Data Acquisition


  • Built-in Web Server
  • Cost-effective Tiny Ethernet I/O Modules
  • Support Modbus TCP/UDP and MQTT Protocols
  • I/O Pair Connection (Push and Pull)
  • Redundant power inputs: PoE (IEEE 802.3af, Class 1) and DC input
  • Supports Dual-watchdog
  • Supports Web Configuration and Firmware Update Via Ethernet
  • DO Power-on and Safe Value


Providing various digital I/O functions, the tET/tPET series is an IP-based Ethernet I/O monitoring and control module. The module can be remotely controlled through a 10/100 M Ethernet network by using Modbus TCP protocol. Modbus has become a de facto standard communications protocol in industry and is now the most commonly available means of connecting industrial electronic devices. This makes the tET/tPET series perfect integration with the HMI, SCADA, PLC, and other software systems.

The functionality of the tET/tPET series is almost the same as the ET-7000/PET-7000 series. The tET/tPET series tiny Ethernet I/O modules support various I/O types, like photo-isolated digital input, relay contact, photoMOS relay, and open-collector output. The module can be used to create DI to DO pair-connect through the Ethernet. Once the configuration is completed, the tET/tPET series module can poll the status of local DI channels and then use the Modbus/TCP protocol to continuously write to a remote DO device in the background.

The tET/tPET series provides a dual watchdog: CPU watchdog and host watchdog. The CPU watchdog automatically resets itself when the built-in firmware runs abnormally. The host watchdog monitors the host controller (PC or PLC), and the output of the module can go to a predefined state (safe value) when the host fails.

For maximum space savings, the tET/tPET series is offered in an amazing tiny form factor that makes it can be easily installed anywhere, even directly embedded into a machine. It is equipped with two removable terminal block connectors for easy wiring and features a powerful 32-bit ARM MCU to handle efficient network trafficking. The tPET series offers true IEEE 802.3af-compliant (classification, Class 1) Power over Ethernet (PoE) using a standard category 5 Ethernet cable to receive power from a PoE switch like the NS-205PSE. When there is no PoE switch on site, the tPET series accepts power input from the DC adapter.


Factory, Building, and Home Automation Remote Maintenance


 CPU Module
 CPU 32-bit ARM
 Watchdog Timer Module, Communication (Programmable)


 EMS Protection
 EFT (IEC 61000-4-4) ±4 kV for Power Line
 ESD (IEC 61000-4-2) ±4 kV Contact for Each Terminal
±8 kV Air for Random Point


 LED Indicators
 Status Run, Ethernet


 Digital Output
 Channels 4
 Type Open Collector
 Sink/Source (NPN/PNP) Source
 Load Voltage +10 to +40 VDC
 Load Current 650 mA/channel
 Overvoltage Protection +48 VDC
 Short-circuit Protection Yes
 Isolation 3750 Vrms


 Ports 10/100 Base-TX, 8-Pin RJ-45 x1 (Auto-negotiating, Auto-MDI/MDIX, LED indicator)


 Consumption 1.0 W
 Powered from Terminal Block +12 to +48 VDC


 Dimensions (mm) 52 x 95 x 27 (W x L x H)
 Installation DIN-Rail mounting


 Operating Temperature -25 ~ +75 °C
 Storage Temperature -30 ~ +80 °C
 Humidity 10 to 90% RH, Non-condensing



tET-A4     CR  Tiny Ethernet Module with 4-ch (Source-type, PNP) DO (RoHS) 1