Siemens 6ES5185-3UA13 Expansion Unit

Extend Your S5-115U I/O Capacity

This expansion unit adds extra I/O slots to your SIMATIC S5-115U automation system. The Siemens 6ES5185-3UA13 connects to the central controller via a single interface cable. It accommodates up to eight S5-115U modules including digital and analog cards. A built‑in power supply provides stable 24V DC to all installed modules. Consequently, this unit allows system growth without replacing your existing CPU.

Physical Design & Rack Configuration

The Siemens 6ES5185-3UA13 features eight slots for standard S5-115U I/O modules. You install this expansion rack up to 100 meters away from the central unit. The front panel includes a status LED for power and communication monitoring. A manual reset button allows local system recovery after faults. The rack uses passive backplane technology for maximum reliability.

Parameter	Detailed Specification
Dimensions (H x W x D)	13.5 cm x 25.0 cm x 13.0 cm
Weight	1.6 kg (3.53 lbs)
Number of Slots	8 (for S5-115U modules)
Compatible Racks	SIMATIC S5-115U central or expansion
Max Cable Distance	100 meters (to central controller)
Power Supply Output	24V DC, 2A (internal)
Input Voltage	85V to 264V AC (auto‑ranging)
Backplane Type	Passive (no active components)
Status Indication	1 green LED (power/communication OK)
Reset Button	1 manual (front panel)
Energy Storage	None (passive design)
Interface Connector	1 x 15‑pin D‑sub (IM port)

Installation & System Integration

You mount the Siemens 6ES5185-3UA13 onto a standard DIN rail or panel. After securing the rack, you insert your I/O modules into the eight slots. You then connect the interface cable to the central controller’s IM port. Finally, you wire AC power to the built‑in power supply terminals. The rack powers up automatically when you apply voltage.

Operational Advantages & Remote Placement

This expansion unit eliminates the need for a second CPU in larger systems. You can place the rack near field devices to reduce wiring costs significantly. For example, position one unit at a conveyor system and another at a packaging station. The passive backplane design contains no moving parts or batteries. Therefore, this Siemens expansion unit offers decades of maintenance‑free service.