IO models mediate between the processor and the input and output devices. The range of IO devices available is diverse. Incorporating peripheral device logic for all of them into the CPU is next to impossible. They tend to be slower than the CPU; hence directly using them on the high-speed bus is not recommended. Hence, you need an IO module to facilitate data exchange between the external devices and the main memory or CPU registers. Choosing an appropriate IO module is easy if you consider a few aspects.
Different Output Modes
Consider your purpose behind buying an IO module. What are your needs? Accordingly, choose an output mode and find an IO module that offers it. Some brands sell IO modules that offer both NPN or PNP output, and you can switch between them according to your requirements. A module that has both can be used in a greater range of activities.
Design of the module
We mean it in a utilitarian, not aesthetic, sense. Check the wired interface and wire units and how many terminals it has. See if they are enough for you. Some IO modules mark their connect points clearly for ease of use. For convenience, you can also get a module that has indicator lights for each channel. Sizing of the terminal matters too, and a compact-sized one can be helpful. If it comes with features like a DIN rail on its back, installing and removing it becomes easier.
Material of construction
Check what the IO module is made of to estimate how durable, stable and safe it is. If it is made of materials like engineering plastic, you can be assured of its resilience. Make sure only high-grade materials are used.
Will it function smoothly?
Take a look at aspects like the output response speed, input refresh rate of the module, baud rate support and communication interface to estimate how fast and efficient the IO module can be expected to be.
Categories Simillar to IO Modules includes Current Switches, Magnetic Switches and Tactile Switches