Description
The Siemens 6ES7231-5QA30-0XB0 is a Signal Board (SB) designed for the SIMATIC S7-1200 PLC family. This specific model is a 2-channel digital input module that plugs directly into the front of the S7-1200 CPU, occupying the onboard expansion slot. It provides two additional 24V DC digital inputs without consuming space in the main I/O rack. Featuring a compact design, it is ideal for adding a few extra signals (e.g., emergency stop, mode selector, or sensor feedback) to a compact CPU where a full-size SM module would be overkill. It supports standard 24V DC sinking/sourcing inputs and is fully integrated into the TIA Portal engineering software.
Key Features
- SIMATIC S7-1200 Signal Board (SB 1221)
- Type: 2-Channel Digital Input (DI)
- Input Voltage: 24V DC (Sink/Source)
- Connection: Direct plug-in to CPU front connector
- Isolation: 500V AC (Channel-to-Bus)
- Status Indication: LED per channel
- Compatibility: All S7-1200 CPUs (firmware V4.0+)
- Configuration: Integrated in TIA Portal
- Country of Origin: Germany / China (Siemens OEM)
Technical Specifications
- Article Number: 6ES7231-5QA30-0XB0
- Supply Voltage: 24 V DC (from CPU backplane)
- Input Current: Typically 3 mA per channel
- Input Delay: 0.1 ms / 0.8 ms / 3.0 ms (configurable)
- Input Logic: 1 at 15-30V DC, 0 at -3 to +5V DC
- Housing Material: Plastic (PC)
- Dimensions: 38 mm × 62 mm × 22 mm (W×H×D)
- Weight: approx. 30 g
- Connection Type: Screw terminal block (included)
- Protection Class: IP20
- Operating Temperature: 0°C to +55°C
- Standards: CE, cULus, RoHS compliant
Warranty & After-Sales
- Factory new units: 12 months warranty (Siemens original)
- Refurbished units: 3-6 months warranty
- Technical support for TIA Portal hardware configuration
- Wiring diagram assistance for 2-wire sensors
- Diagnostics and fault-finding support
Delivery Time
- Standard delivery: 3-5 working days
- Express shipping available upon request
Why Choose Our Store
- 100% Genuine Siemens components with original packaging
- Global supply network with competitive pricing
- Expertise in Siemens automation systems (S7-1200/1500)
- Comprehensive technical documentation (manual, datasheet)
- Responsive customer service and support
Applications
- Adding extra limit switches or pushbuttons to a compact S7-1200 station
- Emergency stop (E-Stop) input expansion
- Machine mode selector (Auto/Manual/Jog) inputs
- Small-scale automation upgrades without a rack
- Replacement for damaged onboard CPU inputs
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