Description
The Siemens 6ES7331-1KF01-0AB0 is an SM 331 Analog Input module for the SIMATIC S7-300 PLC rack, providing 8 differential analog input channels with optical isolation, supporting voltage (±10V, ±5V, ±2.5V, 1–5V), current (0/4–20mA), and resistance (RTD — via 4-wire/3-wire/2-wire with compensation, thermocouple via ext. CJC reference or with 7HFxx version) inputs. The related models cover different channel counts, resolutions, and measurement types:
- 6ES7331-1KF01-0AB0 / 1KF02-0AB0 → 8 AI channels, 13-bit + sign (14-bit total), Voltage/Current/Resistance (RTD w/ compensation — no TC direct on -1KF0x unless via ext. transmitter or 7HFxx)
- 6ES7331-7HF01-0AB0 → 8 AI channels, 14-bit + sign (15-bit total), adds Thermocouple (TC) & Resistance thermometer (RTD) direct measurement with built-in CJC — higher resolution than -1KF0x
- 6ES7331-7PF01-0AB0 → 8 AI channels, 16-bit (high-resolution), TC/RTD direct, faster conversion — for high-precision process measurement
All SM 331 modules plug into the S7-300 central rack (or distributed via IM 153-1/2 in ET 200M) and are configured in STEP 7 / TIA Portal — measuring range, smoothing (averaging), and diagnostic interrupts are set via hardware configuration.
Key Features
- Inputs: 8 × differential analog inputs (isolated group — 2 groups of 4 channels share common return per group on -1KF0x/7HF0x)
- Measured Values: Voltage (±10V etc.), Current (0/4–20mA), Resistance (2/3/4-wire RTD — 7HFxx & 7PFxx directly; -1KF0x needs ext. conversion or 3-wire with compensation), Thermocouple (7HFxx / 7PFxx — with CJC)
- Resolution: 13-bit + sign (1KF0x) / 14-bit + sign (7HF0x) / 16-bit (7PF0x)
- Isolation: Optical isolation between bus & analog circuitry (≥ 500 V AC typical)
- Diagnostic: Wire-break detection (for current mode), overflow/underflow flags, module fault LED (SF)
- Country of Origin: Germany / Hungary / China (Siemens Global)
Model & Capability Table (S7-300 SM 331 Analog Input Modules)
Model | Channels | Resolution | Direct TC/RTD? | Typical Use |
|---|---|---|---|---|
6ES7331-1KF01-0AB0 / 1KF02-0AB0 | 8 AI | 13-bit + sign (≈ 0.3% FS) | ❌ No (RTD via linearization; TC needs ext. transm./7HFxx) | Std. voltage/current signals (flow/pressure tx) |
6ES7331-7HF01-0AB0 | 8 AI | 14-bit + sign (≈ 0.15% FS) | ✅ Yes (TC Type J/K/T/E/S/R/B/N; RTD Pt100/Ni100 etc.) | Temp. meas. + analog — built-in CJC |
6ES7331-7PF01-0AB0 | 8 AI | 16-bit (high-res) | ✅ Yes (TC/RTD) | High-precision lab/metallurgy temp./analog |
6ES7331-7NF00-0AB0 | 8 AI (Fast) | 14-bit + sign | ❌ (fast version — no TC/RTD) | Fast cyclic AI (≤ 1.25 ms/conversion) |
⚠️ Important Selection Notes:
Technical Specifications (Representative — 6ES7331-1KF01-0AB0, 8 AI, 13-bit+sign)
Parameter | Specification |
|---|---|
Model / Order Code | 6ES7331-1KF01-0AB0 (Siemens SM 331 Analog Input 8×AI) |
No. of Channels | 8 differential inputs (grouped 4+4 — 2 common returns M0-, M4-) |
Input Ranges (Software Selectable) | Voltage: ±10 V, ±5 V, ±2.5 V, 1–5 V; Current: 0–20 mA, 4–20 mA; Resistance: 2-wire/3-wire/4-wire RTD (linearization — no TC) |
Resolution | 13-bit + sign (14-bit total incl. sign) — conversion time ~ 40–260 ms (selectable averaging) |
Accuracy | ± 0.6 % of FS (typical @ 25 °C); ± 1.0 % over full temp. range |
Isolation (Bus ↔ Analog) | ≥ 500 V AC (optical) |
Diagnostic Functions | Wire-break (for 4–20 mA), overflow/underflow, group error (SF LED) |
Backplane Current Draw (5V) | ~ 60 mA (typical) |
Front Connector Required | 40-pin (6ES7392-1AJ00-0AA0 = screw terminal; 6ES7392-1BJ00-0AA0 = spring) — order separately |
Mounting | S7-300 rack (central or ET 200M via IM 153) — slot 2–4 in central rack |
Dimensions (W×H×D) | 40 mm × 125 mm × 120 mm (standard S7-300 module width) |
Weight | ~ 0.3 kg |
Standards | CE, UL, cUL, FM (Class I Div 2), RoHS, EN 61131-2 |
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty (analog loopback test on S7-300 test rig)
- Technical support for:
- Module selection (-1KF0x vs -7HF0x vs -7PF0x — do you need TC/RTD direct?)
- STEP 7 / TIA Portal hardware config (measuring range per channel, smoothing factor, diagnostic interrupt enable)
- Wiring diagram (shielded twisted pair, M- connection, separation from digital I/O cables)
- Front connector selection (screw vs spring — 40-pin 6ES7392-1AJ00/1BJ00)
- Scaling (FC105 SCALE_X or TIA NORM_X + MUL — raw 0–27648 ↔ engineering units)
- Cross-reference to S7-1200/1500 analog modules (SM 1231 / SM 1234) if considering migration
Delivery Time
- Standard delivery: 3-5 working days (stock modules)
- Express shipping available upon request
Why Choose Our Store
- Genuine Siemens SIMATIC S7-300 analog modules — not refurbished-clone or gray-market with poor A/D linearity
- Global supply network with competitive pricing
- Expertise in S7-300/400 hardware configuration & analog signal conditioning (shielding, grounding, scaling)
- Comprehensive technical documentation (wiring diagram, measuring range table, STEP 7 screenshot guide)
- Responsive customer service and support
Applications
- Process Signals: Read 4–20 mA from pressure/flow/level transmitters into S7-300 for PID control.
- Temperature Monitoring: With -7HF01 or -7PF01 — direct TC/RTD input (CJC built-in) for furnace/oven/bearing temp.
- Quality Test Stands: High-res analog (-7PF01) for precise voltage/current measurement.
- Retrofit / Spare: Replace faulty SM 331 in existing S7-300 panel — same article number ensures drop-in replacement (transfer HW config from PG).
- Distributed I/O (ET 200M): Mount in ET 200M station with IM 153-1/2 for remote analog acquisition.
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