Analog I/O Module | Model 2608

Model 2608 Analog I/O ModuleView CE compliance report
  • Interfaces analog I/O signals to Ethernet
  • Sixteen 16-bit differential analog inputs
  • Up to eight 15-bit analog outputs with remote sense
  • Measures voltage, thermocouple, and 4-20 mA
  • Integral cold-junction compensation for thermocouples
  • Fully electronic calibration
  • Directly connects to field wiring
  • Connects to Ethernet through 2601 I/O system hub
  • DIN-3 rail mountable


Model 2608 is an analog I/O module that connects to Ethernet through a 2601 communication module. It has sixteen differential analog inputs and 0, 4, or 8 (model 2608-0, 2608-4, 2608-8) single-ended analog outputs. It is a member of the 2600 series of smart I/O modules.

Analog Inputs

Each analog input may be independently configured to measure voltage, thermocouple, or 4-20 mA current loop. The module has built-in 500 ohm resistors for current loop measurements, and cold-junction compensation sensors for thermocouple measurements. Dedicated input channels are used for cold-junction compensation sensors so that all sixteen external inputs will remain available for application use.

All analog inputs are fully differential so that common mode noise will be reduced or eliminated from measurements. Field wiring is connected directly to the 2608 through removable terminal blocks—no external breakout boards are needed.

Modular System

The 2608 can be connected to any of the sixteen IOM (I/O module) ports on the 2601 with a low-cost category-5 patch cable, which provides all operating power and communication signals needed by the 2608. All inter-module communication circuits are optically isolated to prevent potentially disruptive ground loops.

Interfacing a large number of analog signals to one Ethernet port


Design assistant

Use the Design Assistant to quickly design a system and calculate pricing.


Analog inputs
Channels16 differential
Resolution16 bits
Input ranges±10 V, ±100 mV
Conversion Time500 samples/second for each channel
Accuracy6.1 µV (10 V range), 60.1 µV (100 mV range)
CMV range±10 V
Thermocouple Resolution

Analog Outputs
Channels0 (2608-0)
4 (2608-4)
8 (2608-8)
Resolution15 bits
Output voltage range±10 V
Output current2 mA, max
Power and Environmental
Power input24 VDC, 80mA
Operating temperature0 to 70 °C
Mechanical dimensions(W x H x D): 8.62 x 4.87 x 2.62 inches; 219 x 124 x 67 mm


File Version Type Size
2600 Hardware Manual2.0.2PDF489 KB
2600 Programming Guide1.12.0PDF232 KB


File Version Type Size
2600 Software Development Kit
For Linux and Windows
1.1.14ZIP1.58 MB
2600 Labview Drivers1.0.0ZIP542 KB
Other Operating Systems
Need a software development kit for another operating system? We can port our SDK to
your OS or provide the information you need to do it yourself. Contact Sales for details.

Pricing & Ordering

Model Description Qty 1 Qty 2-9 Order Qty.
2608-0Analog I/O Module, 16-in/0-out$451$411
2608-4Analog I/O Module, 16-in/4-out$514$466
2608-8Analog I/O Module, 16-in/8-out$574$523
2601I/O Communication Module$501$455
Power Supplies
20424 V 120 Watt power supply$139$139
2601C1Cable, Category 5e patch, 3 ft$11$11
26C50Cable, Category 5e patch, 50 ftCallCall 
26C100Cable, Category 5e patch, 100 ftCallCall 

Design assistant

Use the Design Assistant to quickly design a system and calculate pricing.

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