- Brand: Siemens
- Model: SIMATIC S7-300 SM331 Analog Input Module
- Type: 8-Channel Analog Input Module
- Part Number: 6ES7 331-7KF01-0AB0
- Technical Specs:
- Core Application: Converts analog process signals into digital values for evaluation by the S7-300 CPU backplane bus.
- Predecessor Note: Functional predecessor to the 6ES7 331-7KF02-0AB0 module; shares basic pinout and physical form factor, but differs in firmware generation and noise immunity filters.
- Number of Analog Inputs: 8 Inputs
- Input Signal Ranges (Configurable):
- Voltage: ±80 mV, ±250 mV, ±500 mV, ±1 V, ±2.5 V, ±5 V, 1 to 5 V, ±10 V
- Current: ±3.2 mA, ±10 mA, ±20 mA, 0/4 to 20 mA
- Resistance: 150 Ω, 300 Ω, 600 Ω
- Thermocouple / RTD: Pt100, Ni100, Cu10, Thermocouples (Types E, J, K, L, N)
- Measuring Principle: Integrating / Analog-to-Digital Conversion (ADC)
- Resolution (per channel): 9 to 14 bits + sign
- Conversion Time per Channel: 2.5 ms to 100 ms
- Interference Voltage Suppression: 400 Hz, 60 Hz, 50 Hz, or 10 Hz
- Range Measuring Cards (Measuring Range Modules): 4 removable physical coding cubes (A, B, C, D) mounted on the side of the PCB to select input types (Voltage, Current, RTD, TC)
- Operational Limits / Precision: ±0.5% operational error limit (voltage/current), ±0.6% (RTD/TC) across full temperature range
- Isolation: Galvanically isolated from backplane bus and load voltage (Tested at 500 V DC)
- Permissible Input Voltage/Current Max: 30 V DC continuous (Voltage inputs) / 40 mA continuous (Current inputs)
- Front Connector Required: 1x 20-pin terminal connector block (6ES7392-1AJ00-0AA0, ordered separately)
- Supply Voltage (L+): 24 V DC
- Backplane Bus Current Consumption: Max. 60 mA
- Power Loss: Typ. 1.0 W
- Diagnostic / Status Indicators: Integrated Red "SF" (System Fault) LED + diagnostic reporting to CPU (wire break, parameter assignment error, limit overflow)
- Compatible Systems: SIMATIC S7-300, ET 200M distributed I/O stations
- Structural Mounting Format: Direct screw attachment to standard SIMATIC S7-300 DIN mounting rails
Weight: 320 g
Dimensions: 40 x 125 x 120 mm
Country of Origin: Germany
HS Code: 8538.90.91