Application Scenarios
A 600 MW coal-fired power plant in eastern China was facing increasing nuisance alarms and intermittent control deviations due to aging analog input cards in their Teleperm M-based turbine control system. The original modules suffered from contact oxidation, signal drift, and occasional channel failures, forcing operators to bypass critical protection interlocks—a practice that raised serious safety concerns.
After replacing the faulty units with the Siemens 6DS1723-8BB, the plant immediately observed a 60% reduction in signal noise and a 40% improvement in measurement stability across all 8 channels. The integrated open-circuit detection feature alerted operators to a failing thermocouple before it could cause a process deviation, enabling predictive maintenance rather than emergency response. Plant engineers reported that the 6DS1723-8BB restored full protection system functionality within a single scheduled outage, with zero signal-related trips in the following 12 months .
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 6DS1723-8BB |
| Manufacturer | Siemens (Germany) |
| Product Category | Universal Analog Input Module (Teleperm M Series) |
| Input Channels | 8 (differential/single-ended configurable) |
| Supported Signal Types | 0/4-20 mA, 0-10 V, ±10 V, Thermocouple (K/J/S/T), Pt100, Ni100, Cu10, Potentiometer (0-5 kΩ) |
| A/D Resolution | 12-bit + sign bit |
| Measurement Accuracy | ±0.1% to ±0.5% FS (depending on signal type and temperature) |
| Isolation | 2.5 kV test voltage, channel-to-ground isolated |
| Open-Circuit Detection | Supported (current and resistance inputs) |
| Conversion Time | 10-50 ms per channel (configurable) |
| Power Supply | 24 V DC (backplane-powered, typical ≤ 8 W) |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -25°C to +70°C |
| Protection Class | IP20 (cabinet installation) |
| Compatible Racks | Teleperm M AS220/AS230/AS235 cages |
| Weight | Approx. 0.4 kg |
Technical Principles and Innovative Values
Innovation Point 1: Universal Signal Conditioning with Intelligent Linearization
The Siemens 6DS1723-8BB incorporates a flexible front-end amplifier array that automatically configures gain and input impedance based on the selected signal type. This eliminates the need for external signal conditioners or shunt resistors, reducing cabinet footprint by 30% compared to single-function input cards. The internal A/D converter performs real-time linearization for thermocouple and RTD inputs using factory-calibrated polynomial algorithms, achieving temperature measurement accuracy within ±0.1% of full scale .
Innovation Point 2: High-Noise Immunity with Integrated EMI Filtering
Unlike standard analog input modules that require external filtering components, the 6DS1723-8BB features on-board EMI suppression and 2.5 kV opto-isolation between input channels and the system bus . In field tests at a steel mill with heavy VFD loads, the module maintained measurement stability within ±0.05% drift over 72 hours of continuous operation, outperforming competitive modules by 3x in signal-to-noise ratio .
Innovation Point 3: Open-Circuit and Sensor Fault Detection
The 6DS1723-8BB continuously monitors each input channel for open-circuit conditions, short circuits, and out-of-range values. When a sensor failure is detected, the module flags the fault to the Teleperm M controller within one scan cycle (100 ms typical), enabling automatic failover to backup sensors or safe-state actuation . This feature reduced unplanned downtime by 45% in a chemical plant case study, where thermocouple failures were historically identified only during routine calibration rounds .
