Points Tab - Metasys - LIT-12011931 - Supervisory Device - Network Engine - 10

VMD Generator Express Application Note

Product name
Network Engine
Document type
Application Note
Technical Bulletin
Document number
LIT-12011931
Version
10
Revision date
2017-06-01

The Points tab is structured as a table and is the primary user interface for the VGE tool.

Green columns indicate Metasys system parameters and blue columns indicate Modbus protocol parameters.

Figure 1. Points Tab

Table 1. Point Field Configurations Descriptions
Field Description
Vendor Configuration Data (VCD) VCD is the reference used inside of a Metasys object.
General Parameters (Green Header)
Object Type This point object class can be AI, AO, BI, BO, MI, or MO. Depending on the object type selected, the other columns are activated.
Unique ID 1 The unique identifier of the object in Metasys. The maximum length of this field is 32 characters and it cannot contain special characters.
Description 1 The description of the object in Metasys. The maximum length of this field is 40 characters.
Units The engineering units for the analog objects (AI and AO). This value can be selected from the list of available units into Metasys.
States Text The text used for the binary (BI and BO) and multi-state (MI and MO) objects. This value can be selected from the list of available states text into Metasys.
Display Precision The display precision for analog objects (AI and AO). This value can be selected from the list of available display precision in Metasys.
Modbus Parameters (Blue Header)
Function

Modbus function related to the point. This value can be:

  • Coil Status (Function 1)
  • Input Status (Function 2)
  • Holding Register (Function 3)
  • Input Register (Function 4)

Additional “dummy” function codes for internal use are available:

  • Coil Status (Write Only) (Function 11); used for the coils that support only the write commands but not the read commands.
  • Holding Register (Write Only) (Function 13); used for the registers that support only the write commands but not the read commands.
Address The Modbus address of the Register. This value is zero-based.
Reference The complete Modbus reference in the Modicon format. This value is one-based. This field is read-only and calculated from the Function and Address fields.
Data Type A format that must be applied to the data coming from Modbus. Example: SIGN16 means value express on 16 bits with sign (from -32768 to 32767).
Mathematical Function

A formula that must be applied to the value coming from Modbus. For some formulas, Slope (m) and Intercept (q) fields are required.

Example: y=m*x+q

Slope (m) The multiplication or division factor (according to the formula used) applied to the value coming from Modbus.
Intercept (q) The offset value (according to the formula used) applied to the value coming from Modbus.
Conversion Table The list of values that convert the value coming from the field into the value that is available into the NIEx9 user's interface. It is typically used to convert an integer into Metasys Multi-state (MI, MO) or Binary (BI, BO).
Miscellaneous (Orange Header)
Comment 1 Used to add additional information related to the specific row.
1 The string fields Unique ID, Description, and Comment accept only ASCII characters. All characters, different from the standard ASCII, are considered invalid and generate an error if used.