PROSOFT MVI56-MNETC MODBUS TCP/IP client communication current


PROSOFT MVI56-MNETC Insert the RJ45 cable connector into the Configuration/Debug port of the module

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The MVI56-MNETC Client x Commands section of the configuration sets the Modbus TCP/IP Client command list. This command list polls Modbus TCP/IP server devices attached to the Modbus TCP/IP Client port. The module supports numerous commands. This permits the module to interface with a wide variety of Modbus TCP/IP protocol devices.

The function codes used for each command are those specified in the Modbus protocol. Each command list record has the same format. The first part of the record contains the information relating to the MVI56-MNETC communication module, and the second part contains information required to interface to the Modbus TCP/IP server device.

In order to interface the module with Modbus TCP/IP server devices, you must construct a command list. The commands in the list specify the server device to be addressed, the function to be performed (read or write), the data area in the device to interface with, and the registers in the internal database to be associated with the device data.

The MVI56-MNETC Client command list supports up to 16 commands. The command list is processed from top (command #1) to bottom. A poll interval parameter is associated with each command to specify a minimum delay time in tenths of a second between the issuances of a command. If the user specifies a value of 10 for the parameter, the command will be executed no more frequently than every 1 second.

This field specifies the database address in the module’s internal database to use as the destination for data brought in by a read command or as the source for data to be sent out by a write command. The database address is interpreted as a bit address or a 16-bit word (register) address, depending on the Modbus Function Code used in the command.

 For Modbus functions 1, 2, 5, and 15, this parameter is interpreted as a bitlevel address.

 For Modbus functions 3, 4, 6, and 16, this parameter is interpreted as a wordlevel or register-level address.

This parameter defines if and how the order of bytes in data received or sent is to be rearranged. This option exists to allow for the fact that different manufacturers store and transmit multi-byte data in different combinations. This parameter is helpful when dealing with floating-point or other multi-byte values, as there is no one standard method of storing these data types. The parameter can be set to rearrange the byte order of data received or sent into an order more useful or convenient for other applications. The following table defines the valid Swap Code values and the effect they have on the byte-order of the data.


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The data can be automatically displayed in cycles according to the set time interval;
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Capable of setting parameters such as PT and CT on site;