..  Copyright (C) 2020-2023 Evolabel AB. All rights reserved.

    Author: Martin Forsberg

.. _plc-index:

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PLC Support
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This section describes some different ways to control an Evolabel printer from a PLC.
Multiple Evolabel devices are controlled by PLCs. These integrations are made by our skilled partners. 

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Digital I/O and I/O rules
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`I/O-Rules <https://docs.evolabel.com/ui/development/settings/peripherals/io_rules.html>`_ make it possible to execute system requests when an input changes state, or set outputs from system events.

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Modbus TCP
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Evolabel printers provide a `Modbus TCP <https://docs.evolabel.com/integration/modbus.html>`_ Server interface which can be accessed on port 502.

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Sending variable print data
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Most modern PLC can send raw variable data through to a network port on a device.
It should therefore be possible to send `JSON-RPC <http://docs.evolabel.com/api/latest>`_ or `XML <https://docs.evolabel.com/integration/xml.html>`_ data from the PLC to the printer.

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PLC configuration files for Evolabel devices
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Evolabel do not provide PLC configuration files.