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  • 5 Universal Inputs (0-5V, 0-10V, 0-20 mA, thermistor, dry contact or open-collector)
  • 7 Digital Inputs (dry contact or open-collector)
  • 4 Analog Outputs (0-10V)
  • 7 Digital Outputs (relay N.O.)
  • Battery Back-up Real Time Clock

The Smart I/O™ EC231 programmable controller incorporates 23 channels of cost effective analog and digital I/O with a real time clock. The I/O is monitored and controlled by a Neuron 3150 chip with Free Topology communication over a LonWorks® network. The EC231 has expanded data storage with additional FLASH, SRAM and EEPROM memory. The I/O of the EC231 makes it perfect for a variety of equipment control applications. The wide temperature range, -20 to 70 °C, makes the EC231 well suited for indoor and outdoor use.

The seven digital inputs can interface to a variety of devices such as alarms, switches, occupancy sensors and many other digital type application devices. The digital relay outputs can be used to control HVAC outputs, small motors, valves, alarm outputs, lights, or other loads where the current does not exceed 1A at 24 Vac. The EC231 controller is protected from reverse power supply input wiring, over-voltages, transients, and other common events that can damage unprotected inputs and outputs.

The versatile complement of I/O allows numerous applications to be development and implemented with the EC231. The Real Time Clock and expanded memory allow applications for data logging, scheduling and time stamp monitoring and control.

User defined algorithms and functions can be programmed using VisualControl, NodeBuilder or other third party LONWORKS programming tools. The program can be downloaded over the free topology network and is stored in non volatile memory so it is retained even after loss of power.

The enclosure snaps right onto a 35mm DIN-rail for quick and easy mounting. Its spring-loaded latching mechanism makes it easy to remove.


Communication: LONTALK Protocol
Transceiver: FTT-10A, Free Topology
Processor: Neuron 3150 @ 10MHz
Memory: 64Kbytes Flash (External), 2 Kbytes RAM (Neuron), 24K bytes SRAM (External)*, 0.5K bytes EEPROM (Neuron), 8K bytes Serial EEPROM (Ext.)
Clock: Real Time Clock
Back up: Super Cap
Application: Fixed, non-programmable


Nominal Input Voltage: 24 VAC/VDC
Input Voltage Range: 21-28 VAC or 21-39 VDC
Maxium Consumption: 6 VA, does not include relay loading
Protection: +20V Outputs protected with 170mA auto-reset fuse


Operating Temperature: -20°C to +70°C, -4°F to 15 8°F
Storage Temperature: -40°C to +70°C, -40°F to 158 °F
Relative Humidity: 5% to 95% (non- condensing)


Period: 2 Years (Limited)

Digital Inputs

Number: 7
Type: Dry Contact
Protection Circuitry: Transient Over voltage, ESD

Analog Inputs

Number: 5
Voltage: 0-5 Volts, 0-10 Volts
Current: 0-20 mA
Thermistor: Type 2, 3: 10Kohms, (25°C,77°F)
Resolution: 12 bits
Accuracy: ±1% FS (25°C, 77°F)
Protection Circuitry: Transient Over voltage, ESD

Digital Outputs

Number: 7
Type: Relay (N.O.), 1 A @ 24 V, Voltage Sourcing

Analog Outputs

Number: 4
Voltage: 0-10 Volts
Current: 4-20 mA
Resolution: 10 bit
Accuracy: ±1% FS (25°C, 77°F)
Protection Circuitry: ESD


Standard model


10000 St Clair Avenue

Fairview Heights, IL 62208


(618) 394-0300