D6400 Modbus Analog Input Module


The D6400 analog input module contains seven differential inputs for measuring DC voltages, current signals such as 4-20mA and thermocouple temperature sensors. Each input channel can be configured to measure one of six voltage ranges, eight thermocouple types or a current input such as 4-20mA.

The D6400 performs all signal conditioning, cold junction compensation for thermocouples, a 16-bit analog to digital conversion, linearization and stores the result in a 16-bit unsigned integer format. The unsigned integer data values represent a percentage of the temperature input full scale range.

The data values are transmitted to any supervisory host computer that supports the Modbus RTU serial protocol.  See the links to a Modbus scaling example and product documentation below.

Download Datasheet

Download Manual

Modbus Scaling Overview

The D6400 analog input modules can be mounted on a DIN-rail using the MK-1 mounting kit.

Available on backorder

Additional Information

Dimensions 7.14 × 4 × 1.5 in
Voltage Ranges

+/-25mV, +/-50mV, +/-100mV, +/-1V, +/-5V, +/-10V

Current Range


Thermocouple Types

J, K, T, E, R, S, B and C


• 7CH Differential Volt, TC, Current Input Module
• User-selectable analog input range per channel.
• RS-485 serial communications interface.
• Modbus RTU Protocol.
• 500Vrms analog input or analog output isolation.
• 16-bit analog input measurement resolution.
• Continuous self-calibration
• Programmable analog input digital filters.
• Requires +10V to +30Vdc unregulated supply, 1.4W.
• Transient suppression on RS-485 data lines.
• Removable screw terminal plug connectors.
• CE marked.


The D6400 series analog input modules are compatible with all commercial software programs and OPC servers that support the Modbus RTU protocol. Commercials software programs from Wonderware, DreamReport, National Instruments Labview, Indusoft, DAQFactory and Dasylab all support the Modbus RTU protocol. OPC Servers from Kepware and MatrikonOPC support the Modbus RTU protocol.


• Process monitoring and control • Remote data logging to any host computer • Product testing

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