SIEMENS 6QM1426 Temperature Transmitter Module:
The 6QM1426 is a temperature transmitter module from Siemens, part
of the SIMATIC S7-1200/1500 automation system. It converts
thermocouple (TC) or resistance thermometer (RTD) signals into
standardized digital outputs (e.g., 4–20 mA, PROFINET, or HART) for
PLC integration. Designed for industrial temperature measurement,
this module ensures high accuracy, reliability, and flexibility in
harsh environments.
Key Features:
Dual-Channel Input: Supports 2 thermocouples (TC) or 2 RTDs (e.g.,
Pt100, Pt1000) for redundant or multi-point measurements.
Signal Conditioning: Cold-junction compensation (CJC) for
thermocouples and linearization for RTDs.
High Accuracy: ±0.1°C (RTD) or ±0.5°C (TC) for precise temperature
control.
Flexible Outputs:
Analog (4–20 mA, 0–10 V)
Digital (PROFINET, HART)
Isolation: Electrical isolation between channels and PLC for noise
immunity.
Diagnostics: Built-in error detection (e.g., open circuit, sensor
break).
Compact Design: Fits into standard S7-1200/1500 I/O racks.
Technical Specifications:
| Parameter | Details |
|---|
| Model | 6QM1426 |
| Compatibility | Siemens S7-1200/1500 PLC series |
| Input Types | Thermocouple (TC: K, J, T, etc.) or RTD (Pt100, Pt1000) |
| Channels | 2 (independent or redundant) |
| Accuracy | ±0.1°C (RTD), ±0.5°C (TC) |
| Resolution | 16-bit (0.01°C for RTD) |
| Output Options | Analog (4–20 mA, 0–10 V), PROFINET, HART |
| Isolation | 1.5 kV (channel-to-channel, channel-to-power) |
| Operating Temperature | -25°C to +70°C (-13°F to +158°F) |
| Power Supply | 24 VDC (from PLC backplane) |
| Dimensions (W × H × D) | ~35 × 125 × 115 mm (1.38 × 4.92 × 4.53 in) |
| Approvals | CE, UL, cULus |
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