Here’s an example of such logic which leverages a FOR Loop & applies debouncing to all the inputs.īased on the logic above, it’s extremely simple to apply to all the inputs as well as outputs from the same routine. Essentially, it’s just a TON Instruction which monitors the input and will set an internal bit to HIGH once the input has been set for a defined time. To counter this phenomenon, a debounce routine is introduced. This occurs frequently in a real-world scenario. In other words, instead of counting one box, the photo-eye is set high, low and then high again by the surface. As the box travels into the area, the photo-eye may be triggered a few times due to the edge of the box and miscount. Allow me to elaborate.Ĭonsider a photo eye which is looking to count boxes & is tied to an input. This logic allows me to monitor the status of the input or output bit in order to set an internal bit after it has been on or off for a certain period of time. One of the most common pieces of logic I like to apply to my inputs and outputs is called debouncing. Manipulating Inputs & Outputs at The Source Even within your own programs, you’ll often go through the exercise of figuring out where each point of IO has been used, how it’s mapped and how it will be updated. This may seem easier from a programming standpoint as you’ll have fewer rungs, but it quickly becomes very confusing. The alternative method would be to access the same input and output bits from all over your PLC program. Furthermore, this allows you to easily commission your system as you will need to verify each input and output once it’s deployed and installed in the field.
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This allows you to scroll through, see their status and identify issues in the system. Inputs & Outputs Managed from a Single Programīy following the implementation outlined above, you will have access to all the inputs and outputs from within the same program.
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Although this practice doesn’t seem like a big deal, we will explore the reasons for doing so below. The above practice is called IO mapping or buffering.
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Similarly, each output tag which comes from the PLC will need to be mapped to the corresponding output. For example, in Studio 5000, you’ll need to map as follows:Įach input will receive a corresponding tag on the PLC side. In other words, each input module which specifies input tags will need to be mapped to internal PLC tags. The simplest way to map inputs & outputs is to create a routine which will contain the tags linked to the modules & set them through OTE Instructions.
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Lastly, we will give you real-world scenarios in which this practice is important. In this article, we will be giving you an in-depth overview of IO buffering, discussing why it’s important & what you can accomplish through this practice. Furthermore, having these assets within a single program greatly reduces the time to troubleshoot and commission new systems.
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The necessity to manipulate may come from hardware failure or need to upgrade or expand the system. It allows one to contain all the primary input & output tags within a single program & easily manipulate them as needed. IO Mapping or Buffering can help you in multiple ways. Although this task is fairly straightforward, many programmers either avoid it or implement it incorrectly due to their misunderstanding of it. One of the first tasks of PLC Programming is to properly map Inputs & Outputs.