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Channel Expansion for S5-135U/155U Systems
The Siemens 6ES5526-3LA22 expansion module increases the I/O capacity of S5-135U and S5-155U programmable controllers. This module adds 8 additional digital input channels and 8 digital output channels to the existing configuration. Growing automation systems require scalable solutions, and this unit provides exactly that capability.
Technical Specifications and Channel Configuration
This expansion module features 8 sinking input channels and 8 sourcing output channels in a single unit. The inputs accept 24 V DC signals with a nominal current of 7 mA per channel. Each output switches up to 0.5 A at 24 V DC with short-circuit protection. Furthermore, the module includes optical isolation of 1500 V AC between the field signals and the backplane.
| Parameter | Specification |
|---|---|
| Brand | Siemens |
| Model | 6ES5526-3LA22 |
| Digital Inputs | 8 (sinking, 24 V DC) |
| Digital Outputs | 8 (sourcing, 24 V DC, 0.5 A) |
| Input Current per Channel | 7 mA (at 24 V) |
| Output Current per Channel | 0.5 A (continuous) |
| Isolation Voltage | 1500 V AC |
| Dimensions (W x H x D) | 50 mm x 125 mm x 118 mm |
| Weight | 0.42 kg |
| Power Consumption | 5 V DC at 200 mA |
| Compatible CPUs | S5-135U, S5-155U |
| Operating Temperature | 0°C to 55°C |
Protection and Diagnostic Features
The Siemens 6ES5526-3LA22 incorporates comprehensive protection mechanisms for reliable operation. Each output channel includes thermal shutdown that activates at 85°C to prevent damage. The module also features reverse polarity protection on both inputs and outputs. Additionally, LED indicators display the status of each input and output channel for quick visual diagnostics.
Physical Design and Installation
This expansion module features a 50 mm housing that fits standard S5-135U and S5-155U rack slots. The unit weighs approximately 0.42 kilograms, allowing straightforward installation and removal. A 32-pin front connector provides access to all input and output terminals. The module uses screw-type terminals that accept wires from 0.5 mm² to 2.5 mm².
System Integration and Addressing
You can install this expansion module in any slot of the S5-135U or S5-155U central or expansion rack. The module automatically maps its 8 inputs and 8 outputs to consecutive addresses in the I/O table. Users can configure input filters and output default states through the STEP 5 programming software. The module supports both local and remote rack configurations.
Application Guidelines and Environmental Ratings
This expansion module operates reliably from 0°C to 55°C with an IP20 protection rating. For output connections, use appropriate wire gauges to handle the rated current. Always connect the common supply terminals correctly for proper input and output operation. The module meets CE standards for industrial control equipment.