6ES7331-7PF01-0AB0 Siemens SIMATIC S7-300 Analog Input SM331 8AI

6ES7331-7PF01-0AB0 Siemens SIMATIC S7-300 Analog Input SM331 8AI

1.Overview of the 6ES7331-7PF01-0AB0 Siemens

The Siemens 6ES7331-7PF01-0AB0 is a high-performance analog input module, a key component of the Siemens SIMATIC S7-300 series PLCs. This module features a potential-isolated design and supports eight analog input channels, specifically designed for connecting various resistance sensors and RTDs. Its high 16-bit resolution (internal 24-bit) and 50ms conversion time ensure accurate and reliable process signal acquisition. This module is primarily used in industrial automation control systems for precise acquisition and processing of analog process signals, and is suitable for a variety of applications, including chemical, electronics, and transportation.

Input Channels: 8 differential analog inputs, all for RTDs (Pt100, Pt200, Pt1000, Ni100, Ni200, Ni500, Ni1000, Cu10, etc.).
Resolution: 16-bit, guaranteeing 0.1°C temperature resolution.
Sampling Period: Typical 50 ms (8-channel cycle), meeting the real-time requirements of most process control systems.
Wire Break/Short Circuit Detection: Channel-level diagnostics allow the PLC to directly read fault bits, reducing downtime and troubleshooting.

2.Core Features:

Item Parameters:
Model 6ES7331-7PF01-0AB0
Series SIMATIC S7-300
Module Type SM331 Analog Input Module
Number of Input Channels 8 Analog Inputs (8AI)
Connection Method Supports 2-, 3-, or 4-wire connections
Input Types Resistor, Pt100/200/1000, Ni100/120/200/500/1000, Cu10, etc.
Resolution 16-bit (two's complement)
Conversion Time 50 ms
Power Supply 24V DC (with reverse polarity protection)
Backplane Bus Current Maximum 100 mA (5V DC)
Power Consumption Typical 4.6 W
Isolation Test 500V DC
Dimensions (L × W × H) 120 mm × 40 mm × 125 mm
Weight Approximately 272 g
Operating Temperature 0°C to 60°C
Relative Humidity 5% to 95% (no condensation)

High-Precision Temperature Measurement: Supports a variety of RTD types, including Pt100, Pt200, Pt1000, Ni series, and Cu10, making it suitable for various industrial temperature monitoring scenarios.
High Resolution: 16-bit A/D conversion accuracy and temperature resolution up to 0.1°C meet high-precision control requirements.
Multiple Wiring Methods: Supports 2-, 3-, and 4-wire wiring methods, allowing users to flexibly choose based on site conditions to improve measurement accuracy.
Modular Design: Standard S7-300 module size and plugs directly into DIN rails for easy system integration and expansion.
Isolation Protection: Electrical isolation between input channels and from the backplane bus improves system interference immunity.
Diagnostics: Supports channel-level fault detection and status indication, facilitating maintenance and debugging.
Software Configuration: Parameter setting and debugging are performed using STEP 7 software, eliminating the need for hardware jumpers and ensuring convenient operation.

3.Product details pictures

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