Siemens 6ES5187-5UA11 Expansion Unit

The Siemens 6ES5187-5UA11 expansion unit adds I/O capacity to SIMATIC S5-115U systems. This unit houses additional input and output modules beyond the main rack’s capacity. It connects to the central controller via a dedicated interface cable. You can use this unit as a direct replacement for damaged expansion chassis.

Detailed Technical Specifications

The Siemens 6ES5187-5UA11 expansion unit measures 482 mm in width. Its height reaches 260 mm for standard cabinet mounting. The total depth goes up to 220 mm including rear connectors. This unit weighs approximately 4.1 kilograms for secure installation.

Key hardware parameters include:

Complete Model: Siemens 6ES5187-5UA11
Module slots: 10 slots for S5-115U I/O modules
Slot spacing: 25.4 mm (1 inch) per slot
Connection cable: 1.5 meters (included) with 48-pin connectors
Max distance: 15 meters from main rack
Backplane type: Passive multi-layer PCB
Mounting: Rack-mount (19-inch standard)
Weight capacity: 12 kg maximum for installed modules
Cooling: Natural convection with ventilation slots
Material: Powder-coated steel chassis
Earth connection: M4 grounding stud on rear panel
Indicators: One green LED for power status

The Siemens 6ES5187-5UA11 expansion unit stores no electrical charge whatsoever. Therefore, technicians can handle the unit without any safety precautions. The backplane supports all S5-115U analog, digital, and communication modules. Moreover, the unit includes a termination resistor for the expansion bus.

Technical Parameter	Specification
Full Model Number	Siemens 6ES5187-5UA11
Width	482 mm (19-inch)
Height	260 mm
Depth	220 mm
Module Slots	10 slots
Slot Spacing	25.4 mm
Connection Cable Length	1.5 meters (included)
Max Cable Distance	15 meters
Backplane Type	Passive multi-layer PCB
Mounting Style	Rack-mount
Max Module Weight	12 kg total
Cooling Method	Natural convection
Chassis Material	Powder-coated steel
Indicators	1 green LED
Weight (empty)	4.1 kg

Application and Installation

The Siemens 6ES5187-5UA11 expansion unit mounts into a standard 19-inch industrial cabinet. It requires four M6 screws for secure front-panel mounting. This unit accepts any combination of S5-115U modules in its 10 slots. Consequently, you can expand your I/O count significantly without replacing your existing main rack.

Expansion Bus and Configuration

This unit connects to the main rack using the included 1.5-meter cable. The Siemens 6ES5187-5UA11 requires an interface module in the main rack for communication. You can connect up to two expansion units to one S5-115U system. Therefore, system expansion remains flexible for growing automation needs.

Always mount the unit in a vertical orientation for proper cooling. Connect the ground stud to the cabinet earth bus securely. The unit features a removable rear plate for cable access. Furthermore, its steel construction provides excellent electromagnetic shielding.