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Model 2608 Series | Analog I/O via Ethernet
Features
  • 16 inputs of voltage, thermocouple, or 4-20 mA16-bit A/D, 15 -bit D/A
  • Up to 8 analog outputs with remote sensing
  • Auto standardization
  • Selectable input gain
  • All differential inputs
  • Watchdog Timer
  • Compatible with Linux and Windows
  • Use our design assistant to configure a system and calculate pricing

Description
This member of the 2600 series of smart I/O modules connects to an Ethernet via a 2601 communication module. It reads sixteen analog input voltages, including thermocouples, and has up to eight 15-bit D/A’s. The 2608’s microcontroller provides I/O services to the remote 2601 client via a category-3 cable.  The cable supplies isolated serial communication and power to the 2608’s microcontroller. 

Analog Inputs
Any one of the sixteen 16-bit analog inputs may be independently configured to read voltage, 4-20 mA current loops or thermocouples. The 2608 has built-in 500 ohm resistors for the current loops.

All measurements are made differentially to reduce common mode noise. All field wiring is connected directly to the 2608 via removable terminal blocks as shown in the photo. This minimizes downtime should it become necessary to replace a 2608 module. It also eliminates the need for separate terminal block assemblies.

I/O Modules
A wide range of I/O module types are available.  Each I/O module type has a specialized function such as analog I/O, thermocouples,  relays, digital I/O, etc.  A low-cost category-5 patch cable connects each I/O module to its Communication Module. Any combination of I/O modules may be connected to a Communication Module.

All I/O modules have on-board DC/DC converters to power module circuitry. This feature helps to prevent ground loops and associated common mode voltage problems when the I/O modules are distributed over long distances.  In addition, the inter-module communication circuits are optically isolated so as to eliminate communication ground loops.

Model 2601 Communication module
Model 2608-0 16 analog and TC inputs (16 bit)
Model 2608-4 16 analog and TC inputs (16 bit), 4 analog outputs (16 bit)
Model 2608-8 16 analog and TC inputs (16 bit), 8 analog outputs (16 bit)
Model 2610 48 digital I/O, 5VDC to 24VDCModel 2612
Model 2612 Strain Gauge via Ethernet
Model 2620 4 encoder/counter/frequency interfaces (32 bit)
Model 2650 8 relay outputs, 0V to 240V @ 10A
Model 2652 SSR I/O Module (Supports 8 SSRs)
Model 2653 SSR I/O Module (Supports 16 SSRs)
Model 204 Power supply, 24 VDC @ 5A


 
Design Assistant
Use our design assistant to help you configure a system unique to your specifications and calculate pricing.

Auto standardize
The 2608 has automatic standardization circuitry that periodically measures on-boards reference standards to update the gain and offset of the analog section.  Eight temperature sensors, four on each side of the module, are also sampled. Subsequent readings use the newest computed gain, offset and cold junction temperature.

Factory calibration constants are stored in non volatile memory so that 2608’s can be replaced without requiring field calibration.

Filtering
A 16-bit A/D digitizes all analog inputs and internal references at two milliseconds intervals.  Each input is measured four times in rapid succession and the averaged results are stored in on-board memory. Since this process is repeated every two milliseconds, the effective A/D sampling rate is 500 Hz per channel.

A more heavily filtered result is also available from averaging readings over 16 milliseconds. This has the effect of reducing 60 Hz line noise .A 50 Hz filter may also be chosen. Thermocouple and internal voltage references use this line filter. A jumper selectable RC filter is also available for thermocouples.

Analog Outputs
The 2608 is available with 0, 4 or 8 analog outputs. Each D/A converters produce +/- 10 VDC with a resolution of 15-bits.  All channels default to zero volts upon reset or power-up.

Each D/A has a 5-pin connector for external loads. Pin 3 is a remote sense line used to compensate line losses. Pin 5 is an optional power output line for powering external sensors with 24 or 10 VDC.

An on-board DC/DC converter produces all the required voltages from the 24 VDC supplied from the 2601 communication module.

Software and Manuals

Full-featured Windows 98/NT/2000/XP and Linux libraries are available below in the software development kit, along with comprehensive sample programs.

2600 Hardware Manual Released 9/16/08
2600 Programming Guide Released 9/16/08
2600 Software Development Kit Released 11/18/09

 

Specifications

Function
Power input 24 VDC, 80mA
Operating Temperature 0 to 70c
D/A 16 bit, 8 channel, +/- 10 V out
A/D 16 bits  ( 3.05 uV , 30.5 uV), +/- 10 V , +/- 100 mV, 500 samples/second for each channel,
Accuracy = 6.1 uV ,  60.1 uV
A/D  Thermocouples Range
E -190 to 0, 0 to 900 0.12 C, 0.04 C 0.24C, 0.08 C
J -190 to 0, 0 to 750 0.13C, 0.06 C 0.26 C, 0.12 C
K -90 to 0, 0 to 1300 0.2 C, 0.09 C 0.4 C, 0.1C
T -190 to 0,  0 to 390 0.2 C, 0.08 C 0.4 C, 0.16 C
B 100 to 500, 500 to 1300 3.2 C, 0.65 C 6 C, 1.3 C
N -190 to 0 0 to 300 0.27 C 0.12 C 0.54 C 0.24 C
R 0 to 300, 300 to 800 0.64 C, 0.32 C 1.28 C, 0.64 C
S 0 to300, 300 to 890 0.64 C 0.36 C 1.28 C, 0.72 C
Thermocouple Resolutions

Prices

Model 2600 Series Industrial I/O via Ethernet Please use our design assistant
Model 2601 Communication Module Qty 1: $463 Qty 2-9: $421
Model 2608-0 16 A/D inputs without D/A Qty 1: $418 Qty 2-9: $380
Model 2608-4 16 A/D inputs with 4 D/A outputs Qty 1: $475 Qty 2-9: $432
Model 2608-8 16 A/D inputs with 8 D/A outputs Qty 1: $532 Qty 2-9: $484
Model 204 24 V power supply Qty 1: $122 Qty 2-9: $122
Model 26C3 3 ft category-3 cable Call for current prices
Model 26C50 50 ft category 5E Call for current prices
Model 26C100 100 ft category 5E Call for current prices
Model 2600C1 Power Daisy Chain cable Qty 1: $14.55 Qty 2-9: $14.55
Model 2601C1 3 ft. Cat 3 or higher patch cable Qty 1: $10 Qty 2-9: $10
Model 2601C2 6 ft. Null modem cable Qty 1: $8 Qty 2-9: $8