To monitor the data points of a Modbus device or entity, you must add them to the device or entity in Security Center.
Before you begin
- Obtain information about the data points that you want to monitor from the device provider.
- Make sure the data points that you want to monitor use a supported object type.
Procedure
- From the Config Tool home page, open the Plugins task.
- Select a Modbus device or entity.
-
In the Data points section, click Add a data
point ()
The Add a data point dialog box opens.
-
Enter the following information:
- Name
- The name of the data point.
- Modbus object type
- The object type of the data point. This can be a coil, a discrete input, a holding register, or an input register.
- Address
- The address of the data point on the device. You can enter the address in decimal format and then click Hex to convert it to hexadecimal.
- Bit range
- (Only for input register and holding register) Enable this option if you want to extract the data point value from a subset of bits. For more information, see Reading a specific bit range of a Modbus data point.
- Byte swap
- Enable this option if you want to extract the reading order of the bytes inside each register to be in little-endian.
- Value type
- The type of information reported by the input (data point). The
types of data and the possible values that can be reported are:
- Boolean
- True or False
- Int16
- -32,768 to 32,767
- UInt16
- 0 to 65,535
- Byte
- 0 to 255
- Access level
- Indicates whether the selected data point is read-only or read-write. This field is automatically displayed by the plugin role.
- Unit name
- (Optional) The measurement unit of the data point.
- Unit symbol
- (Optional) The symbol representing the measurement unit.
-
Click Add to add another data point or click
Add and Close.
The data point is displayed in the Data points section.
- Click Apply.