4-channel Counter/Incremental Encoder Interface Module | Model 2620

Model 2620 4-channel Counter/Incremental Encoder Interface ModuleView CE compliance report
  • Interfaces 4 advanced 32-bit counters to Ethernet
  • Quadrature decoders for incremental encoders
  • Removable terminal blocks for direct field wiring
  • Supplies 5V power for encoders
  • Connects to Ethernet through 2601
  • DIN-3 rail mountable


Model 2620 is a modular, four-channel counter/timer interface that connects to Ethernet through a 2601 communication module. It has four advanced 32-bit counter channels that can directly interface to incremental encoders as well as single-clock sources. Network latency is mitigated by providing timestamps along with all counter values read by the host computer. Model 2620 is a member of the 2600 series of smart I/O modules.

Several 2620s can be connected to a single 2601


Field Wiring

Four inputs are provided on each channel: enable, index, and two clocks. The clock and index inputs accept both differential RS-422 and single-ended TTL/CMOS compatible signals. Each channel has one output signal that can be used for PWM or pulse generation.

All field wiring is connected directly to the 2620 via removable terminal blocks, which are supplied with the module. These eliminate the need for external terminal blocks and make module installation and removal a snap.

Pinout of removable terminal block



Each counter channel can be independently configured to implement any of these popular functions:

  • Incremental encoder interface. The quadrature clock decoders have programmable x2/x4 clock multipliers that increase counting resolution for quadrature encoders. A counter can be forced to a preset value in response to a trigger signal on the index input or through software.
  • PWM generator. Any channel can be configured to produce a periodic output with a programmable period and duty cycle.
  • Pulse generator. An output pulse can be generated in response to a hardware or software trigger. The pulse duration is determined by a value in the preload register.
  • Frequency measurement. An internal time gate generator is provided for frequency measurement applications. Frequency can be measured by using the internal gate generator or an external gate signal.
  • Pulse width measurement. The width of a digital pulse can be measured when connected to the index input.
  • Period measurement. The period of a digital signal can be measured by connecting it to the index input.

Modular System

A 2620 module 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 2620. All inter-module communication circuits are optically isolated to prevent potentially disruptive ground loops.

Design assistant

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Resolution32 bits
Counter channels4
Count rate10 MHz, maximum
Input clock frequency maximums 2.5 MHz (quadrature x4)
5 MHz (quadrature/mono x2)
10 MHZ (quadrature/mono x1)
Derate for deviations from 50% duty cycle
Internal clock10 MHz
Mode of Operation Measurement Ranges
Incremental encoder0 to 10 MHz
Pulse generator100 ns to 214 s
PWM generator100 ns to 214 s
Single pulse width measurement100 ns to 214 s
Period measurementUp to 10 MHz
Freqency measurementUp to 10 MHz
Input/Output Signals
Clock input RS-422 differential
TTL/5VCMOS compatible
±7V CMV maximum
Index input RS-422 differential
TTL/5VCMOS compatible
±7V CMV maximum
Count enable inputTTL/5VCMOS compatible
Counter outputTTL/5VCMOS compatible
Device Power Outputs
Output voltage5VDC, ±5%
Output current400mA maximum, total for all channels
Fusesocketed 500mA fuse per channel
Mating Connectors
IOM port (qty 1)RJ-45 plug, AMP 554169 or equivalent
Counter I/O (qty 4) Pluggable TB, 10-pin, RIA 31166110 or equivalent
(included with module)
Operating range0 to 70 °C
Input power
(not including external device power)
+24V, ±5% (at 30mA)
Outer dimensions (W x H x D): 4.1 x 5.0 x 2.0 inches, including DIN mounting frame
Depth is specified with respect to surface of DIN rail support panel
Additional clearance required for field wiring


File Version Type Size
Technical Manuals
2600 Hardware Manual2.0.2PDF489 KB
2600 Programming Guide1.12.0PDF232 KB
Mechanical Drawings
Module Dimensions and Layout1.0.0PDF146 KB
CE Reports
CE Test ReportPDF817 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.
Interface Modules
26204-channel Counter/Incremental Encoder Interface Module$372$339
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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