16 Digital Inputs
The SM 321 provides 16 digital input channels for acquiring 24 VDC field signals in SIMATIC S7-300 automation systems.
SIEMENS 6ES7321-1BH02-0AA0 SM 321 Digital Input Module 16DI 24VDC
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Technical Specifications
| Brand | SIEMENS |
| Model Number | 6ES7321-1BH02-0AA0 |
| Product Category | Digital Input Module |
| Product Type | SM 321 |
| System | SIMATIC S7-300 |
| Number of Digital Inputs | 16 |
| Rated Input Voltage | 24 VDC |
| Input Voltage for Signal 1 | 13-30 VDC |
| Input Voltage for Signal 0 | -30 to +5 VDC |
| Input Current for Signal 1 | 7 mA typ. |
| Input Characteristic | According to IEC 61131, Type 1 |
| Input Delay | 1.2-4.8 ms |
| Number of Input Groups | 1 |
| Power Loss | 3.5 W typ. |
| Front Connector | 20-Pole |
Key Features
24 VDC Input Signals
The module is designed for a rated input voltage of 24 VDC and uses input characteristics according to IEC 61131 Type 1.
S7-300 Signal Module
6ES7321-1BH02-0AA0 belongs to the SIMATIC S7-300 SM 321 digital input module family.
Potential Isolation
The digital inputs are electrically isolated from the S7-300 backplane bus for field signal acquisition.
20-Pole Front Connection
The module uses a 20-pole front connector arrangement for connecting field wiring to its digital input channels.
Defined Input Delay
Published technical data specifies an input delay range of 1.2 to 4.8 ms for standard digital signal processing.
Applications
- SIMATIC S7-300 PLC systems
- Industrial machine control
- Sensor signal acquisition
- Limit switch monitoring
- Pushbutton and selector input acquisition
- Production line automation
- Equipment status monitoring
- Factory automation control panels
Purchase Information
We support online purchase of the SIEMENS 6ES7321-1BH02-0AA0 Digital Input Module. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.
Frequently Asked Questions
What is SIEMENS 6ES7321-1BH02-0AA0?
It is a SIMATIC S7-300 SM 321 digital input module for acquiring 24 VDC digital field signals.
How many digital inputs does 6ES7321-1BH02-0AA0 provide?
The module provides 16 digital input channels.
What is the rated input voltage?
The rated input voltage is 24 VDC.
What is the typical input current for signal 1?
The documented typical input current for signal 1 is 7 mA.
Which PLC family uses this module?
6ES7321-1BH02-0AA0 belongs to the SIMATIC S7-300 signal module family.
What input characteristic does the module use?
Its digital input characteristic is specified according to IEC 61131 Type 1.
What is the input delay?
Published technical data specifies an input delay range of 1.2 to 4.8 ms.
Are the inputs isolated from the backplane bus?
Yes. Potential isolation is provided between the digital input channels and the backplane bus.
What front connector is used?
The module uses a 20-pole front connector arrangement.
Where can 6ES7321-1BH02-0AA0 be used?
It can be used for acquiring digital signals from sensors, switches and other 24 VDC field devices in suitable S7-300 automation systems.
Can 6ES7321-1BH02-0AA0 be considered for an existing S7-300 system?
It can be considered after the exact article number, CPU and rack configuration, input voltage, channel requirements, front connector and engineering configuration have been checked.
What should be checked before ordering?
Check the complete 6ES7321-1BH02-0AA0 article number together with the S7-300 hardware configuration, required number of inputs, 24 VDC signal requirements and front connector arrangement before ordering.
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