The Siemens 6ES5 490-7LB21 is a 46-pin front connector engineered for the Simatic S5-115U modular automation system. This interface component serves as the primary physical connection point between field-level instrumentation wiring and the PLC I/O modules. By providing a standardized, secure termination point, it facilitates rapid installation, efficient maintenance, and reliable signal transmission in industrial control environments, including power plant instrumentation and automated manufacturing.
Features
46-pin high-density configuration for S5-115U I/O modules.
Robust screw-terminal design ensures high vibration resistance and secure electrical contact.
Enables module replacement without disconnecting individual field wires, reducing maintenance downtime.
Rugged, non-conductive housing designed for industrial cabinet environments.
Supports organized cable management and reliable signal integrity.
Applications
This connector is specifically designed for use with the Siemens Simatic S5-115U PLC series. It is widely employed in process control systems, automated production lines, and industrial machinery where stable, long-term electrical connectivity is required for I/O signal processing.
Technical Specifications
Model
6ES5 490-7LB21
Brand
Siemens Simatic S5
Pin Count
46-pin
Termination Type
Screw terminal
Operating Temperature
0 to 60 degC
Power Consumption
Passive (none)
Compatibility
Siemens Simatic S5-115U series
Installation Guidelines
Ensure the PLC system is powered down before attempting to attach or remove the front connector from the I/O module.
Align the connector pins carefully with the module interface to prevent bending or damage to the pins.
Verify that all field wires are securely tightened in the screw terminals to prevent intermittent signals due to mechanical vibration.
Ensure the connector is fully seated and locked into the module housing to maintain proper electrical contact.
Maintain proper cable routing to avoid strain on the connector housing and to ensure adequate airflow within the control cabinet.
FAQ
Is this connector compatible with other S5 series modules?
The 6ES5 490-7LB21 is specifically designed for the Simatic S5-115U series. Please verify your specific I/O module part number to ensure mechanical and electrical compatibility.
Does this component require external power?
No, this is a passive interface component used for routing signals between field wiring and the PLC module; it does not consume electrical power.
