Data Acquisition


Built-in Web Server
Support for both Modbus TCP and Modbus UDP Protocols
Communication Security
2-port Ethernet Switch for Daisy-Chain Topology
Dual Watchdog
I/O Pair Connection
Built-in I/O
AI: 4 Channels
AO: 4 Channels
DI/Counter: 4 Channels


The ET-7204 is a multi-function module with 4-channel analog inputs, 4-channel analog outputs, 4-channel digital inputs. It provides various programmable analog inputs (+/-500 mV, +/-1 V, +/-5 V, +/-10 V, +/-20 mA, 0 ~ 20 mA and 4 ~ 20 mA), and analog outputs (+/-5 V, +/-10 V, 0 ~ 20 mA and 4 ~ 20 mA). Each analog input is allowed to configure a proper range with 240 Vrms high voltage protection. Each analog input/output can be programmed to accept current or voltage as input/output depending upon the position of corresponding jumper.


Building Automation, Factory Automation, Machine Automation, Remote Maintenance, Remote Diagnosis, Testing Equipment.


 Built-in Web Server Yes


 CPU Module
 Watchdog Timer Module, Communication (Programmable)


 2-way Isolation Ethernet: 1500 VDC
I/O: 2500 VDC


 EMS Protection
 EFT (IEC 61000-4-4) ±2 kV for Power Line
 ESD (IEC 61000-4-2) ±4 kV Contact for Each Terminal
±8 kV Air for Random Point
 Surge (IEC 61000-4-5) ±2 kV for Power Line


 LED Indicators
 Status Run, Ethernet, I/O


 Analog Input
 Channels 4 (Differential)
 Type Voltage
 Range ±500 mV, ±1 V, ±5 V, ±10 V
0 to 20 mA, ±20 mA, 4 to 20 mA
(Jumper Selectable)
 Resolution 16-bit
 Accuracy Normal Mode: ±0.1%
Fast Mode: ±0.5% or better
 Sampling Rate Normal Mode: 10 Hz (total channels)
Fast Mode: 50 Hz (total channels)
 Input Impedance Voltage: 2 MΩ
Current: 125 Ω
 Common Voltage Protection ±200 VDC
 Overvoltage Protection 240 Vrms
 Overcurrent Protection 50 mA at 110 VDC (max.)
 Individual Channel Configuration Yes
 Open Wire Detection For 4 to 20 mA only
 Isolation ±400 VDC, Virtual Channel to Channel Isolation


 Analog Output
 Channels 4
 Type Voltage
 Range +0 to +5 VDC, ±5 VDC, +0 to +10 VDC, ±10 VDC
0 to 20 mA, 4 to 20 mA
(Jumper Selectable)
 Resolution 12-bit
 Accuracy ±0.1% of FSR
 Open Wire Detection For 4 to 20 mA only
 Voltage Output Capability 10 V @ 20 mA
 Current Load Resistance 400 Ω
 Individual Channel Configuration Yes
 Power-on Value Programmable
 Safe Value Programmable


 Digital Input/Counter
 Channels 4
 Type Dry Contact
Wet Contact
 ON Voltage Level Dry: Open
Wet: +1 VDC (max.)
 OFF Voltage Level Dry: Close to GND
Wet: +3.5 to +30 VDC
 Max. Counts 4,294,967,295 (32-bit)
 Frequency 100 Hz
 Min. Pulse Width 5 ms
 Effective Distance 500m (max.)
 Overvoltage Protection +30 VDC


 Ports 1 x RJ-45, 10/100 Base-TX
 LAN bypass Yes
 Security ID, Password and IP Filter
 Protocol Modbus TCP, Modbus UDP


 Reverse Polarity Protection Yes
 Consumption 4.9 W (max.)
 Powered from Terminal Block +12 to +48 VDC


 Dimensions (mm) 76 x 120 x 38 (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



ET-7204     CR  Ethernet I/O Module with 2-port Ethernet Switch, 4-ch AI, 4-ch AO and 4-ch DI (RoHS) 1