Siemens 6ES5317-3UA11 Interface Module

Technical Specifications and Module Design

This interface module connects expansion racks to the central controller for SIMATIC S5 systems. The Siemens 6ES5317-3UA11 extends the I/O bus across multiple chassis configurations. You can install this unit in both the master and expansion rack positions. Its rugged design ensures reliable communication over longer cable distances. The module weighs approximately 0.52 kilograms. Its dimensions measure 25 cm in height, 5 cm in width, and 21 cm in depth.

Parameter	Specification
Brand	Siemens
Model	6ES5317-3UA11
Category	Interface Module / Expansion Bus Connector
Weight	0.52 kg
Height	25 cm
Width	5 cm (single slot)
Depth	21 cm
Number of Interfaces	2 x 20-pin DIN connectors (cable side) + backplane connector
Cable Type	Siemens 6ES5317-5AB11 (shielded flat ribbon cable)
Maximum Cable Length	10 meters between racks
Number of Expansion Racks	Up to 4 racks per controller
Communication Type	Parallel bus (TTL level)
Bus Frequency	500 kHz
Isolation Voltage	500V DC between cable and backplane
Energy Storage	None (no battery or capacitors)
Component Count	Single PCB with bus drivers and receivers
Operating Temperature	0°C to 60°C

Bus Extension and Signal Driving

The module contains bus drivers to boost signals for longer cable runs. These drivers overcome voltage drops and noise pickup on the extension cable. The Siemens 6ES5317-3UA11 also receives incoming signals from remote racks. It regenerates weak signals before passing them to the backplane bus. The module uses differential signaling for improved noise immunity. Consequently, you can place I/O racks up to 10 meters from the CPU. A green LED indicates proper module operation and power status.

System Integration and Addressing

You must install one interface module in the central rack and one in each expansion rack. The master module drives the bus while the slave modules receive it. The Siemens 6ES5317-3UA11 does not consume any I/O addresses. It operates transparently to the user program and I/O configuration. The module automatically synchronizes with the CPU scan cycle. A missing or faulty interface module will stop all communication to downstream racks. The LED will flash to indicate a cable break or termination error.

Installation and Cabling Guidelines

You must use the specified Siemens flat ribbon cable for reliable operation. Standard unshielded cables will cause communication errors due to noise. The Siemens 6ES5317-3UA11 requires termination resistors at both ends of the cable. These resistors match the cable impedance and prevent signal reflections. You should route the cable away from power wiring and motor drives. The module draws all operating power from the S5 backplane supply. It requires no external power source or configuration software.