Siemens 6ES5261-5AA21 SIMATIC S5 Digital I/O Module 24V DC PLC Expansion Unit

Siemens 6ES5261-5AA21 module

SIMATIC S5 Digital Input

16DI 24VDC PLC Module

6ES5261-5AA21

Siemens 6ES5261-5AA21 module is a SIMATIC S5 Digital Input PLC component featuring 16DI 24VDC, designed for industrial automation with robust signal acquisition and high reliability in harsh environments.

Specification

SEODescription

The Siemens 6ES5261-5AA21 module is a SIMATIC S5 Digital Input PLC module designed for industrial automation, featuring 16DI 24VDC inputs to interface sensors and switches. It operates within a 24V DC voltage range (20.4–28.8V) and integrates directly with SIMATIC S5 systems, supporting seamless connectivity via the S5 backplane without additional interfaces. With a rugged design, it functions reliably in temperatures from 0°C to 60°C, making it suitable for manufacturing, process control, and machinery applications. Key strengths include high noise immunity, rapid signal processing, and compatibility with legacy S5 architectures. However, its lack of modern communication protocols (e.g., PROFINET) and limited expandability in newer systems are notable drawbacks. Ideal for retrofits or environments prioritizing durability over advanced connectivity.

SEOSpecification

Parameter	Specification
Module Type	Siemens 6ES5261-5AA21 module
System Compatibility	SIMATIC S5 PLC Series
Function	Digital Input (16DI)
Input Voltage	24VDC Nominal
Number of Channels	16 Isolated Inputs
Power Consumption	≤5W
Response Time	Typ. 3ms
Electrical Isolation	500V AC (Channel to Backplane)
Backplane Current	70mA @ 5VDC
Operating Temperature	0°C to 60°C
Protection Class	IP20
Dimensions (WxHxD)	40x125x117 mm
Certification	CE, UL, cULus

SEOQandA

question:What is the warranty period?
answer:Our products come with a 1-year warranty covering material and workmanship defects from the delivery date.
question:What payment methods do you accept?
answer:We accept TT, PayPal, credit cards, and other major payment methods for secure transactions.
question:Why is there a processing fee?
answer:Processing fees cover transaction costs from payment gateways or banks to ensure secure, efficient processing.

SEOQandA_Product

question:Why is the 6ES5261-5AA21 module not recognized by the PLC?
answer:Check power supply connections and ensure correct configuration in the PLC hardware settings.
question:Input signals not detected on 6ES5261-5AA21. What to check?
answer:Verify input device functionality, wiring integrity, and ensure input voltage matches specifications.
question:LED indicators on 6ES5261-5AA21 are off. Possible causes?
answer:Confirm power supply is active (24V DC) and module is properly seated in the rack.
question:How to resolve configuration errors with 6ES5261-5AA21?
answer:Validate DIP switch settings and cross-check parameter assignments in the PLC programming software.
question:6ES5261-5AA21 communication failure with PLC. How to troubleshoot?
answer:Inspect bus connectors, verify module addressing, and check for firmware compatibility issues.