MVI46-MCM Modbus communication module


The MVI46-MCM uses N11 (Port 1) and N12 (Port 2) to setup the commands.

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The MVI46-MCM Internal Address matches the offset into the M1 table. The Reg Count matches the Length of the COP command. Read/Write perspective is from the PLX gateway, so the Prot Typed Read command is for moving data into the PLX gateway. Therefore, the N table reference matches the first COP command which was moving data into the MVI46-MCM module.


The Prot Typed Write command moves data into the PLC program and so uses the same N20 reference. After configuring the Modbus RTU commands identically on both products, and then configuring equivalent EtherNet/IP Class 3 Client commands as shown above, the PLX3x-EIP-MBS/4 gateway should function essentially as a drop-in replacement for the MVI46-MCM module.


MVI46-MCM Thermocouple signal isolators and thermocouple temperature transmitters belong to the category of isolators, both of which play a role in isolating and linearizing signals. Here is a list of their similarities:
(1) The measured signals are all thermocouple signals (K/S/E/B/R/T/J/N, etc.);
(2) Triple isolation of input, output, and power supply, with strong anti-interference ability;
(3) High linearity, stable long-term operation;
(4) The base and host can be separated and unplugged, making installation, disassembly, and maintenance convenient and simple;
(5) It can be used in conjunction with various instruments, DCS, PLC and other equipment;


Let’s take a look at the difference between thermocouple signal isolators and thermocouple temperature transmitters:
(1) Different output signals: The main function of thermocouple isolators is isolation, so the output signal and input signal are consistent, and can output one or two thermocouple signals. Thermocouple temperature transmitters not only have isolation function, but also have transmission function, which can convert the input thermocouple signal into other analog signals for transmission, and also output one or two analog signals.
(2) The parameters required for ordering are different: the thermocouple isolator only needs to know the graduation number and working power supply of the on-site thermocouple when ordering, while the thermocouple temperature transmitter needs to clearly know the temperature range corresponding to the output analog signal due to its transmission, so it can be set at the factory and cannot be changed on site.
(3) The temperature compensation components are different: the thermocouple isolator does not have a temperature compensation component, while the thermocouple temperature transmitter will have a temperature compensation component at terminals 1 and 3.


MVI46-MCM Output parameters

Output range: 4-20mA Output range: 1-5V
Load resistance: ≤ 250 Ω Load resistance: ≥ 250K Ω
Output range: 0-10mA Output range: 0-10V
Load resistance: ≤ 500 Ω Load resistance: ≥ 500K