• Figure 1. M2MST, M2MNV External Appearance

  Parameter Generator (model: M2MST)
• Analog Switching Module (model: M2MNV)

M-System’s M2 (Mini-M) Series Signal Transmitters are designed to accept a large range of process signal inputs and provide standard and non-standard DC output. The M2 uses a plug-in socket base for quick installation or replacement of modules without disturbing wiring.

The M2MST (see Figure 1), with Isolation (dielectric strength) of 2000V AC @1 minute (output to power to ground), provides a constant DC signal for a setpoint and is adjusted by pressing the UP/DOWN control switch. The setpoint adjustment is easily accessed by opening the front digital display (Red LED) and the polarity indicator (Red/Green dual color LED, Red with a positive set value; Green with a negative set value). The setpoint is adjustable from –10.0% to +105% (0.1% increments, 1% increments over 100%).

Figure 2. M2MST Front View

For example, the output of M2MST is set at +65.0% when polarity indicator is lit Red and digital display is showing 65.0. To prevent operators from accidentally changing the setpoint by touching the display selector, it can be set to the downside, or OFF position, which disables the setting function and the digital display is turned off. It also has a power saving mode, which enables indicators to turn off when the switches are left untouched for 1 minute at the setting mode.

The M2MST output signal is selectable when ordering from Table 1.

The M2MNV switches between two analog signal channels and provides an output.

The input signal is selectable from three types. When selecting the input code 1, current signal (no receiving resistor), both A1 and A2 lines have Photo MOS relays which functions to short a side of the unswitched signal and prevent it from opening. It also prevents A1 and A2 lines from being open when the power input is OFF.
The switching control is selectable from the following two types.

Figure 3. M2MNV Schematic Circuitry & Connection Diagram

INTERLOCKING SWITCHING CONTROL
(single-pole contact)
Single contacts are used to switch from Signal Channel 1 (A1-B1) to Signal Channel 2 (A2-B1) and vice versa.

Table 3. Switching Status

Current Signal (no receiving resistor) Current Signal (receiving resistor 50Ω) Voltage Signal Power : OFF Switching command : OFF (open) Power : ON Switching command : OFF (open) Power : ON Switching command : ON (short)   Transition (ON to OFF, OFF to ON) Status Current Signal (no receiving resistor) Current Signal (receiving resistor 50Ω) Voltage Signal Power : ON Switching command : OFF to ON or Power : ON Switching command : ON to OFF When the switching command contact is switched from OFF to ON or from ON to OFF, the signal channel is switched only after all photo MOS relays turn on (closed). When the switching command contact is switched from OFF to ON or from ON to OFF, the signal channel is switched only after all photo MOS relays turn off (open).

*1. Resistor is provided only for the input code 2: Current signal (receiving resistor 50Ω).

INDEPENDENT SWITCHING CONTROL
(double-pole contact)
Double contacts are used to independently switch Signal Channel 1 (A1-B1) and Signal Channel 2 (A2-B1).

Figure 1. External Appearance and Dimensions of the 54U (3-phase/4-wire Model)

M-System’s model 54U is a panel mount 110mm-square (ANSI 4-inch round form size) Multi Power Monitor. One model can be used for single-phase/2-wire and 3-wire, three-phase/3-wire and 4-wire systems.

Key Functions and Features
(1) Measurement Variables
The 54U series’ terminal connection example shown in Figure 2 is for three-phase/4-wire system. Front and rear views are shown in Figure 3. Users can easily choose and program major variables from current, voltage, active, reactive, and apparent power, power factor, frequency, active and reactive energy, higher harmonics^*1; and voltage phase difference. These measured variables are included in Table 1.

System / Application Terminal Three-phase / 4-wire, balanced load Three-phase / 4-wire, unbalanced load

Figure 2. Connection Diagram of the 54U (3-phase/4-wire Model)

In addition to the variables listed above, users can configure this advanced multi power monitor to measure and display the necessary measurements from a total of more than 450 possibilities, including tidal operations^*2, four-quadrant operations^*3, maximum value, minimum value, power demand, and count time.

(2) Open Collector Outputs
Open collector outputs can be set to generate either pulse or alarm output during energy measurement. Output options are selectable with 1 open collector output, 1 contact input, or 2 open collector outputs. (With this particular configuration, the 54U does not provide contact input.) The device also includes an output simulation function that makes it easy for the user to check connections at system startup.

(3) Contact Signal Input
Uses of contact signal input include demand value updating and energy reset trigger signals. Modbus communications may also be used to transmit on/off information along with measurement data to enable the monitoring of contact status.

(4) Modbus Communications and Analog Output
Users can select between Modbus communications and analog output. Modbus communication functionality provides the user with the ability to transmit measurement values for all parameters so that the necessary power data can be sent to upstream devices for collection and analysis. Communication functionality can be used to configure such aspects of device operation as display components and alarm values, and Modbus functionality can also be utilized with the 54U’s configuration software.

There are 4 analog outputs available and a measurement variable can be assigned to each. The 54U also provides a loop test function for setting output to a user-specified value.

(5) Front Display
The 54U’s front display uses an exceptionally well-designed LCD with a 1-line bar graph and 3 digital display lines. The bottom line incorporates an information function that displays an integrated value for measurements during normal operation and notifies the operator with flashing descriptive text in the event of an alarm.

The bar graph displays a user-specified measurement variable in the context of minimum and maximum value markers that can be set as desired. Since the alarm range is simultaneously displayed on the bar graph, both the measured value and alarm range can be clearly and accurately ascertained with a glance by the operator.

In addition, a home location display function reverts the display to a preset configuration when the unit has not been operated for a predetermined length of time.

Figure 3. 54U Panel Diagram

Figure 4. Configuration Using Infrared Communications   Figure 5. Example of 53UCFG Measured Value Display Screen

(6) Infrared Communications and Configurator
The 54U is compatible with an infrared communication adapter (model: COP-IRU) that allows various settings to be configured without the need to connect the 54U to a computer (see Figure 4).

The configuration software (model: 53UCFG; see Figure 5) can be downloaded from M-System’s website (https://www.m-system.co.jp/). This software’s functionality includes the ability to modify, download and upload parameters for the 53U and 54U Multi Power Monitors; manage parameter files; and compare edited and device parameters. Although it is possible to configure the same settings from the device’s front panel, the 53UCFG software simplifies the process.

*1: Higher harmonics up to the 31st order can be measured for current and voltage.
*2: Outgoing and incoming operations.
*3: Outgoing lead/lag and incoming lead/lag operations.

M-System’s R7FN Series Remote I/O modules directly interface with Pro-face^® Graphic Operator Interface via FLEX NETWORK.

Palm-top size compact modules can handle sixteen discrete signals. Eight-point relay output module is also available.

These modules are designed to replace discontinued Pro-face^® FLEX NETWORK slave modules (See the table below) with minimum differences in hardware. Furthermore, they can be identified with the discontinued model numbers by the Graphic Operator Interface master, thus simplifying software programming even when you have added the R7FN modules to an existing system.

1500 Vac isolation is maintained between I/O, network and power input.

Analog I/O modules will be also available in the future. For updated information, please contact M-System sales/customer support at info@m-system.co.jp.

Pro-face^® is a registered trademark of Digital Electronics Corporation in Japan, U.S.A., Canada, Europe and other areas and countries.

Product Bulletins
A4:	Letter:

MODEL SELECTIONS

M-System R7FN Series FUNCTION MODEL Discrete input, PNP/NPN, 16 points R7FN-DA16 NPN transistor output, 16 points R7FN-DC16A PNP transistor output, 16 points R7FN-DC16B Discrete input, PNP, 8 points / NPN transistor output, 8 points R7FN-DAC16A Discrete input, NPN, 8 points / PNP transistor output, 8 points R7FN-DAC16B Relay contact output, 8 points R7FN-DC8C Pro-face Discontinued Products FUNCTION MODEL 16-point input, sink/source type FN-X16TS41 16-point output, sink transistor FN-Y16SK41 16-point output, source transistor FN-Y16SC41 8-point input, sink/source type / 8-point output, sink transistor FN-XY08TS41 8-point relay output FN-Y08RL41

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The R3 Series Remote I/O has been tested and verified for use in temperature monitoring/control system (T/C, RTD, DC current/voltage, Di) in the refining process, where an induction heating/melting furnace is used. The monitoring/control system by Siemens PLC had been originally planned with Siemens I/O, but the R3 Series Remote I/O proved better performance in the high voltage, high frequency environment generated by induction coils.

‘High Voltage, High Frequency Environment’ is a keyword to success for M-System signal conditioners and remote I/Os. Thanks to their excellent isolation capability, they have been widely used in similar applications using induction heating/melting equipment, for example, thermal treatment process in steel mills, and vacuum sputtering machines in semiconductor manufacturing plants.