Why Safety-Certified I/O Matters
A safety certified I/O module can be an important component when control systems are being designed for mobile machinery. Safety-related control functions need to be considered alongside communication, inputs, outputs and environmental conditions. HYDAC Australia provides safety-certified I/O modules developed for mobile applications and harsh operating environments.
Matching the Module to the Machine
A safety certified I/O module should be selected according to the functions it needs to perform within the machine. HYDAC describes I/O modules as components that communicate with processors and devices, regulate data flow and report status or errors. These functions need to align with the machine's control architecture.
Protection for Mobile Environments
Mobile equipment can operate in environments that expose electronic components to demanding conditions. HYDAC states that its I/O modules use compact, automotive-style housings suited to mobile applications in harsh environments. Physical protection therefore forms part of the overall component selection process.
Inputs, Outputs and Signal Processing
A safety certified I/O module can support the processing of digital and analogue signals required by a mobile control system. HYDAC's broader I/O technology includes digital and analogue inputs as well as PWM outputs, allowing different types of signals and control functions to be incorporated into the machine architecture.
Control and Timing Functions
I/O modules also contribute to control and timing by regulating data flow between a processor and connected external devices. HYDAC identifies processor communication, device communication, control and timing, data buffering and error detection among the functions of its I/O modules.
Error Detection and Status Reporting
Visibility of system status is important when control hardware is managing connected equipment. HYDAC explains that I/O modules can identify mechanical and data-related errors and report them to the processor. This provides information that can be incorporated into the wider machine control strategy.
Considering Expansion Requirements
Some mobile machines require more I/O capability as functions are added or the control system evolves. HYDAC's mobile control technology includes expansion modules with varied PWM outputs, internal current measurement and PID control functions. The required configuration depends on the machine and the control tasks involved. A safety certified I/O module can be considered where machine functions require an appropriate safety-oriented control architecture.
Safety and Control Architecture
The presence of a safety certified I/O module does not remove the need for an application-specific safety assessment. Engineers still need to consider the machine's safety functions, control architecture and applicable requirements when designing the complete system.
Selecting the Appropriate I/O Solution
The appropriate module depends on the number of signals, communication requirements, control functions and environmental conditions involved. A clear specification can help determine whether general-purpose or safety-certified I/O hardware is appropriate for the machine.
HYDAC Mobile Control Technology
HYDAC Australia offers safety-certified I/O modules as part of its mobile machine control technology. Reviewing the machine functions and system requirements before selecting the hardware can help create a control solution suited to the intended application.
Integrating Safety I/O Into the Control Architecture
A safety-related control design should account for the relationship between the I/O hardware and the rest of the machine. Inputs, outputs, processor communication and diagnostics need to work together within the intended architecture. Reviewing these elements at the design stage can make it easier to document the control arrangement and identify any additional hardware or software requirements.
Reviewing the Wider Control Requirements
The wider control system should also be reviewed when selecting a safety certified I/O module. Communication with the processor, device status reporting, error detection and signal handling all contribute to how the module fits into the machine. HYDAC's I/O technology includes functions for data communication, buffering and error reporting, while its expansion modules can provide additional PWM outputs and control capabilities.
HAllowing for Machine Development
Mobile machinery may require additional sensors, actuators or control functions as a project develops. Considering expansion requirements early can help engineers select hardware that remains appropriate as the machine architecture evolves. The final selection should remain based on the actual safety, signal and environmental requirements of the application.
