Input Output Module Bus System PoE Detection
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Solution Overview
Problem
Existing automation networks require separate cabling for data transmission and power supply, leading to increased costs and complexity, especially in industrial settings where high shielding and temperature resistance are necessary, and existing Power over Ethernet (PoE) systems cannot seamlessly integrate devices with different power supply configurations.
Innovation Solution
An input/output module that uses a four-wire data cable to transmit both differential data signals and two DC-isolated voltage supplies, with a measuring device to detect the number of contact pins in a connector and only apply power if five pins are present, allowing for safe integration with devices not configured for PoE, thereby reducing cabling needs and ensuring compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate cabling systems are used for data transmission and power supply, then reliability of independent operation is improved, but device complexity and cabling costs increase
Solution Approach 1:
The patent combines data transmission and power supply functions into a single cabling system using PoE technology. The Ethernet cable that previously carried only data signals now simultaneously carries both data and electrical power, eliminating the need for separate power cables and reducing overall system complexity while maintaining the ability to independently control power supply to actuators.
Solution Approach 2:
The Ethernet cable is transformed into a multi-functional medium that performs both data communication and power delivery functions. This universal cable solution replaces the need for specialized separate cabling systems, reducing installation complexity and cost while maintaining operational independence through selective power supply control.
2Ease of manufacture
If PoE is used to transmit power and data over the same line, then cabling costs are reduced, but compatibility with non-PoE devices becomes problematic
Solution Approach 1:
The system performs preliminary detection of PoE capability before activating power transmission. The detecting device checks whether the connected device supports PoE functionality, and only if compatibility is confirmed does the system enable power supply over the data line. This prevents damage to non-PoE devices while maintaining the cost benefits of unified cabling.
Solution Approach 2:
The system implements a feedback mechanism where the detecting device continuously monitors the connected device's PoE capability status. Based on this feedback information, the control device dynamically adjusts power transmission, enabling it only when the receiver is confirmed to be PoE-compatible, thus ensuring safe operation across different device types.
3Ease of operation
If two supply voltages are transmitted on the same data line, then cabling simplicity is improved, but risk of voltage misapplication increases
Solution Approach 1:
Before transmitting any supply voltage over the data line, the system performs preliminary detection to confirm the receiving device's PoE capability and voltage requirements. This advance verification ensures that voltages are only applied when appropriate, preventing misapplication damage while maintaining the operational simplicity of unified cabling.
Solution Approach 2:
The detecting device acts as an intermediary between the power source and the connected device, verifying compatibility before allowing voltage transmission. This intermediary check layer ensures that the simplified single-cable system maintains safety by preventing voltage misapplication to incompatible devices.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables efficient data transmission and power supply over a single cabling system, ensuring compatibility with devices that do not support Power over Ethernet, while maintaining the functionality of different bus structures and allowing for independent operation of actuators and sensors.
Implementation Method 1
A specially adapted Ethernet transformer is used for this purpose in the PoE standard, which transformer applies the two potentials required for the voltage to each pair of wires via a centre tap
Data Source
AI summary
An input/output module is provided for a bus system having a socket, the five contact cups of which each may comprise an electrical contact, and a measuring device for detecting a connector of a four-wire data cable. The measuring device can be configured to detect, when a connector is inserted into the socket, whether the connector comprises four or five electrical contact pins which are each plugged into one of the contact cups and are electrically connected to the respective electrical contact of the contact cups. The measuring device may be configured to close a first and a second switching device only when five electrical contact pins are detected in order to apply a respective supply voltage from two DC voltage supplies to the corresponding plugged contact pins of the connector plugged into the socket via the respective electrical contacts of the contact cups.