Siemens 6ES7288-1CR40-0AA0 Relay Output Expansion Module for PLC

The Siemens 6ES7288-1CR40-0AA0 is a vital component for expanding the control capabilities of Siemens SIMATIC S7-1200 programmable logic controllers (PLCs). This relay output expansion module offers robust performance and straightforward integration, providing additional switching capacity for diverse industrial automation tasks. Its key advantages include enhanced control flexibility, reliable relay switching, and seamless compatibility within the S7-1200 ecosystem. Crucial technical parameters include 16 relay outputs, a 2A switching current per channel, and a 24V DC operating voltage, making it suitable for a wide range of applications requiring direct control of actuators, contactors, and indicator lamps.

Siemens 6ES7288-1CR40-0AA0: Product Specifications

| Feature                 | Specification                                     |

| :---------------------- | :------------------------------------------------ |

| Product Type            | Relay Output Expansion Module                     |

| Compatible PLC Series   | SIMATIC S7-1200                                   |

| Number of Outputs       | 16                                                |

| Output Type             | Relay (Changeover contacts)                       |

| Max. Switching Current  | 2 A per channel                                   |

| Max. Switching Voltage  | 30 V DC / 250 V AC                                |

| Operating Voltage       | 24 V DC (from backplane)                          |

| Module Width            | 45 mm                                             |

| Front Connector Type    | 40-pin                                            |

| Ambient Temperature     | -20 °C to +60 °C                                  |

| Protection Rating       | IP20                                              |

| Dimensions (H x W x D)  | 107 mm x 45 mm x 75 mm                            |

| Order Number            | 6ES7288-1CR40-0AA0                                |

Core Features & Market Positioning

The Siemens 6ES7288-1CR40-0AA0 distinguishes itself through its robust relay switching capabilities, offering a significant advantage in applications requiring high current loads or isolation between control and power circuits. Unlike solid-state outputs, these relays provide true electrical isolation and can handle inductive loads more effectively. This makes the module a preferred choice for controlling motors, solenoids, and lighting systems where reliable switching and surge protection are paramount. Its seamless integration with the S7-1200 platform positions it as a cost-effective and efficient solution for expanding automation systems without requiring a complete hardware overhaul, catering to small to medium-sized automation projects that demand reliability and performance.

Key Application Scenarios

This relay output expansion module is ideally suited for a variety of industrial tasks. It excels in machine control, enabling the direct switching of motor contactors, pneumatic valves, and hydraulic actuators. In building automation, it can manage lighting circuits, HVAC systems, and security alarms, offering versatile control over diverse loads. Furthermore, its capacity to handle both AC and DC switching makes it applicable in process control for managing pumps, mixers, and other equipment requiring robust switching operations. The 16-channel density also makes it efficient for applications requiring multiple independent outputs from a single PLC.

Practical System Integration Guidance

Integrating the Siemens 6ES7288-1CR40-0AA0 into an S7-1200 system is a streamlined process. The module mounts directly onto the DIN rail adjacent to the S7-1200 CPU or another expansion module, connecting via the integrated backplane bus. Wiring involves connecting the field devices to the 40-pin front connector, observing proper polarity for DC loads and phase considerations for AC. For programming, the module is recognized by the TIA Portal software, where its outputs can be addressed as digital outputs within the PLC's I/O table. Creating the logic involves using standard relay contacts (NO/NC) in the programming environment to control the physical outputs based on PLC conditions.

Operation and Risk Mitigation

Proper operation of the Siemens 6ES7288-1CR40-0AA0 ensures reliable automation. Users must adhere to the specified maximum switching current and voltage ratings to prevent premature wear or failure of the relay contacts. Incorrect wiring, such as exceeding these limits or misconnecting AC and DC loads, represents a significant risk. Surge protection should be considered for inductive loads to prolong contact life. In case of faults, the S7-1200 system's diagnostics can help identify issues, though relay failures are typically indicated by a lack of output switching or audible clicking. Regular visual inspection for signs of overheating or contact degradation is recommended during scheduled maintenance.

Scalability & Long-Term Value

The Siemens 6ES7288-1CR40-0AA0 offers significant scalability and long-term value within the SIMATIC S7-1200 ecosystem. Its modular design allows for easy expansion; additional output modules can be added to the CPU as control requirements grow, providing a flexible upgrade path without replacing the entire controller. Compatibility with the TIA Portal engineering framework ensures that projects can be easily modified and expanded over time. As Siemens continues to develop its Industrial IoT (IIoT) and Industry 4.0 solutions, the S7-1200 platform, including its expansion modules, remains well-supported, enabling seamless integration with higher-level systems for data acquisition and remote monitoring, thus safeguarding investment.

Frequently Asked Questions (FAQs)

What is the maximum current this module can switch?

The Siemens 6ES7288-1CR40-0AA0 relay output module supports a maximum switching current of 2 Amperes per channel. This rating applies to both AC and DC loads, provided the voltage limits are also observed. Exceeding this current can lead to overheating and premature failure of the relay contacts.

Can this module switch AC and DC loads?

Yes, this module is designed to switch both AC and DC loads within its specified voltage and current limits. The relay contacts are changeover (SPDT), offering flexibility for normally open (NO) or normally closed (NC) configurations. Always ensure correct wiring for the type of power supply being switched.

How do I wire the outputs for inductive loads like motors?

For inductive loads, it is highly recommended to incorporate a freewheeling diode or a surge suppressor across the load terminals. This protects the relay contacts from voltage spikes generated when the inductive load is switched off. Proper wiring involves connecting the load and the protective component to the relay output terminals.

What is the voltage range for AC and DC switching?

The module can switch a maximum of 30 Volts DC and 250 Volts AC. Adhering to these limits is crucial for safe and reliable operation. Using the module outside these voltage specifications can result in damage to the module or connected equipment.

How many total output channels does this module provide?

This module provides a total of 16 digital relay output channels. These channels are independent of each other, allowing for the control of up to 16 separate devices or circuits. The density of outputs makes it efficient for various applications.

What is the operating voltage required for the module itself?

The Siemens 6ES7288-1CR40-0AA0 derives its operating power from the S7-1200 CPU's backplane. Therefore, it does not require a separate external power supply. The CPU must be powered by its specified 24V DC supply.

How do I configure this module in TIA Portal?

In TIA Portal, you add the 6ES7288-1CR40-0AA0 module to your hardware configuration under the S7-1200 CPU. The software automatically recognizes the module and its 16 output addresses, which you can then use in your PLC program logic.

What are the physical dimensions of the module?

The module has a width of 45 mm, a height of 107 mm, and a depth of 75 mm. These compact dimensions allow for space-efficient mounting on a standard DIN rail alongside the PLC CPU and other expansion modules.

Is this module compatible with older Siemens PLC series?

No, the 6ES7288-1CR40-0AA0 is specifically designed for the SIMATIC S7-1200 series. It is not compatible with older PLC generations like the S7-200 or S7-300/400 families. Use appropriate modules for those platforms.

What is the typical troubleshooting process for this module?

Troubleshooting usually involves checking the PLC program logic for correct output addressing and conditions. Verify wiring integrity and ensure the module receives power from the backplane. If an output fails to switch, inspect the connected load and the relay contacts for any visible damage or wear.