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Siemens 6ES7321-1BH02-0AA0 digital input SM 321 Original new

Siemens 6ES7321-1BH02-0AA0 digital input SM 321 Original new

Product Name:digital input SM 321

Brand Name:Siemens

Model Number:6ES7321-1BH02-0AA0

Country of Origin:Germany

Warranty: 12 Months

Whatsapp：+86 18159889985

Email：[email protected]

Appurtenance:

siemens 6es7321 1bh02 0aa0 digital input sm 321 original new-1

Overview
Contact for quotation
Specifications
Description
Applications
Features
Functions
FAQ
Spares
Recommended Products

Overview

Brand Name:	Siemens
Model Number:	6ES7321-1BH02-0AA0
Country of Origin:	Germany
Packaging Details:	Original new Factory Sealed
Delivery Time:	in stock
Payment Terms:	T/T

Contact for quotation

Sales Manager:	Stella
Send an email:	[email protected]
Contact in Whatsapp:	+86 18159889985

Specifications

Item	Specification
Product Model	6ES7321-1BH02-0AA0
Series	SIMATIC S7-300
Module Type	Digital Input Module (SM 321)
Input Channels	16 DI
Input Voltage	24 V DC (20.4–28.8 V DC)
Input Signal “1”	13–30 V DC
Input Signal “0”	-30 to +5 V DC
Input Current	~7 mA (typical per channel)
Isolation	Optocoupler isolation
Backplane Voltage	5 V DC
Power Loss	3.5 W (typical)
Cable Length	1000 m shielded / 600 m unshielded
Dimensions	125 × 40 × 120 mm
Weight	0.20 kg
Mounting	DIN rail (S7-300 rack)

Description

The 6ES7321-1BH02-0AA0 digital input module from the SIMATIC S7-300 series is engineered for reliable acquisition of 24 V DC field signals in industrial automation systems. It provides 16 isolated digital inputs, ensuring stable signal processing and secure separation between field devices and the PLC backplane.

Designed for demanding control environments, the 6ES7321-1BH02-0AA0 supports IEC 61131 Type 1 input characteristics, enabling precise and consistent signal detection with optimized response times. Its optocoupler-based isolation enhances system safety and minimizes electrical interference across channels.

As part of Siemens’ S7-300 I/O portfolio, the 6ES7321-1BH02-0AA0 is widely used in distributed control systems, machine automation, and process monitoring applications. It ensures robust performance, long service life, and seamless integration into existing SIMATIC PLC architectures.

Applications

Power plants: Used for generator set status monitoring and relay protection.
Substations: Enable bus differential control, line protection, and switchyard signal acquisition.
Chemical plants: Integrate process automation and intrinsically safe signal monitoring.
Steel mills (metallurgical plants): Perform control logic in high-temperature and EMI-heavy environments.
Machinery manufacturing plants: Used in automated production lines, robotics, and packaging control systems.

Features

16-channel isolated 24 V DC digital input design
Optocoupler isolation ensures stable signal separation
IEC 61131 Type 1 compliant input behavior
Long-distance wiring support up to 1000 m
Compact S7-300 modular design for easy integration

Functions

Field signal acquisition and processing
Electrical isolation between field devices and PLC system
Real-time input status detection
Support for industrial automation logic control
Stable operation under industrial electrical noise environments

FAQ

Q1: What is the main function of 6ES7321-1BH02-0AA0?
A1: It is used to collect and process 24 V DC digital input signals in SIMATIC S7-300 PLC systems.

Q2: How many input channels does this module support?
A2: It supports 16 isolated digital input channels.

Q3: Is the module suitable for long-distance wiring?
A3: Yes, it supports up to 1000 m shielded cable connections.

Q4: Does 6ES7321-1BH02-0AA0 provide electrical isolation?
A4: Yes, it uses optocoupler isolation between inputs and the backplane bus.

Q5: What industries commonly use this module?
A5: It is widely used in power plants, substations, chemical plants, and industrial automation systems.

Spares

6EP1931-2EC31	6EP1336-3BA00-8AA0
6ES7214-1BD23-0XB8	6ES7132-4BD00-0AA0
6ES7131-4BD00-0AA0	6ES7235-0KD22-0XA0
6GK5408-8GR00-2AM2	6ES7134-4JB01-0AB0
6SL5510-1BE10-4AF0	6GK7243-5DX30-0XE0
6AV6648-0DE11-3AX0	6ES7323-1BH01-0AA0
6ES7355-1VH10-0AE0	6AV7230-0DA20-0BA0
6ES7141-1BF12-0XB0	6DD1607-0AA1
6ES7151-1CA00-1BL0	6ES7151-1CA00-3BL0
6AV2128-3QB06-0AX0	6ES7132-4BD32-0AA0
3RK1301-0KB00-1AA2	3RK7137-6SA00-0BC1-ZI31
6GT2811-6BC10-2AA0	6EP3437-8SB00-0AY0
6GT2801-1BA10	6ES7517-3HP00-0AB0
6EP3334-7SB00-3AX0	6AV6642-0BC01-1AX1
3RX9501-1BA00	6ES7155-6BA00-0CN0
6DL1155-6AU00-0PM0	6ES7226-6BA32-0XB0