MVI94-MCM Master/Slave Network Modbus Communication Module

Description

MVI94 MCM Functions and Features
Working principle: Direct measurement (open loop) Hall current sensor – The magnetic flux generated by the primary current is gathered in the magnetic circuit, and the magnetic field intensity is linearly converted into a Hall voltage signal by a Hall element. After amplification and conversion by an amplifier, the output signal can accurately reflect the primary current. Magnetic balance type (closed-loop zero magnetic flux) Hall current sensor – The magnetic flux generated by the primary current is balanced with the magnetic flux generated by the secondary current generated by the amplified voltage of the Hall element through the secondary coil; The secondary current accurately reflects the primary current.
Product advantages: high isolation between the primary and secondary edges, good linearity, wide frequency band, fast response, strong overload capacity, good temperature characteristics, stable performance, and no loss of the tested circuit
Advantages such as energy.
Product Usage: Used for measuring direct current, alternating current, pulse current, and any other waveform current and voltage.

Installing the Serial Adapter Cables

Two identical serial adapter cables are supplied. Each cable has a locking-type 8 pin Mini-DIN plug on one end and a DB-9 male connector on the other end. The Mini-DIN connector on each cable is inserted into the Mini-DIN receptacles marked PRT1 and PRT2 on the Base. To install the locking-type Mini-DIN connector, slide the spring-loaded sleeve back while inserting the plug into the receptacle on the Base, and then release the sleeve when fully seated. The locking mechanism prevents the cable from being removed during normal operation. To remove the cable, slide the sleeve back and remove the plug.

Wiring the Power Connections

External power is supplied to the Base on the 2 pin screw terminal block. The power supply can be either 24Vdc or 12Vdc, and should be located in close proximity of the base.

· Connect dc common to the COM terminal

· Connect +24V dc or +12V dc to the 24VDC terminal

In many applications, it is necessary to read or write floating-point data to the device. The sample program only provides an INT array for the ReadData and Write Data array (16-bit signed integer value). In order to read/write floating-point data to and from the device, you must add additional ladder logic to handle the conversion of the data to a REAL data type within the FLEX processor. This is very easy to accomplish. The following topics show how to read or write data to a device. These topics also show when to use the Float Flag and Float Start parameters within the module configuration.

For all applications, floating-point data can be read from a device without any changes to the Float Flag and Float Start parameters. You only need to configure these parameters to issue a Write command to a device that uses a single Modbus address, such as 47001, to represent a single floatingpoint value. The MVI94-MCM module can be used with many different processors. The following describes using the module with a ControlLogix processor.