Siemens 6ES5700-8EA11 Bus Module

Technical Specifications and Bus Architecture

This bus module provides backplane communication for Siemens SIMATIC S5-115U systems. The Siemens 6ES5700-8EA11 connects multiple I/O modules to the central processor. You can install this passive component into any standard S5-115U rack position. Its simple design requires no configuration or addressing before use. The module weighs approximately 0.28 kilograms. Its dimensions measure 25 cm in height, 5 cm in width, and 21 cm in depth.

Parameter	Specification
Brand	Siemens
Model	6ES5700-8EA11
Category	Bus Module / Backplane Interconnect Unit
Weight	0.28 kg
Height	25 cm
Width	5 cm (single slot)
Depth	21 cm
Bus Type	Parallel backplane bus (S5-115U specific)
Number of Bus Connectors	2 x 48-pin DIN 41612 (male)
Number of I/O Slots Supported	Up to 8 modules per expansion unit
Signal Lines	32 data lines, 16 address lines, 8 control lines
Maximum Bus Frequency	1 MHz
Isolation Voltage	None (passive through connection)
Energy Storage	None (no passive or active components)
Component Count	PCB with 2 connectors and copper traces only
Operating Temperature	0°C to 60°C

Bus Signal Distribution and Design

The module acts as a passive signal distributor for the backplane bus. It carries data, address, and control signals between adjacent modules. The Siemens 6ES5700-8EA11 uses no active electronic components whatsoever. Therefore, it requires no power supply or configuration for operation. Two 48-pin DIN connectors sit on the rear side of the PCB. These connectors plug into the backplane of the S5-115U expansion rack. The board simply passes all signals through from left to right.

System Integration and Placement

You must install this module between the interface module and I/O cards. The bus module creates physical spacing for better heat dissipation. You can place empty bus modules in unused rack slots as fillers. The Siemens 6ES5700-8EA11 does not affect scan time or performance. It only extends the electrical bus to adjacent slots. The module supports up to eight I/O modules in one expansion unit. A missing bus module will break the communication chain completely.

Installation and Operational Guidelines

You must insert this module into a standard S5-115U rack slot. The module requires no external power or signal connections. You should use filler modules for empty slots to maintain airflow. The bus module supports hot-swapping of I/O cards during operation. However, you cannot remove the bus module itself while powered. The gold-plated connector pins resist oxidation for reliable long-term contact. You should inspect these pins for damage before each installation.