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 Handy Terminal (JHT200) or 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) or using our Handy Terminal (JHT200).
  • 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 Handy Terminal (JHT200) or 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 Handy Terminal (JHT200) or 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 Handy Terminal (JHT200) or 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

【Support Information】List of RoHS

This is a list of recorder and controller products that support the RoHS (2011/65/EU) directive.

Overview:

Weir-type flow volume calculation using the M series Free Programmable MXS (or VJXS) Computing Units

Overview:

This describes a rainfall pulse integration that uses an M series computing unit MXT (XJJM.511) free program. The XJJM.511 hardware is a computing unit with 3 isolated inputs and 1 output. There is 1 analog input, 2 digital inputs, and 1 analog output. The rain gauge's unit rainfall pulses are integrated and sent to the analog output (e.g. 1–5 VDC). The output rainfall integral value is 0% for a count of 0, and 100% for a count of 100. When the rainfall integral value reaches 100%, 100% is output for 1 second, and then the integral value returns to 0%. The maximum value of the rain integration can be changed on the JHT200 or other device.

Overview:

This introduces use of a contact input multiplication/addition computing unit that employs a user program of the MXT computing unit (XJJM.507) on fluid mixture and other calculated measurement outputs from flow meters. The figure below shows examples of connecting various field instruments to an upstream system.

Is there an isolator with a linearizer?
(ns-faq-juxta-11075-select)
Yes, there is the MH5 with 1 output and the MH5D with 2 outputs.
It holds the switching side immediately before the power went OFF.
Use a communication cable with a 3-pin connector (F9182ED).
Use a communication cable with a 3-pin connector (F9182ED).
Differential pressure: choose the MXT-R or WTXx-R computing unit. Vortex: choose the MXT-T or WXTx-T computing unit.
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...
Is there an isolator with a linearizer?
(ns-faq-juxta-11075-select)
Yes, there is the MH5 with 1 output and the MH5D with 2 outputs.
It is A1654MR. (Please consult with your dealer at the time of purchase.)
It is A1653MR. (Please consult with your dealer at the time of purchase.)
Usually these are in the orifice specifications. Depending on the product, it may be listed with the normal operating pressure and temperature.
Yes, with front panel keys.
It is A1681MR. (Please consult with your dealer at the time of purchase.)
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.
Can I replace MA1 style A with style B?
(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.
Yes, with a handy terminal or VJ77. Under D:SET, change D49:OUT1DR = DIRECT to REVERSE.
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.
Yes. Wire it without using the included resistor.
Yes. Wire it without using the included resistor.
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.
Does JUXTA support the CCC standard?
(ns-faq-juxta-11038-other)
JUXTA does not support the CCC standard, but it can be used in China.
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...
  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 t...
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...
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...
As the orientation affects heat dissemination, it cannot be horizontal.
As the orientation affects heat dissemination, it cannot be horizontal.
Resistors come with isolators that have terminal block format current input specifications. Please attach it to the input terminals before use.
Yes. To satisfy the performance specifications, you should power the unit for 10–15 minutes.
Please provide information about PCB usage.
(ns-faq-juxta-11068-other)
PCBs were banned from manufacturing and imports in 1975. JUXTA was first released in 1987, therefore they should not include PCBs.
It is with plug-in types. It is also sold separately.
  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-v...
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 VJ and ...
  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 equivale...
  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...
  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-...
  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. Measu...
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 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. No n...
The resistance is 250 Ω (4–20 mADC). However some computing units also have 100 Ω input.
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 ...
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.
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...
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.
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.)
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).
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...
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...
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.
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.
The F series has 30 steps. The W series has 40 steps. The M/VJ series has 59 steps.
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...
A 90% response time is equivalent to 2.3 times the duration of a 63% response time.
The open collector needs a power supply. Use one within the maximum allowable load. ...
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.
What are the computation intervals?
(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.)

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