Modbus Read Channel Properties

NI InsightCM™ 3.3 Help

Edition Date: December 2018

Part Number: 374498G-01

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Location: Click the Action menu on the Asset Configuration page and select Data Sources.

The Modbus Read channel type supports the following properties that you configure to affect how the channel performs acquisitions.

Property Name Description
Register Type
  • Discrete Input—The register addressed represents a sensor input or other Boolean value to read.
  • Coil—The register addressed represents a output or internal bit to read.
  • Input Register—The register addressed represents an analog input value or other integer value to read.
  • Holding Register—The register addressed represents an analog output or internal number to read.
Address The address of the Modbus Register to read.
32-bit data type If true, 32 bits will be read from the Register at the specified Address.
First word low in 32-bit data types If checked the 32 bit value read from the Register will have the low order word in the first 16 bits.
Unit Specify the unit to be used for the Engineering Value read from the Register.
Slope The slope value, represented by m in the following equation: Engineering Value=m(Raw Value)+b.
Offset The offset value, represented by b in the following equation: Engineering Value=m(Raw Value)+b.
Range Check If true, the device checks engineering values to see if the maximum and minimum range values are exceeded, and if so, returns an error by reporting the channel status is out of range.
Range Check: Minimum When Range Check? is true, the minimum value, after any scaling, the device can measure before the device returns an error by reporting the channel status is out of range.
Range Check: Maximum When Range Check? is true, the maximum value, after any scaling, the device can measure before the device returns an error by reporting the channel status is out of range.
Sample Mode Displays that a Modbus channel acquires a single-point measurement at the interval you specify for the Modbus device.

Related Information

Configuring a Data Source

Permission-Based Access to the NI InsightCM Web Application

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