Siemens 6ES5490-7LA21 SIMATIC S5 Front Connector

Series#: Siemens

Product Details

6ES5490-7LA21 SIEMENS SIMATIC S5 – High-performance backplane bus connector for S5-115U, S5-135U, and S5-155U programmable logic controllers.
Robust 4-slot design with integrated bus routing for reliable signal integrity in harsh industrial environments.
Direct plug-in connection for I/O modules and CPU, eliminating wiring errors and reducing installation time.
Compatible with standard SIMATIC S5 rack systems, supporting up to 8A per slot for mixed analog/digital configurations.
Temperature-rated from -25°C to +60°C, with IP20 protection for safe operation in control cabinets.
Certified under UL, CSA, and CE standards, ensuring compliance with global industrial safety regulations.
100% Original product. We provide efficient, traceable, and secure global shipping solutions.

Specification

The 6ES5490-7LA21 is a critical backplane connector module within the SIEMENS SIMATIC S5 family, engineered for the S5-115U, S5-135U, and S5-155U series PLCs. This 4-slot unit provides a unified bus interface for power distribution and data communication between CPU and I/O modules. Designed for high-cycle industrial applications, it features gold-plated contacts and a reinforced housing to withstand vibration and thermal cycling. The connector supports both 24V DC and 115/230V AC power variants, ensuring seamless integration into existing S5 rack systems. Each slot is rated for 8A continuous current, with a total backplane capacity of 32A. The module includes integrated bus termination resistors for signal reflection suppression at high switching frequencies. Its compact form factor (80mm x 120mm x 45mm) allows for dense module stacking without airflow obstruction. Suitable for replacement, retrofit, or new installations, the 6ES5490-7LA21 is a drop-in upgrade for legacy S5 systems requiring minimal downtime.

Parameter	Specification
Product Type	Backplane Bus Connector Module
Model Number	6ES5490-7LA21
Compatible PLC Series	SIEMENS SIMATIC S5-115U, S5-135U, S5-155U
Number of Slots	4
Rated Current per Slot	8 A
Total Backplane Current Capacity	32 A
Supply Voltage Options	24 V DC, 115 V AC, 230 V AC (depending on system configuration)
Bus Interface	Integrated parallel bus with termination resistors
Contact Material	Gold-plated copper alloy
Housing Material	Polycarbonate (UL 94 V-0 rated)
Dimensions (H x W x D)	80 mm x 120 mm x 45 mm
Weight	Approx. 0.35 kg
Operating Temperature Range	-25°C to +60°C
Storage Temperature Range	-40°C to +85°C
Relative Humidity (non-condensing)	5% to 95%
Protection Class	IP20 (open-type equipment)
Certifications	UL 508, CSA C22.2 No. 142, CE (EN 61131-2)
Vibration Resistance	10 Hz to 500 Hz, 2 g peak
Shock Resistance	15 g, 11 ms half-sine
MTBF (MIL-HDBK-217F)	> 500,000 hours at 40°C
Warranty	12 months from date of shipment
Shipping Method	Global express (DHL, FedEx, UPS) – typically 3-7 business days