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Digital Indicator with Alarms UM33A

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Model: UM331 Digital Indicator with Alarms

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,...

What is the delay timer in the alarm function?

(ns-faq-green-9074-term)

This is a function in which output occurs a specified time after an alarm set point is exceeded. If you clear the alarm point during operation of the timer, the timer is reset.

Can I perform CC-Link communication?

(ns-faq-green-9035-connect)

Yes, by using the UTAdvanced series.

IN is not displayed the first time I turn the power ON.

(ns-faq-green-9013-spec)

Once input is set, IN is not displayed when you turn the power ON.

Can you tell me about the 15 VDC transmitter power supply function?

(ns-faq-green-9030-spec)

This function supplies power to 2-wire transmitters. It differs depending on the specifications of the transmitter, but the input accepts 100 Ω resistors. 100 Ω resistor (model: X010-100-2, sold seperately)

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 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.

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.

Is there a MELSEC series with verified connectivity?

(ns-faq-green-9033-select)

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

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).

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 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'...

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.

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).

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.

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.

What is the maximum allowed load resistance?

(ns-faq-green-9032-spec)

600 Ω.

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.

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.

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.

Are contacts still good during malfunction?

(ns-faq-green-9081-spec)

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

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.

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 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.