6ES5256-3AB21 Siemens SIMATIC S5 Digital Output Module, 24VDC PLC I/O Card, Industrial Control Component

Siemens 6ES5256-3AB21

SIMATIC S5 24VDC

16-Point Digital Input

6ES5256-3AB21

The Siemens 6ES5256-3AB21 is a SIMATIC S5 24VDC 16-point digital input module for industrial automation, providing reliable signal acquisition and compatibility with S5 control systems in process control or machinery applications.

Specification

SEODescription

The Siemens 6ES5256-3AB21 is a **SIMATIC S5 24VDC** digital input module designed for industrial automation systems. It features **16-point digital input** channels, enabling direct connection to sensors or switches operating at 24VDC. This module integrates seamlessly with SIMATIC S5 PLCs, supporting high-speed signal processing and reliable data acquisition. It operates within a voltage range of 20–30VDC and functions optimally in temperatures from 0°C to 60°C, suitable for harsh industrial environments like manufacturing or process control. While it lacks built-in communication interfaces (relying on the S5 backplane bus), its rugged design ensures durability. Key advantages include compatibility with legacy S5 systems and robust performance, though its limited expandability and aging technology may pose challenges in modern networked setups.

SEOSpecification

Parameter	Specification
Product Model	Siemens 6ES5256-3AB21
Product Line	SIMATIC S5
Input Type	24VDC Digital Input
Number of Inputs	16-Point
Input Voltage Range	24VDC Nominal (19.2-30VDC)
Input Current per Point	≈7mA (Typical at 24VDC)
Total Current Consumption	≤120mA (All Inputs Active)
Response Time	≤3ms (On/Off Delay)
Isolation	Optically Isolated Group Inputs
Connection Type	Screw Terminal
Operating Temperature	0°C to +60°C
Storage Temperature	-40°C to +70°C
Protection Class	IP20
Certification	CE, UL, cULus Listed
Dimensions (WxHxD)	80mm x 125mm x 70mm
Weight	≈450g

SEOQandA

question:Do you accept payment after delivery?
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SEOQandA_Product

question:Why is the 6ES5256-3AB21 module not communicating with the PLC?
answer:Check power supply stability, verify bus connection integrity, and confirm PLC configuration matches module addressing.
question:How to resolve unstable analog input readings on 6ES5256-3AB21?
answer:Ensure shielded cables are grounded at one end, eliminate EMI sources, and validate sensor output matches module's input range.
question:What causes 6ES5256-3AB21 status LEDs to remain off or blink abnormally?
answer:Inspect power connections, confirm proper backplane seating, and replace module if hardware faults persist.
question:Why does 6ES5256-3AB21 show configuration errors after setup?
answer:Cross-verify parameterization in STEP 5 software against module specs and re-download corrected configuration.
question:How to prevent 6ES5256-3AB21 overheating in industrial environments?
answer:Maintain ambient temperature below 60°C, ensure adequate airflow, and avoid direct exposure to heat sources.