Name: JUXTA M Series Computing Units
Brand: Yokogawa
SKU: juxta-m-series-computing-units

M Series computing units include a type that supports user-specified programs, and types that support analog memory, peak/bottom holders, moving averages, dead times, temperature/pressure compensation, and a wide range of other applications.

The M Series, plug-in style and microprocessor based computing unit receives DC current or DC voltage signals, applies various computing functions to them, and then converts them into isolated DC current or DC voltage signals. Three models of MXD, MXS, MXT covering 23 mathematical functions allow wide applications. Various parameters such as input range and computation programs can be set and modified using a PC (VJ77). Using industry standard pin configurations, anyone can upgrade to JUXTA performance by just plugging one in.

Universal Computing unit Free programmable type and fixed computation (Moving average, Dead time, 1st-order lag/lead, Linearizer, Ratio setting, etc.) type are available for almost every application.
Field configuration A field configuration of input range, computation program, etc. are possible from your PC (withVJ77 PC-based parameters setting tool).
Equipped with two isolated current outputs (MXS)
3 inputs for one computing unit (MXT) Temperature/pressure compensation for 3 inputs per one computing unit is realized by abundant variable parameters.
Analog output signal and integrated pulse signal are available (MXD).
Universal range of input and output signals
Plug-in type construction Easy for instrumentation planning, field wiring and maintenance because of its flexible insertion/extraction and ability to be pre-wired.
Power supply voltage is either 12 to 48 V DC or 85 to 264 V AC.

Construction	Plug-in type (Main unit with Socket)
Mounting Method:	Wall mounting or DIN-rail mounting
Connection Method:	M3.5 screw terminal
External Dimensions:	85×50×132 mm (H×W×D)
Power Requirements:	12 to 48 V DC or 85 to 264 V AC

Computing Units

Model	Product Name	Input Type	Output Type	Descriptions
MXD-A	Free program	DC Voltage or Current (1 point, free range)	DC Voltage or Current (Free range)	Setting of computing parameter, input range and zero/span adjustment, input/output value monitoring, etc. can be made through PC (with VJ77).
MXD-L	Analog memory	DC Voltage or Current (1 point, free range) and contact (1 point)
MXD-M	Peak holder
MXD-N	Bottom holder
MXD-P	Program setter	Contact (1 point)
MXD-Q	Integrated pulse output	DC Voltage or Current (1 point, free range)	DC Voltage or Current (Free range) and integrated pulse
MXS-A	Free program	DC Voltage or Current (1 point, free range)	DC Voltage or Current (Isolated 2 points, free range)	Setting of computing parameter, input range and zero/span adjustment, input/output value monitoring, etc. can be made through PC (with VJ77).
MXS-B	Moving average
MXS-C	Dead time
MXS-D	First-order lag
MXS-E	First-order lead
MXS-F	Velocity limiter
MXS-G	Limiter
MXS-H	Velocity computation
MXS-J	Linearizer
MXS-K	Ratio setter
MXT-A	Free program	DC Voltage or Current (3 points, free range)	DC Voltage or Current (Free range)	Setting of computing parameter, input range and zero/span adjustment, input/output value monitoring, etc. can be made through PC (with VJ77).
MXT-R	Temperature / pressure compensation
MXT-S	Adder/subtracter
MXT-T	Multiplier/Divider
MXT-U	Square root extractor
MXT-V	High Selector
MXT-W	Low Selector

Application Note

Measurement of Discharge from Triangular and Rectangular Weirs and Other Open Channels

Application Note

Measuring Rain by Using a Signal Conditioner (Computing Unit)

Application Note

Adding Quantities of Flow Using a Signal Conditioner (Computation Unit)

What models of computing unit should I choose based on differences in the flow detection methods (differential pressure, vortex type)?

(ns-faq-juxta-11018-select)

Differential pressure: choose the MXT-R or WTXx-R computing unit. Vortex: choose the MXT-T or WXTx-T computing unit.

Do any models support ASTEM correction?

(ns-faq-juxta-11026-select)

None support it completely, but if you can identify the fuel type you can use an MTX-A user program. When changing the type, change the correction curve.

What is the model of the JUXTA M series terminal block (socket)?

(ns-faq-juxta-11029-select)

The model numbers are as follows. 8-pin: A1653MR 11-pin: 1654MR 15-pin: A1681MR (Please consult with your dealer at the time of purchase.)

Can I change the MVHK, MVRK, and MVTK input ranges?

(ns-faq-juxta-11042-spec)

Yes, with front panel keys.

Can I replace MA1 style A with style C?

(ns-faq-juxta-11044-spec)

Yes. We have improved functions such as raising the withstand voltage, adding a power supply indicator, and reducing the power consumption.

I bought the MH5 but can I change output to reverse output?

(ns-faq-juxta-11048-setting)

Yes, with a handy terminal or VJ77. Under D:SET, change D49:OUT1DR = DIRECT to REVERSE.

I can't change the input type with a digital alarm setting device (MVHK, MVRK, and MVTK).

(ns-faq-juxta-11062-setting)

Check whether the key lock is engaged. If LOC = 1 or 2, set LOC = 0 with the SET/ENTER key, then enter setup parameters while LOC = -1.

I can't determine the gain and bias used for the MXT-R temperature/pressure compensation formula. Where are the reference pressure and temperature in the specifications?

(ns-faq-juxta-11064-spec)

Usually these are in the orifice specifications. Depending on the product, it may be listed with the normal operating pressure and temperature.

I'm updating the MA1W to MA5D-12xxx. If I reuse my existing MA1W socket for the MA5D-12, will the terminal arrangement still be correct?

(ns-faq-juxta-11069-spec)

Not necessarily. The socket itself can be reused, but the terminal arrangement may differ depending on the specifications. Check the switch on the back of the MA1W to determine whether power is supplied to the transmitter. If the switch for supply of...

With the UZ007 control signal conditioner, if the switching circuit drive power is OFF, what happens to the switching operation?

(ns-faq-juxta-11070-spec)

It holds the switching side immediately before the power went OFF.

Which screws are used for "the ML2 RS232C connector" inch screws or metric screw threads?

(ns-faq-juxta-11072-spec)

Inch screws.

For the ML2 Converter (Plug-in type), what is the maximum number of units that can be connected via RS485 communication?

(ns-faq-juxta-11074-spec)

Maximum of 31 units.

Is there an isolator with a breakpoint linearization (breakpoint setting) approximation function?

(ns-faq-juxta-11075-select)

Yes, there is the MH5 with 1 output and the MH5D with 2 outputs.

What cable should I use to connect the M series *A and the JHT200?

(ns-faq-juxta-11076-connect)

Use a communication cable with a 3-pin connector (F9182ED).

What is the leakage current when applying 100 VAC to the UZ011 SSR output?

(ns-faq-juxta-11077-spec)

4 mA or less.

Can I change the burnout operation?

(ns-faq-juxta-11001-spec)

This is possible if it is a microprocessor type converter. You will need a handy terminal to make the change. (VJR6, VJT6, VJS2, MR6, MT6, MS2, and others cannot be changed.)

How is a handy terminal (JHT200) connected to a conditioner that allows range changes?

(ns-faq-juxta-11002-setting)

F and W series: dedicated 3-pin cable D series: dedicated 5-pin cable VJ, J, and M series computation unit: 5-pin cable + modular conversion (E9786WH, sold separately).

Can I change settings from a BT200 (BRAIN terminal)?

(ns-faq-juxta-11003-spec)

If it is a model that allows range changes, it is possible just like from a JHT200. However, the type of cable is different from the one that comes standard, so you will need to purchase another cable. 3-pin cable: model F9182ED 5-pin cable: model F9...

Can I change the range on the MQ0?

(ns-faq-juxta-11004-spec)

No, you can't change the range after purchase. The compact VJQ7 model does allow you to change ranges, but this requires a setting tool that is sold separately.

How do I change settings?

(ns-faq-juxta-11006-setting)

Using the following settings tool, you can change the settings listed in the user's manual that came with the conditioner. Handy Terminals JHT-100 and JHT-200 BRAIN terminal BT200 (requires cable, sold separately) VJ77 Parameter Setting Tool...

What are the merits of plugin conditioners?

(ns-faq-juxta-11007-select)

They have the following advantages: Because you can separate the conditioner from the socket, panel work can proceed even without the conditioner. You can remove or replace the conditioner simply by plugging a new one in, so maintenance is easy. ...

How much resistance is there for current input?

(ns-faq-juxta-11010-spec)

The resistance is 250 Ω (4–20 mADC). However some computing units also have 100 Ω input.

What is the internal load resistance of pulse input?

(ns-faq-juxta-11011-spec)

You specify it for current pulse input. The resistance you specify depends on the specifications of the transmitter (mainly the rated current of the open collector). The internal load resistances are 200 Ω, 500 Ω, and 1 kΩ, and 0.5 ...

How do I determine the internal load resistance?

(ns-faq-juxta-11012-spec)

For example, if the specification of the open collector on the output side is 30 V/30 mA, use an internal load resistance of 1 kΩ (with a 24 V transmitter power supply). This results in a 0/24 mA current pulse.

There are Pt100 Ω standards of IPTS-68, ITS-90, and JPt100 Ω, but what is the difference between them?

(ns-faq-juxta-11013-other)

IPTS-68: This is an international standard from 1968 where R100/R0=1.3850 that was used by the JIS from 1989 to 1997, but currently it is not in use. ITS90: An international standard from 1990 where R100/R0=1.3851, and used by the JIS from 1997 to th...

How many instruments can be connected to a voltage output terminal (1–5 VDC)?

(ns-faq-juxta-11014-spec)

The input impedance of typical voltage input type instruments is 1 MΩ. By contrast, the allowable load impedance for voltage output is 2 kΩ or more, therefore the maximum number of units that can be connected is 500.

How many instruments can be connected to a current output terminal (4–20 mADC)?

(ns-faq-juxta-11015-spec)

The input impedance of typical current input type instruments is 250 MΩ. By contrast, the allowable load impedance for current output is 750 kΩ or more, therefore the maximum number of units that can be connected is 3.

What frequency setting should I use on an analog pulse converter when I want to output an integral pulse at 0.01㎥/P by using a 100㎥/H flowmeter?

(ns-faq-juxta-11016-spec)

100 × 1000/10/H = 10000/3600 Hz = 2.778 Hz (4 significant digits).

What does response speed **ms(10-90%) mean?

(ns-faq-juxta-11019-other)

It means the time until the output reaches 63% when input is applied in 10 Ω 90% steps.

There may be a 63% or 90% response depending on the manufacturer, but how should I compare these?

(ns-faq-juxta-11020-other)

A 90% response time is equivalent to 2.3 times the duration of a 63% response time.

What does "time constant" mean?

(ns-faq-juxta-11021-term)

In the case of conditioners, time constant reflects the response speed. In terms of a transfer function, it is expressed as OUT=INΩ(1-e EXP(-t/T)). OUT: output, IN: input, e: natural log, T: time constant, t: elapsed time When the elapsed time...

When ordering slide resistor conditioners, on models with total resistance, zero, and span resistance, what does total resistance mean?

(ns-faq-juxta-11022-other)

The total resistance ≥ zero side resistance + span resistance.

What is the output on burnout?

(ns-faq-juxta-11023-spec)

When UP, 106% of the output range or more; when DOWN, -6% or less.

What happens on a "burnout OFF"?

(ns-faq-juxta-11024-spec)

When input is interrupted it reaches ±OVER, but which of these is uncertain.

About how many computations can be included?

(ns-faq-juxta-11027-spec)

The F series has 30 steps. The W series has 40 steps. The M/VJ series has 59 steps.

What are the computation intervals of computing units?

(ns-faq-juxta-11028-spec)

On the M series you can select 50, 100, or 200 ms. On the F, W, and VJ series you can select 100 or 200 ms. (The VJXS can support 50 ms.)

Is an externally attached resistance for current input included?

(ns-faq-juxta-11033-select)

It is with plug-in types. It is also sold separately.

How can I suppress ripple noise on the instrument's input signal?

(ns-faq-juxta-11035-spec)

Using a first-order lag or moving average computing unit helps suppress noise. You can use the following for this: M series plug-in type signal conditioners, VJ series compact plug-in type units, or F/W series front panel terminal type computing unit...

Are there any models that allow me to set up an upper or lower limit limiter on the instrument's input signal?

(ns-faq-juxta-11036-select)

You can do this with a limiter or broken-line approximation function. You can use the following for this: M series plug-in type signal conditioners, VJ series compact plug-in type units, or F/W series front panel terminal type computing units. The br...

Can I attach the VJ and M series horizontally?

(ns-faq-juxta-11037-other)

As the orientation affects heat dissemination, it cannot be horizontal.

Does the JUXTA VJ series support CCC and GB standards? Can it be used in China?

(ns-faq-juxta-11038-other)

JUXTA VJ series is not a CCC standard scope. Some models of the VJ series have acquired GB standard and can be used in China. Please contact us for applicable models. ...

I purchased an isolator with a 4-20 mA current input specification. Can I use it with voltages of 1-5 VDC?

(ns-faq-juxta-11049-connect)

Yes. Wire it without using the included resistor.

With a 2 output type signal conditioner, when not using a current output terminal, how should I handle the terminal processing?

(ns-faq-juxta-11052-connect)

Short with a 250 Ω resistor (rated power of 0.25 W or more). If you don't have a resistor, a simple short is fine.

There's no output with an isolator. What should I do?

(ns-faq-juxta-11055-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. Check the polarity of the input wiring. Use a tester to measure the input terminal voltage. For current input specifications, confirm that the acces...

There's no output with a distributor. What should I do?

(ns-faq-juxta-11056-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. Check the polarity of the input wiring. Measure the voltage between the input terminal (-) and COM. The normal range is 1–5 VDC. Measure the v...

There's no output with a thermocouple temperature converter. What should I do?

(ns-faq-juxta-11057-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. Confirm that the accessory RJC sensor is connected to the input terminal. Short the input terminals, then confirm that the output is equivalent to th...

There's no output with an RTD temperature converter. What should I do?

(ns-faq-juxta-11058-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. For Pt100 input specifications, connect a 100 Ω resistance between input terminals A and B, short the B terminals, then confirm that the output ...

There's no output with a pulse signal repeater and pulse rate converter. What should I do?

(ns-faq-juxta-11059-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. Check the polarity of the input wiring. Check the pulse specifications of the other instruments. For voltage pulse, open collector, and non-voltage ...

There's no output with an analog/pulse converter. What should I do?

(ns-faq-juxta-11060-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. Check the polarity (+), (-) of the input wiring. Use a tester to measure the input terminal voltage. For current input specifications (applies to the...

There is no output with a pulse/analog converter. What should I do?

(ns-faq-juxta-11061-connect)

Check the power supply wiring. Check whether the power supply voltage meets the specifications. Check the polarity of the input wiring. Check the pulse specifications of the other instrument. For voltage pulse, open collector, and non-voltage c...