: ON = no fault, OFF = no power； SF indicator，ON=module fault, Blink=input signal error, OFF=normal; |
|
| Power Consumption | ||
| +5VDC power loss | 87mA | 87mA |
| L+ | 34mA | 37mA |
| L+Coil voltage range | 20.4～28.8VDC | |
| Power Consumption | 1.7W | 1.7W |
| Input features | ||
| Input type | Module refer ground resistance | |
| Input number | 2 | 4 |
| Input range |
Thermal resistance type（choose one）：Pt-100Ω，200Ω，500Ω，1000Ω（α=3850ppm，3920ppm，3850.55ppm，3916ppm，3902ppm） Pt-10000Ω（α=3850ppm） Cu-9.035Ω（α=4720ppm） Ni-100Ω，120Ω，1000Ω（α=6720ppm，6178ppm） R-150Ω，300Ω，600Ω |
|
| Temperature measurement range |
Pt-100Ω，200Ω，500Ω，1000Ω：-200℃～850℃ Pt-10000Ω：-200℃～600℃ NI-0.00672：-80℃～260℃ NI-0.006178：-60℃～300℃ Cu-0.004270：-200℃~260℃ |
|
| Isolation | ||
| Field side to logical circuit | 500VAC | |
| Field side to 24VDC | 500VAC | |
| 24VDC to logical circuit | 500VAC | |
| Common mod input range（input channel to input channel） | 0 | |
| Common mode rejection | >120dB@120VAC | |
| Sample Features | ||
| Temperature resolution | 0.1℃/0.1℉ | |
| Voltage resolution | 15bit+sign bit | |
| Measuring principle | Σ-Δ | |
| Module update time（all channel） | 425ms | 825ms |
| Wire length to sensor | Max 100m | |
| Wire loop resistance | 20Ω，copper line 2.7Ω | |
| Noise suppression | 85dB@ 50Hz/60Hz/400Hz | |
| Data format | ||
| Input impedance | >10MΩ | |
| Max.voltage input | 30VDC，5VDC | |
| Input resolution | 15bit+sign bit | |
| Input filter attenuation | -3dB@21kHz | |
| Error | 0.1% FS（resistance） | |
| Repeatability | 0.05% FS | |
| Analog input addressing | AIW addressing | |
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