Description
The Siemens SIMATIC S7-1200 SB 1231 6ES7231-4HA30-0XB0 is a high-performance analog input Signal Board (SB) designed to seamlessly expand the capabilities of your Siemens S7-1200 PLC system.
It works by converting external analog voltage signals (such as ±10 V DC) into digital signals that the S7-1200 CPU processes for accurate monitoring and automation control.
Engineers, panel builders, and automation technicians needing a single additional analog measurement point without adding a bulky expansion module (SM) will benefit from this product. In Bangladesh’s growing manufacturing and textile automation sector, this board offers a budget-friendly and compact solution to enhance machine automation without redesigning control panels.
Key Features
- Direct CPU Mounting: Plugs directly into the front slot of the S7-1200 CPU, saving precious DIN rail space inside control cabinets.
- Precise Signal Processing: Supports 1 Analog Input channel capable of handling ±10 V DC inputs for precise data acquisition.
- Seamless TIA Portal Integration: Fully supported in Siemens TIA Portal software for quick hardware configuration and rapid commissioning.
- Robust Industrial Build: Engineered for continuous operating environments, ensuring minimal downtime in factory conditions.
Technical Advantages
- Space Efficiency: Zero additional width added to the controller assembly inside control panels.
- Durable Construction: Industrial-grade housing designed to withstand shop-floor vibration and electrical noise.
- Safety Protection: Built-in isolation circuits safeguard the main CPU against field signal voltage fluctuations.
- Energy Saving: Draws minimal power directly from the CPU’s internal backplane bus.
- Easy Maintenance: Plug-and-play module design enables fast field replacement and hassle-free servicing.
Applications
- Industrial: Factory machinery automation, conveyor system monitoring, and motor drive speed feedback.
- Commercial: HVAC air conditioning damper control, pressure transducer integration, and automated building utilities.
- Project Installation: Ideal for custom industrial control panel fabrication and retrofit upgrades across Bangladesh.
Why Choose This Product?
- Reliability: Manufactured by Siemens, a global leader in industrial automation and process control.
- Performance: High conversion speed and stable signal processing ensure accurate real-time control.
- Cost Effectiveness: Eliminates the expense of purchasing larger, multi-channel Signal Modules (SM) when only one analog input is required.
- After-Sales Value: Supported widely by automation specialists in Bangladesh with long service life and high resale value.
Technical Specification Table
| Specification | Details |
| Model | SB 1231 (6ES7231-4HA30-0XB0) |
| Brand | Siemens |
| Rated Power | Not Available |
| Voltage | ±10 V DC (Input range) |
| Current | Not Available |
| Frequency | Not Available |
| Efficiency | Not Available |
| Protection | IP20 |
| Dimension | Not Available |
| Weight | Approx. 0.04 kg |
| Operating Temperature | −20∘C to 60∘C (Horizontal installation) |
| Warranty | Standard Manufacturer Warranty |
Features List
✓ Space-saving Signal Board (SB) design
✓ 1 Analog Input channel (±10 V DC)
✓ Direct front-slot mounting on S7-1200 CPU
✓ High precision signal acquisition
✓ Native integration with TIA Portal software
Benefits For Customers
- Reduces Cabinet Costs: Saves space inside electrical enclosure panels, lowering overall panel fabrication expenses.
- Improves Operational Reliability: Precise analog readings reduce process errors and protect connected machinery.
- Saves Maintenance Cost: Simple plug-in installation minimizes machine setup and repair time.
- Suitable for Bangladesh Environment: Built to perform reliably in dusty and warm industrial factory environments across Bangladesh.
Installation & Maintenance Guide
Installation Requirements:
- Ensure power supply to the S7-1200 CPU is turned OFF before mounting or removing the Signal Board.
- Remove the front protective cover from the S7-1200 CPU signal board slot.
- Carefully insert the SB 1231 board vertically into the slot until it snaps firmly into place.
- Wire the analog sensor inputs adhering strictly to the Siemens terminal pinout layout.
Maintenance Tips:
- Periodically check terminal block connections for tightness to prevent signal drift caused by loose wiring.
- Keep the control cabinet clean and free from excess dust or moisture accumulation.
- Inspect diagnostic LEDs in TIA Portal to monitor module status during routine maintenance.
Safety Instructions:
- Always isolate mains voltage prior to working on connected field instrumentation.
- Use shielded twisted-pair cables for analog signals to minimize electromagnetic interference (EMI).
Frequently Asked Questions (FAQ)
Q: What is the price of Siemens S7-1200 SB 1231 Analog Input Board in Bangladesh?
A: For the latest competitive price and stock availability of the Siemens SB 1231 in Bangladesh, please visit loopshop.com.bd or contact our sales team.
Q: Where can I buy original Siemens SB 1231 in Bangladesh?
A: You can buy 100% authentic Siemens PLC accessories online at loopshop.com.bd with reliable island-wide delivery in Bangladesh.
Q: What warranty does this product have?
A: This product comes with standard seller warranty options against manufacturing defects. Check loopshop.com.bd product listing for current warranty terms.
Q: Is this suitable for Bangladesh climate?
A: Yes, it features industrial-grade housing and operates reliably up to 60∘C, making it well-suited for humid and warm industrial conditions in Bangladesh.
Q: How to install this product on S7-1200 PLC?
A: Switch off PLC power, pop off the front slot cover on the S7-1200 CPU, insert the SB 1231 board firmly, and configure the module in TIA Portal.
Q: Does SB 1231 require an additional expansion rack or base unit?
A: No, Signal Boards (SB) install directly into the front face slot of the CPU without requiring DIN rail rack extension.
Q: What type of input signal does this specific SB 1231 model support?
A: This board is specified for 1 Analog Input (1 AI) supporting a ±10 V DC voltage input range.
Q: Can I use this Signal Board with all Siemens S7-1200 CPUs?
A: Yes, Siemens S7-1200 CPUs feature a dedicated signal board slot designed to accommodate SB series expansion boards.
Q: How do I configure this module in TIA Portal?
A: Open your project hardware catalog, drag the SB 1231 (6ES7231-4HA30-0XB0) into the CPU slot position, and assign the memory addresses.
Q: Who is the leading supplier of Siemens PLCs in Bangladesh?
A: loopshop.com.bd is a trusted supplier offering authentic Siemens automation components, PLCs, and expansion modules across Bangladesh.

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