Overview
Manual
Input Architecture
Sensor Configuration
Wiring Guidance
Features:
- Rated value (DC): 24 V; Only required for supplying 2-wire transmitters
- Input current from load voltage L+ (without load), max.: 400 mA; for 16 connected, fully controlled 2-wire transmitters
- Power loss, typ.: 4.5 W
Siemens 6ES7431-7QH00-0AB0 is a SIMATIC S7-400 SM 431 isolated analog input module with 16 channels and 16-bit resolution.
It supports voltage, current, resistance, thermocouple and Pt100 measurement, plus diagnostics and process alarms. A 24 V load supply is required for two-wire transmitters, and signal wiring must follow the official channel grouping and compensation rules.
The product is in Siemens phase-out. Confirm the S7-400 rack, front connector, measurement-range configuration, sensor type and shielding before field replacement.
The Siemens 6ES7431-7QH00-0AB0 may be supplied and supported by Moore Automated according to the official product lifecycle: Active/Available from OEM.
Siemens 6ES7431-7QH00-0AB0 SIMATIC S7-400 SM 431 analog input module Manuals(Datasheets), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, licenses and related items are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Technical details:
- Rated value (DC): 24 V; Only required for supplying 2-wire transmitters
- Input current from load voltage L+ (without load), max.: 400 mA; for 16 connected, fully controlled 2-wire transmitters
- Power loss, typ.: 4.5 W
- Input resistance (0 to 6000 ohms): 1 MΩ
- Resolution with overrange (bit including sign), max.: 16 bit; 16 / 16 / 16
- Isolation tested with: 2 120 V DC between bus and L+/M
SM 431 provides sixteen high-resolution isolated inputs but depends on correct channel grouping, sensor selection, reference-junction handling and shielding. Verify the configured measurement range and external 24 V supply for two-wire transmitters before replacing or commissioning the module.
Compatibility: The Siemens 6ES7431-7QH00-0AB0 is designed specifically for SIMATIC S7-400 automation systems. It is an SM 431 analog input module designed to be installed in a suitable S7-400 rack and used with compatible S7-400 CPUs and system configurations. The 6ES7431-7QH00-0AB0 provides 8 analog inputs; therefore, customers replacing existing analog input modules should verify the signal types, channel configurations, wiring methods, and hardware/software configurations before installation. Compatibility should always be checked against the complete S7-400 system configuration, not just the module number.
Configuration: Before installing the Siemens 6ES7431-7QH00-0AB0, turn off the power and follow applicable S7-400 installation and electrical safety procedures. The module should be correctly installed in the designated S7-400 rack and connected according to the Siemens wiring diagram. Because the 6ES7431-7QH00-0AB0 is an analog input module, special attention should be paid to signal wiring, cable shielding, grounding, and isolation from high-voltage or high-noise circuits. After installation, please correctly configure 6ES7431-7QH00-0AB0 in the STEP 7 hardware configuration and verify the selected input range before commissioning.
Application: The Siemens 6ES7431-7QH00-0AB0 is used to acquire analog process signals in industrial automation systems. This module features eight analog input channels and can be used to monitor pressure, temperature, flow rate, level, speed, or other process measurement variables, provided that the corresponding sensors and signal conditioners can provide compatible analog signals. Typical applications include process control, production lines, machine automation, water treatment, energy systems, and other S7-400-based control systems where multiple analog measurement points need to be integrated into the PLC.
Lifecycle: When purchasing Siemens 6ES7431-7QH00-0AB0, customers should confirm the complete MLFB/order number, product condition, and actual warehouse inventory. The SIMATIC S7-400 series includes many similarly looking analog input modules, so searching only for
SM 431 provides sixteen high-resolution isolated inputs but depends on correct channel grouping, sensor selection, reference-junction handling and shielding. Verify the configured measurement range and external 24 V supply for two-wire transmitters before replacing or commissioning the module.
