At a glance
Comparison summary
Selecting a MicroPLC usually means struggling with trade-offs that rarely fit one datasheet row. Buyers are typically juggling signals at the edge (digital, analog, maybe slow serial devices), how data gets off the machine (Ethernet, cellular path, Wi-Fi, redundancy), how alarms and dashboards will work remotely (protocols, cloud/broker flexibility, tooling cost), how fast teams can iterate (programming model, AI tooling, validation, updates), and how the hardware grows with more points or phases (I/O density, modular expansion, interoperability with existing plant gear). Across all of those dimensions, the EQSP32 comes out ahead, and the table below shows exactly why.
| Feature |
EQSP32
Erqos
|
LOGO! 8
Siemens
|
Opta
Arduino Pro
|
|---|---|---|---|
| Electromechanical | |||
| DIN Rail Mount | ✓ | ✓ | ✓ |
| Terminals | Screw | Screw | Screw |
| Physical display | App & webIO Status can be monitored in realtime on Smartphone App | LCD | No |
| Dimensions | 71×90×57 mm | 72×90×55 mm | 130×75×44 mm |
| Onboard buzzer | ✓ | No | No |
| CE / RoHS Certified | ✓ | ✓ | ✓ |
| Power Supply | |||
| Supply voltage | 10–28V DC | 12–24V DC | 12–24V DC |
| 5V regulated output | ✓ 1AUseful for powering sensors | No | No |
| Power supply monitoring | ✓Main power supply and 5V output voltage are monitored at all times | No | No |
| Processor | |||
| Model | ESP32-S3 | Undisclosed | STM32H747 |
| Cores / speed | Dual core, 240 MHz | Undisclosed | Dual core, 480 MHz |
| Architecture | Open | Closed | Open |
| Real-Time OS | ✓ | ✓ | ✓ |
| On-device ML / AI acceleration | ✓ | No | Limited |
| Wireless Connectivity | |||
| WiFi | ✓ | No | WiFi variant only |
| Bluetooth BLE 5.0 | ✓ | No | WiFi variant only |
| LoRa | CL modelNot available on Wired Ethernet model | No | No |
| External antenna | OptionalExternal antenna can be used to extend WiFi and BT range | No | No |
| Cellular (2G / GSM) | Via EQX2G module | No | No |
| Wired Internet | |||
| 10/100 Ethernet | ✓ | ✓ | ✓ |
| Wired Communication | |||
| RS485 | ✓ | ✓ | ✓ |
| Modbus Master | ✓ | ✓ | ✓ |
| Modbus Slave | ✓ | Limited | Limited |
| RS232 | ✓ | No | No |
| CAN Bus / CANopen | ✓ | No | No |
| SAE J1939 | ✓ | No | No |
| DMX512 | ✓ | No | No |
| Dual RS485 port | Build option | No | No |
| Programming & Updates | |||
| Programming connector | USB-C, front | Proprietary | USB-C, side |
| OTA firmware updates | ✓ | No | Limited |
| Traditional PLC languages (IEC 61131-3) | ✓ via OpenPLCSupported OpenPLC target: Ladder Diagram, Structured Text, and Function Blocks with the free, open-source OpenPLC editor and runtime | ✓ FBD / LAD | ✓ IEC 61131-3 |
| Development tools | Free, open-source | LOGO! Soft Comfort (paid) | Arduino / PLC IDE (free*) |
| Commercial license required | Not required | Yes | Unclear (CODESYS runtime) |
| 3rd party libraries | 10,000+ (ESP32 ecosystem)EQSP32 is based on ESP32 which has the largest following compared to the other processors in this table | None | Limited (STM32) |
| AI-assisted programming | ✓ EQ-AI | No | No |
| Hardware-in-the-Loop (HIL) test mode | ✓ nativeInputs are injected and outputs read back over USB while the identical control logic runs on the real controller. A standard, free feature of the EQSP32 library | No | No |
| Agentic AI development (unattended) | ✓ with HILAn AI agent writes, compiles, and flashes the entire application, then validates its own work on the real controller through Hardware-in-the-Loop. A PLC-world first | No | No |
| Inputs & Outputs | |||
| Total I/O ports | 16 | 12 (8 in + 4 out) | 12 (8 in + 4 out) |
| Individually reconfigurable I/O | ✓ | No | No |
| Digital inputs (24V tolerant) | ✓ all 16 | ✓ 8 | ✓ 8 |
| Analog inputs (0–10V) | ✓ 8 ports, 12-bit | Via module | ✓ 8 ports |
| 4–20 mA current loop inputs | ✓ 8 ports, 12-bit | Via module | No |
| NTC thermistor input | ✓EQSP32's 5V output is used to power the thermistor and provide a reference for higher precision measurement | No | No |
| Output type | MOSFET open-collectorMOS Drivers offer much higher flexibility and protection compared to mechanical relays that can only be Off/On | Relay / transistor | Relay |
| PWM outputs | ✓ all 16, 10-bitPWM allows dimming LEDs and adjusting current in solenoids. | Limited | No |
| Smart Coil drive (pickup-to-hold derating) | ✓ | No | No |
| On-board inductive flyback protection | ✓ | No | No |
| High-speed digital output | ✓ up to 1 MHz | No | No |
| Hardware pulse counters | ✓ 4 ch, up to 500 kHz | 2 channels | No |
| Encoder input | ✓ | No | No |
| Analog outputs (0–10V) | ✓ 2 native | Via module | No |
| AC relay outputs (mains voltage) | Via EQXRA82 moduleEQSP32 connects to up to 16 external relays | ✓ up to 10A | ✓ up to 10A |
| Output surge protection | ✓ all portsMOS Drivers are current and thermally protected. Relays can only be protected with external fuse or circuit breaker | No | No |
| Expansion Modules | |||
| Expansion port | ✓ | ✓ | No |
| Max expansion modules | 15EQXpansion module interface to very diverse device types, including PT100 RTD sensing. Typical PLC expansion modules are generic Analog Inputs and Relay Outputs. | Limited | No |
| Digital I/O expansion | ✓ EQXIO (10 ch) | ✓ | No |
| Analog input expansion | ✓ EQXAI | ✓ | No |
| Relay output expansion | ✓ EQXRA82 (8 ch) | ✓ | No |
| Thermocouple module | ✓ EQXTC (6 ch) | No | No |
| PT100 RTD module | ✓ EQXPT (2/3/4-wire) | No | No |
| pH sensor module | ✓ EQXPH | No | No |
| Cellular module (2G/GSM) | ✓ EQX2G | No | No |
| Software & IoT | |||
| IoT protocols (MQTT / HTTP / REST) | ✓ | Modbus TCP only | Limited |
| MQTT auto-discovery (Home Assistant) | ✓ | No | No |
| Built-in web server | ✓ free | Paid add-on | No |
| NTP time sync (automatic) | ✓ | No | No |
| Automatic daylight saving | ✓ | No | No |
| OTA firmware updates | ✓ | No | Limited |
| Cloud connectivity | Any MQTT brokerSupplied and supported by Erqos. Additional tools and utilities can be found in open source communities | Paid (SIMATIC Cloud) | 3rd party |
| Smartphone provisioning app | ✓ EQConnect | No | No |
| Live I/O diagnostics app | ✓ EQConnectIO Status can be monitored in realtime on Smartphone App | No | No |
In the EQSP32 column, the blue “i” buttons show brief notes matching our full comparison page.
Competitor data based on publicly available specifications at time of writing. Some Logo! 8 variants differ in I/O count and connectivity. Arduino Opta WiFi/RS485 variants may vary.
Spotted an error? Let us know.