---
title: "CLICK Basic PLC, 24 VDC required, serial ports, Discrete Input"
url: "https://maker.wiznet.io/eric_g/resellers/click-basic-plc%2C-24-vdc-required%2C-serial-ports%2C-discrete-input/"
markdown_url: "https://maker.wiznet.io/eric_g/resellers/click-basic-plc%2C-24-vdc-required%2C-serial-ports%2C-discrete-input/md"
type: "VAR: Value-Added Reseller Products"
author: "automationdirect"
author_url: "https://www.automationdirect.com/adc/overview/catalog/programmable_controllers/click_plcs_%28stackable_micro_brick%29/plc_units"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "automationdirect"
original_url: "https://www.automationdirect.com/adc/overview/catalog/programmable_controllers/click_plcs_%28stackable_micro_brick%29/plc_units"
published: "2022-10-04"
language: "en"
likes: 7
views: 1378
comments: 1
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# CLICK Basic PLC, 24 VDC required, serial ports, Discrete Input

> The PLC CPU is the brain of the control system and contains a microprocessor, memory storage, and other integrated circuits.

Original author: automationdirect (source: https://www.automationdirect.com/adc/overview/catalog/programmable_controllers/click_plcs_%28stackable_micro_brick%29/plc_units)

## Article

The PLC CPU is the brain of the control system and contains a microprocessor, memory storage, and other integrated circuits that are used to execute the control program, store logic data, and communicate to external devices. PLC CPUs follow a repeated sequence of operations that perform those functions and other internal processes. Below is an example of a typical PLC scan.

CLICK PLC units contain the CPU and a fixed set of up to 14 I/O points in a compact form factor. Thirty-one stand-alone PLC combinations are available with varying I/O configurations including 8 DC inputs with 6 DC outputs, 8 AC inputs with 6 relay outputs, and units offering 2 analog inputs and outputs with 4 discrete inputs and outputs.

- Basic and Standard PLCs feature discrete-only inputs and outputs; Analog PLCs feature both discrete and analog I/O

- Basic PLC units have two built-in RS-232 communications ports - one programming port and one that can be configured for either Modbus RTU or ASCII protocols

- Standard and Analog PLCs include the same ports as the Basic PLCs with an additional RS-485 communications port

- All CLICK Ethernet-capable PLCs have one built-in Ethernet communications port that supports Modbus TCP and EtherNet/IP protocols and one RS-232 serial comm port

- Ethernet Standard and Ethernet Analog PLC units also have an RS-485 port for Modbus and ASCII communication

- Up to 8 stackable I/O modules can be connected to a CLICK PLC unit to expand the system I/O count and meet the needs of a specific application

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Source: https://maker.wiznet.io/eric_g/resellers/click-basic-plc%2C-24-vdc-required%2C-serial-ports%2C-discrete-input/