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ESP32 PLC 21 CORE

ESP32 PLC for DIN rail with 13 inputs and 8 outputs, Ethernet, Wi-Fi, Bluetooth LE and RS-485, programmed with the Arduino IDE.

Ready-to-ship configuration, no expansion board.

I/O
13 inputs (6 analog 0-10 V), 8 outputs (3 analog/PWM)
Comms
Ethernet, Wi-Fi, Bluetooth LE, RS-485, RS-232, I2C, SPI
Programming
Arduino IDE over USB or Ethernet
Power
12 to 24 Vdc, DIN rail, IP20
Specifications, documents and projects
250.03 € 250.03 €

  • # CPU Type #
  • # Device #
  • # Inputs #
  • # Outputs #
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Need LoRa, 4G or CAN? See FLEX
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# CPU Type #: ESP32
# Device #: PLC
# Inputs #: 11-20
# Outputs #: 1-10



ESP32 PLC 21: ESP32 PLC with 21 I/O, Ethernet, Wi-Fi and RS-485

The ESP32 PLC 21 is an industrial controller from Industrial Shields built on the dual-core ESP32. It has 13 inputs (6 analog 0-10 V) and 8 outputs (3 analog/PWM), Ethernet, Wi-Fi, Bluetooth LE, RS-485 and RS-232, plus a real-time clock, and mounts on a DIN rail. It is programmed in C++ with the Arduino IDE and suits machine monitoring, data acquisition and control panels that mix analog sensors with digital signals.

You are viewing the CORE version. Ready-to-ship configuration, no expansion board.

See FLEX Configure RAM, options and expansion

Documents

Datasheets

Certificates

Brochures

Technical specifications

ProcessorESP32 dual core, up to 240 MHz, 16 MB flash, 520 KB SRAM
Inputs13: 6 analog/digital (0-10 V, 11-bit) and 7 digital optoisolated, 5 to 24 Vdc, 2 with interrupt
Outputs8: 3 analog/digital/PWM (0-10 V, 12-bit), 5 digital optoisolated, 5 to 24 Vdc
Ethernet1 x 10/100 Mbit, RJ45
WirelessWi-Fi 2.4 GHz, Bluetooth LE
Serial and busesRS-485 half duplex with 120 Ω termination, RS-232 and TTL serial selectable by DIP switch, I2C, SPI
Real-time clockDS3231 with backup battery (CR1216 or CR1220)
ProgrammingArduino IDE with the Industrial Shields ESP32 boards package, USB or Ethernet
Power supply12 to 24 Vdc with polarity protection
Mounting and protectionDIN rail TS35, IP20, inside a cabinet
ExpansionOne optional communication board: 4G LTE-M/NB-IoT (u-blox SARA-R412M), LoRa (EU, US or Asia band) or CAN (MCP2515). I2C expansion up to 127 modules

Projects built with the ESP32 PLC 21

Field-tested examples with code from the PLC Solution Library.

See all projects in the PLC Solution Library

Before you choose the ESP32 PLC 21

How do I program the ESP32 PLC 21?

With the Arduino IDE (1.8.0 or later). Add the Industrial Shields boards URL in Preferences, install the "industrialshields-esp32" package and select the ESP32 PLC 21. Upload through USB, or remotely over Ethernet.

Does it have relay outputs?

No. Its outputs are optoisolated digital and analog/PWM outputs. If you need relays, look at the ESP32 PLC models with relay outputs, such as the 19R, 38R or 57R.

Can the analog inputs read 4-20 mA sensors?

The analog inputs measure 0-10 V with 11-bit resolution. To read a 4-20 mA loop, add a precision shunt resistor (500 Ω turns 20 mA into 10 V) and scale the reading in your program.

Does it support LoRa, 4G or CAN?

Not in the CORE version, which ships without an expansion board. The FLEX version takes one board: LoRa, 4G LTE-M/NB-IoT or CAN.

Can I expand it with more I/O?

Yes. The ESP32 PLC family connects up to 127 expansion modules over I2C, and you can add remote I/O over Modbus RTU with moduleX.