Name: UT320 Digital Indicating Controller Stopgezet
Brand: Yokogawa
SKU: ut320-digital-indicating-controller

Are there independent PIDs for heating and cooling?

(ns-faq-green-9070-spec)

Yes, if it is a heating/cooling type.

Why is there no output on the cooling side?

(ns-faq-green-9068-spec)

Check whether you can output manually. If not, check wether OL (cooling output limiter)=100%.

I can't switch the SP.

(ns-faq-green-9053-spec)

Check whether you are trying to switch it via communication, or whether it is the zone PID.

I can't perform front panel communications with the UT320/321/350/351.

(ns-faq-green-9078-spec)

Check that the LL parameter is ON (LL=ON). If you can't perform front panel communications even if LL=ON, check whether you can communicate using the back panel terminal. If you can, it may be noise. Remove the communication lines. ...

There is no control output.

(ns-faq-green-9085-spec)

Check whether MAN operation (manual) is selected for the output.

When should I use sensor power supplies (affected models: certain Green series instruments)?

(ns-faq-green-9008-spec)

These are used when 2-wire transmitters are used in the field. They provide cost savings since they do not need to be purchased separately. 24 V (21.6–28.0 VDC, 30 mA MAX) sensor power supplies can be specified with the following models: UT551,...

A response time out occurs during communication on the UT320, UT321, UT350, or UT351.

(ns-faq-green-9101-soft)

Check whether the LL parameter on the controller is ON. If using RS-485 communication, turn it OFF. If it is already OFF, check the following. If front panel communication, ON If rear panel communication, OFF If it is already OFF, check the following...

UT320/UT321/UT350/UT351. On the UP350/UP351, there are parameters that I can't set.

(ns-faq-green-9098-soft)

In the controller specifications, communication and LOCK parameters cannot be set with the LL100/LL200.

I'm trying to do AUTO/MAN via communication by writing 0/1 to DO206, but it's not working.

(ns-faq-green-9051-spec)

The DO206 items are used when in cascade control mode. For other modes, use DO201.

I can't set R485 parameters for the UT320, UT321, UT350 and UT351 using the parameter setting tool.

(ns-faq-green-9103-soft)

We apologize for this. These parameters cannot be set using the tool (both terminal and front panel communications) due to the specifications of the controller main unit.

Output stops when the status is STOP.

(ns-faq-green-9031-spec)

When RET=1 or 2, the STOP has no effect.

What PID should be used for remote input?

(ns-faq-green-9025-spec)

With the UT300 series, only use 1PID. With UT400/500/700 models, the PID used just prior to switching to remote input is used. When using SP switching during remote input, only the PID switches.

What settings can I use to get control output that is proportional to the input?

(ns-faq-green-9045-setting)

Set the following: P=100, I=D=OFF, DR=DIR (direct action), MR=0, SP=0.

Can I perform CC-Link communication?

(ns-faq-green-9035-connect)

Yes, by using the UTAdvanced series.

The SP data written via communication is deleted when I turn the power ON/OFF.

(ns-faq-green-9038-spec)

DO215, used for communication, is not backed up.

Why don't PID items appear?

(ns-faq-green-9044-spec)

They don't appear with OT=3 ON/OFF control.

What are the PID switching methods?

(ns-faq-green-9041-spec)

There is a zone, contact, and parameter switching method.

How many PID groups can be used?

(ns-faq-green-9040-spec)

4 groups for the UT300 series, and 8 groups for the UT400/500/700 series.

With the LL100/LL200, are communications possible with the UT320/UT350/UP350 using a dedicated adapter?

(ns-faq-green-9116-1-spec)

Yes, if it is an enhanced model. If the product has been enhanced, an "E" appears on the front panel model name, as in "UT320E."

What models are supported by the LL100/LL200?

(ns-faq-green-9088-soft)

The UT300/400/500/700 series, and the UP350/351/550/750. However, the LL200 custom computation function is only compatible with the UT750/UP750.

Can I write the PV value via communication?

(ns-faq-green-9048-spec)

The PV value can be written by using the ladder sequence function of UTAdvanced series. However, when communication is interrupted, the PV value is retained.

When I set up alarm values the parameters are initialized and I can't enter the settings.

(ns-faq-green-9071-setting)

Set them in the order, Alarm type → Alarm setting values. They will also not be displayed if you select an alarm for which no value is set.

What is the difference between + and - of the dead zone?

(ns-faq-green-9067-spec)

If you set + dead zone in the settings, you can get an area where no outputs occur. If you set - dead zone, you can get an area where both outputs occur at the same time.

Is ON/OFF available with heating/cooling control?

(ns-faq-green-9066-setting)

Set both item P on the heating side and item Pc on the cooling side to 0.0.

When I change the SP and press SET/ENT, it restoring the original value.

(ns-faq-green-9052-spec)

Check that the operating parameters UPR and DNR are both OFF.

Are the alarm setting values and hysteresis settings set with a percentage?

(ns-faq-green-9072-spec)

The are set with a real number. For temperature, it is set in degrees Celsius.

What registers are accessible in UT link's Auto mode?

(ns-faq-green-9049-spec)

It depends on the model. The following lists the readable registers by model. UT100 series: D0001–D0009 UT300 series: D0001–D0008 UT400/UT500/UT700 series: D0001–D0025 UP350: D0001–D0008 UP550/UP750: D0001–D0025 ...

There is no indication on the display in the GREEN series.

(ns-faq-green-9082-spec)

Check whether the wiring to the power supply terminal is correct. If only the LCD on the UT/UP700 does not display, a custom computation may be set for no display. If the PV display is also blank, this may indicate product failure. Please contact you...

Please provide information about PCB usage. (GREEN series)

(ns-faq-green-9125-spec)

PCBs (polychlorinated biphenyl) were banned from manufacturing and imports in 1975. The GREEN series began to be manufactured in 1997, and do not include PCBs.

What is the write limit of 100,000 times?

(ns-faq-green-9046-spec)

This is a limit on the number of times you can write to the element used (EEP-ROM).

Is control output available on a failure?

(ns-faq-green-9084-spec)

The output is 0% if there is a hardware failure such as an internal microprocessor.

Are contacts still good during malfunction?

(ns-faq-green-9081-spec)

There are 2 types of output available, FAIL and "failure diagnosis."

What are energize/de-energize alarms?

(ns-faq-green-9076-term)

For energize alarms, ON contact results when an alarm occurs. For de-energize alarms, OFF contact results when an alarm occurs. Note that OFF contact also results when the power fails.

What should I do when b.out is displayed?

(ns-faq-green-9080-spec)

The sensor wire on the input side might be broken or disconnected.

Is there a function for resetting alarms?

(ns-faq-green-9075-spec)

No. When an alarm occurs, it automatically recovers if values enter the normal range.

Is there a MELSEC series with verified connectivity?

(ns-faq-green-9033-select)

Yes, MELSEC-A, MELSEC-Q, and MELSEC-FX.

I can't set contact input register DI/contact output register DO.

(ns-faq-green-9016-spec)

These cannot be set when in Custom Computation mode.

What are direct and reverse action?

(ns-faq-green-9017-term)

Generally, reverse action means heating control and direct action means cooling control. When output is reverse action, output is ON during PVSP.

Can I change setup parameters while the instrument is running?

(ns-faq-green-9015-spec)

Yes, but if you change some parameters, others will be initialized. We do not recommend that you make changes while in operation.

Auto-tuning parameters (AT) don't appear.

(ns-faq-green-9043-spec)

If the operation mode is STOP or MAN, they are not displayed.

Can I convert GREEN series (UT300/UT400/UT500/UP500) parameters for use with the UTAdvanced series?

(ns-faq-ut-2060-soft)

Yes, you can use the GREEN-UTAdvanced parameter data conversion tool (available as free download). Using the LL100/LL200 parameter setting tool, save the GREEN series parameters to a file, convert them using the conversion tool, then apply the settin...

Do Green series controllers support Ethernet?

(ns-faq-green-9009-connect)

Yes. This requires an RS-485/Ethernet converter such as VJET. The controller must also have a communication option. Some models can be connected directly with the UTAdvanced series.

There is no current input range.

(ns-faq-green-9018-spec)

Use a resistor to input current as voltage. A resistor is available: X010-250-2 (250 Ω).

How do I change the input type?

(ns-faq-green-9014-spec)

If you change the input type, parameters will be initialized. We do not recommend that you make changes while in operation.

What protocol is used when communicating with the Mitsubishi Electric's sequencer?

(ns-faq-green-9037-connect)

Ladder communication is used when communicating with the Computer link unit/Serial communication unit. Modbus/RTU is used for communication with the Modbus communication module.

Is there a function for determining the PID?

(ns-faq-green-9039-spec)

Yes, the Auto tuning function.

Do you offer programs for communication using calculator link units or serial communication units?

(ns-faq-green-9036-program)

Sample programs and dedicated communication materials are available for MELSEC-A/MELSEC-Q.

What items are accessible through a MELSEC connection?

(ns-faq-green-9034-spec)

Almost all items can be accessed, including PV reading, SP writing, and PID setting.

What is the maximum allowed load resistance?

(ns-faq-green-9032-spec)

600 Ω.

Are current control output and transmission output isolated?

(ns-faq-green-9028-spec)

No.

I used the parameter conversion tool to convert GREEN series data for the UTA series. I can’t add the CC-Link communication option code to the converted data.

(ns-faq-ut-2230-spec)

You can use the conversion tool. You don’t have to do anything after you create it. The steps are as follows: Perform the Green conversion using the conversion tool. Write the converted file to the UTA (with the CC-Link option) main unit. ...

I want to convert my old controller (GREEN series) parameter data for the UTAdvanced series. Is there a program for that?

(ns-faq-ut-2222-soft)

Yes. Software for converting your existing controller parameter data for use with the UTAdvanced series is available for download free of charge. GREEN to UTAdvanced Conversion Tool *Log-in Required ...

Can you give me details on PC link communication? (Affected products: UT100 series, Green series)

(ns-faq-green-9004-term)

This is a protocol for communication with general purpose PCs and graphic panels, and also the FA-M3: You can communicate with Yokogawa PLC range free controller UT link modules and serial communication modules. Also, you can easily connect with PLCs...

Can you give me details on Modbus communication? (Affected products: UT100 series, Green series)

(ns-faq-green-9006-term)

This is a protocol for communication with general purpose PCs and graphic panels. The UT130/UT150 can communicate with standard PCs. ...

Can you give me details on ladder communication? (Affected products: UT100 series, Green series)

(ns-faq-green-9005-term)

Ladder communication is a protocol for communication with PLCs. Aside from Yokogawa PLCs, you can communicate with Mitsubishi MELSEC-Q/A series calculator link units (using A1SJ71UC24-R4 or A1SJ71C24-R4). ...

Can you give me details on the "Super2" function? (Affected products:Green series)

(ns-faq-green-9003-term)

Even when you expand the applicable range of the PID constant, the process states fluctuate, or response is unstable and hunting occurs (control responses fluctuate), this function is effective for stabilizing control and suppressing hunting. Normall...

Can I use an RS-485 communication program written for the GREEN series (UT300/UT400/UT500/UP300/UP500/UM300) on a UT-Advanced series instrument?

(ns-faq-ut-2025-connect)

Program changes for reading PV and OUT, writing SP, and other basic parameters are not necessary. There are registers and relays that support the GREEN series. For details see the UTAdvanced series communication interface (RS-485, Ethernet) user'...

I'm replacing my GREEN series with the UTAdvanced series. Is there anything I need to be careful of in terms of wiring?

(ns-faq-ut-2108-connect)

The common for all GREEN series alarm relay outputs are shared. In the UTAdvanced series, each alarm relay output has its own common. If used the same way, use external wiring to connect common to common.

Can you give me details on the "Super" function? (Affected products:Green series)

(ns-faq-green-9002-term)

This is an overshoot suppression function that uses fuzzy logic. It constantly monitors deviation, and if it detects the possibility of an overshoot, it automatically changes the set point to a somewhat lower temp value (sub set point SSP). When y...

After changing the UT's SP values from the MELSEC via CC-Link, when I change the SP value on the UT main unit, I can't change to the same value as before from the MELSEC.

(ns-faq-ut-2026-connect)

As for individually writing parameters via CC-Link, changing OUT area values constitutes a write request. In your case, since the OUT area value hasn't changed from the previous value, the SP value is notoverwritten. As a fix, periodically copy t...

UT320 Digital Indicating Controller Stopgezet

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