Siemens 6EP5400-1BB00 Interface Module

Technical Specifications and Module Design

This interface module provides signal connection between Siemens PLCs and field devices. The Siemens 6EP5400-1BB00 acts as a bridge between controller backplanes and remote I/O. You can install this module into any standard S7-300 or ET200M rack slot. Its compact design enables easy integration into existing control cabinets. The module weighs approximately 0.28 kilograms. Its dimensions measure 12.5 cm in height, 5.5 cm in width, and 11 cm in depth.

Parameter	Specification
Brand	Siemens
Model	6EP5400-1BB00
Category	Interface Module / Bus Coupler Unit
Weight	0.28 kg
Height	12.5 cm
Width	5.5 cm (single slot)
Depth	11 cm
Communication Interface	RS-485 (PROFIBUS DP compatible)
Communication Speed	9.6 Kbps to 12 Mbps (auto-detecting)
Maximum Cable Length	100 meters (electrical isolation)
Number of Supported Slaves	Up to 32 devices per segment
Backplane Interface	32-bit parallel bus
Isolation Voltage	1500V DC between PROFIBUS and logic
Power Supply	24V DC (from backplane)
Power Consumption	2.5 Watts maximum
Status Indicators	2 LEDs (power and bus status)
Energy Storage	None (no battery)
Component Count	Single PCB with bus driver, isolation circuit, and interface logic

PROFIBUS Communication and Integration

The module connects the S7-300 backplane to a PROFIBUS DP network. It acts as a slave device on the PROFIBUS network. The Siemens 6EP5400-1BB00 automatically detects the bus baud rate after power-up. It supports baud rates from 9.6 Kbps up to 12 Mbps. A front-panel LED indicates successful bus synchronization with the master. The module transmits I/O data cyclically to the PROFIBUS master. It also passes configuration parameters from the master to local I/O modules.

Data Exchange and I/O Mapping

The module maps local I/O data directly into the PROFIBUS address space. You can configure up to 64 bytes of input and 64 bytes of output data. The Siemens 6EP5400-1BB00 handles both bit-oriented and byte-oriented data transfers. It supports consistent data transfer for safety-related applications. The module provides diagnostic data to the PROFIBUS master. A yellow LED flashes when the module detects a configuration error. The module stores no user data independently from the master.

Installation and Operational Guidelines

You must insert this module into the first slot of the ET200M rack. The backplane supplies 5V and 24V DC power to the module automatically. The Siemens 6EP5400-1BB00 draws approximately 100 mA from the 24V supply rail. You must use standard PROFIBUS DP cables with proper termination. This cable requires termination resistors at both ends of the segment. The module requires no external battery for normal network operation. You should verify the bus address setting using the two rotary switches. Incorrect addressing will prevent communication with the PROFIBUS master.