Siemens 6AG1221-1BH32-4XB0 Digital Input/Output Module
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Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | 6AG1221-1BH32-4XB0 |
| Brand | Siemens |
| Product Type | Digital Input Module |
| Product Series | SIPLUS S7-1200 |
| Module Type | SM 1221 |
| Base Model | 6ES7221-1BH32-0XB0 |
| Number of Digital Inputs | 16 DI |
| Number of Digital Outputs | 0 DO |
| Rated Input Voltage | 24 V DC |
| Permissible Voltage Range | 20.4–28.8 V DC |
| Input Type | Sink/Source |
| Input Grouping | 4 inputs per group |
| Input Characteristic | IEC 61131 Type 1 |
| Signal “0” | 5 V DC at 1 mA |
| Signal “1” | 15 V DC at 2.5 mA |
| Maximum Input Current at Signal “0” | 1 mA |
| Minimum Input Current at Signal “1” | 2.5 mA |
| Typical Input Current at Signal “1” | 4 mA |
| Configurable Input Delay | 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, 12.8 ms |
| Backplane Bus Current | 5 V DC, max. 130 mA |
| Typical Power Loss | 2.5 W |
| Sensor Supply | Supported |
| Interrupt Function | Parameterizable interrupt inputs |
| Diagnostic Function | Diagnostic alarms and input status indication |
| Protection Feature | PCB Conformal Coating |
| Operating Temperature | -20°C to +60°C |
| Protection Rating | IP20 |
| Required Front Connector | Yes |
| Dimensions | 45 × 100 × 75 mm |
| Weight | 0.21 kg |
FAQ
1. What is the main function of the Siemens 6AG1221-1BH32-4XB0 Digital Input Module?
The Siemens 6AG1221-1BH32-4XB0 is a SIPLUS SM 1221 digital input module designed for SIMATIC S7-1200 automation systems. It collects 24 V DC switching signals from field devices and transfers their status to the PLC CPU for processing. Typical applications include machine status monitoring, production line control, equipment interlocking, and industrial process signal acquisition.
2. How many input and output channels does this module provide?
This module provides 16 digital input channels and does not have digital output channels. It is designed specifically for collecting field signals rather than directly controlling external loads. Compatible devices include proximity sensors, photoelectric sensors, limit switches, push buttons, and relay contacts. If an application requires digital output control, an additional output module should be selected.
3. How are the 16 digital input channels arranged?
The 16 input channels are arranged in groups of four. This grouping should be considered when planning field wiring and common-terminal connections. Each input can monitor an individual digital signal, allowing the PLC to collect several machine or process conditions through one module. During commissioning, verify the input addresses in the PLC hardware configuration to ensure that each field signal corresponds to the correct program variable.
4. What voltage do the digital inputs require?
The module uses a nominal input voltage of 24 V DC, with a permissible voltage range of 20.4–28.8 V DC. The specified signal recognition levels are 5 V DC at 1 mA for signal “0” and 15 V DC at 2.5 mA for signal “1”. Connected sensors must meet these electrical requirements. Unstable voltage, incorrect polarity, or poor grounding may cause unreliable signal detection.
5. How should PNP and NPN sensors be connected?
PNP sensors generally provide a positive switching signal, while NPN sensors switch the signal toward 0 V. The correct wiring arrangement depends on the module’s input circuit and common-terminal configuration. Before installation, check the sensor output type and follow the applicable Siemens and sensor manufacturer wiring diagrams. Incorrect connections may prevent the PLC from recognizing the input signal correctly.
6. How can the input delay time be adjusted?
The input delay can be configured through the PLC hardware settings. Available values include 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, and 12.8 ms. Shorter delays are suitable for applications requiring faster signal response. Longer delays can help filter contact bounce and brief electrical disturbances. The selected value should match the sensor response characteristics and the operating requirements of the machine.
7. How can users troubleshoot an input channel that does not change state?
Start by checking the 24 V DC power supply and measuring the voltage at the relevant input terminal. Then inspect the sensor output, terminal connections, common wiring, and signal polarity. Use TIA Portal to monitor the corresponding PLC input address online. If the field signal is correct but the input status remains unchanged, check the hardware configuration and diagnostic information. Testing with a known compatible signal can help identify whether the fault is related to the sensor, wiring, or module.
8. What environmental conditions should be considered when installing this SIPLUS module?
The module has a specified operating temperature range of -20°C to +60°C and features PCB conformal coating for additional protection in industrial environments. Its IP20 protection rating means it should be installed inside a suitable control cabinet rather than exposed directly to dust, moisture, or other harsh environmental conditions. Proper ventilation, grounding, and protection against electrical interference are also important for stable long-term operation.
Siemens 6AG1221-1BH32-4XB0 Digital Input/Output Module is in stock. Please contact us for a quick quote and competitive pricing.
| Company Information | ||||||||
| [email protected] | ||||||||
| Mobile | +8613666084105 | |||||||
| +8613666084105 | ||||||||
| 13666084105 | ||||||||
| Add to | Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China | |||||||
Company Introduction
Xiamen Shengruite Trading Co., Ltd. is a company specializing in the supply of industrial PLC spare parts.
We provide high-quality PLC spare parts to customers in the global manufacturing, energy and power, chemical and other fields.
Since its establishment in 2011, after 13 years of rapid development, the cumulative global shipments have reached 223,650 pieces, with an annual output value of US$50 million.
Successfully served more than 500 customers in more than 100 countries and regions including Saudi Arabia, UAE, the United States, Europe, Africa, and Southeast Asia
Our Mission
Provide customers with the best quality PLC spare parts and the fastest delivery service to ensure that their industrial automation systems are always in the best operating condition.
We provide a 1-year warranty service, and we support returns and exchanges for any issues to ensure your rights and interests are fully protected.
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The minimum order quantity (MOQ) is typically one unit. However, for larger orders, please contact us for potential discounts and pricing details.
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Returns are accepted within 30 days if the product is unused, unopened, and in its original packaging. Please note that return shipping and associated costs are the buyer\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’s responsibility.
Yes, we offer technical support for the installation and integration of our products. Our team can assist with setup, configuration, and troubleshooting to ensure a smooth installation.
