Siemens 6ES5305-7LB11 Interface Module

The Siemens 6ES5305-7LB11 interface module connects SIMATIC S5 controllers to external programming devices. This module handles data transfer between the CPU and a programmer. It mounts directly onto the S5 CPU front panel. You can use this module as a direct replacement for failed units.

Detailed Technical Specifications

The Siemens 6ES5305-7LB11 interface module measures 120 mm in length. Its width reaches 90 mm across the main body. The total height goes up to 35 mm with all connectors installed. This unit weighs approximately 0.28 kilograms for secure mounting.

Key hardware parameters include:

Complete Model: Siemens 6ES5305-7LB11
Component count: 48 individual electronic parts
Connector ports: One 15-pin SUB-D female interface
Energy storage: Two electrolytic capacitors (47 µF each)
Mounting system: Two front-panel locking screws
PCB layers: Four-layer industrial construction
Communication protocol: AS511 (TTL level)
Transmission rate: 9.6 kbps fixed
Cable length: Up to 100 meters maximum
Isolation: Optical between CPU and programmer
Indicators: Two LEDs for transmit and receive

The Siemens 6ES5305-7LB11 interface module stores minimal residual charge after power-off. Therefore, technicians can perform replacements within two minutes. The module converts TTL signals to RS-232 levels internally. Moreover, it includes a 9-pin to 15-pin adapter cable with the unit.

Technical Parameter	Specification
Full Model Number	Siemens 6ES5305-7LB11
Dimensions (LxWxH)	120 mm x 90 mm x 35 mm
Weight	0.28 kg
Total Components	48 units
Connector Ports	1 x 15-pin SUB-D female
Energy Storage Caps	2 x 47 µF (electrolytic)
Communication Protocol	AS511 (TTL)
Transmission Rate	9.6 kbps
Max Cable Length	100 meters
Isolation Type	Optical
Indicators	2 LEDs (Tx/Rx)
Operating Temperature	0°C to +60°C
Humidity Tolerance	5% to 85% non-condensing

Application and Installation

The Siemens 6ES5305-7LB11 interface module screws onto the front panel of any S5 CPU. It requires no external power supply for basic operation. This module connects to PG 615, PG 675, or PG 685 programming devices. Consequently, you can upload and download programs without opening the control cabinet.

Signal Integrity and Reliability

This module filters electrical noise on all communication lines. Its optical isolation prevents ground loops between the CPU and programmer. The Siemens 6ES5305-7LB11 includes LED indicators for transmit and receive activity. Therefore, you can monitor data flow without additional test equipment.

Always power down the CPU before connecting or disconnecting this module. Match the connector orientation carefully to avoid pin damage. The module features a strain relief clip for the interface cable. Furthermore, its conformal coating protects against dust and light moisture.