JP2002008176A - Field terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain information of field equipment installed at a place where people can not approach. SOLUTION: A field terminal 1 stored in a waterproof case 2 is provided between a plurality of transmission units and high-order equipment to switch and display the information of each transmission unit displayed in an LCD unit 3 by a switch 5 capable of inputting address of each installed transmission unit by an operation key 4 to switch the display of the information of each transmission unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field terminal, and more particularly, to an indicator such as a differential pressure transmitter, a pressure transmitter, a temperature transmitter, and a flow meter, and more particularly, to a position of an installed transmitter. The present invention relates to a field terminal capable of displaying a measurement value, an alarm, and the like, which are information of a transmitter.

[0002]

2. Description of the Related Art Differential pressure transmitters, pressure transmitters, temperature transmitters,
As a field device such as a flow meter, an LCD (indicating function) unit is widely used. The LCD has a function of displaying various measured values, alarms, and the like. The smart function is widespread in the above field devices. The smart function is a function for displaying various measured values, alarms, etc., various settings, and various adjustments.

[0003] In addition, field devices are often installed in a variety of installation locations and inaccessible places to humans.
This is the case, for example, in installations at high places using direct mount instrumentation. This LCD (instruction function) is used for checking the operation of the instrument at the time of patrol on site.

[0004]

SUMMARY OF THE INVENTION Conventional HHT, LC
D, the field terminal is the measured value (operation) of the transmitter,
You can see alarms, etc., but you cannot see past trend records. In addition, to check the measured values of the conventional transmitter and the history of alarms, use the DC installed in the instrument room.
It is necessary to look at the S or the recorder, and it is not possible to confirm the record while looking at the transmitter on site during the plant patrol.

[0005] In addition, a transmitter installed in a place where humans cannot approach cannot see the measured value (operation) and alarm of the instrument on the LCD. Conventionally, when the LCD unit cannot be visually checked directly, the measured value (operation) and alarm of the smart type transmitter have been confirmed using an HHT (handheld terminal) for the transmitter. However, there is a problem that the HHT must be carried around and the HHT cannot be used in rainy weather.

[0006] Therefore, the present invention provides a method for measuring a measured value (operation) of a transmitter installed in a place where humans cannot reach, and easily measuring a measured value of the transmitter without approaching the place, even if an alarm is issued.
The purpose is to be able to know the alarm.

[0007]

In order to achieve such an object, the invention according to claim 1 is connected to a transmitter installed in a field by a field bus and transmitted from the transmitter. A field terminal for transmitting information to a higher-level device, comprising: a means for inputting an address; and a means for displaying information on a transmitter to which the input address is assigned. A field terminal for displaying the information of the field terminal. By adopting such a structure, it is possible to obtain information on a transmitter installed in any place.

According to a second aspect of the present invention, there is provided a field terminal which has a waterproof function and is instrumented between a plurality of transmitters and a host device, and inputs an address of each installed transmitter. Operation keys, and a switch for enabling the display of information of each transmitter to be switched on the LCD unit, and display information of a plurality of transmitters regardless of the position of the installed transmitter. This is a field terminal having a function of performing the following.

By adopting such a structure, even if the field terminal is installed in a place where it is exposed to rain or the like, the field terminal is protected by the waterproof case having a waterproof function. It can be used. In addition, a plurality of transmissions are performed by inputting the address of the transmitter, which is information of a transmitter installed in a place where humans cannot approach, from an operation key of a field terminal, and switching the address by a changeover switch provided in the LCD unit. It becomes possible to know the information of the container easily.

[0010]

FIG. 1 is a perspective view showing a temperature transmitter disposed in a plant according to an embodiment of the present invention.

No. 1 to No. 7 are temperature transmitters in the plant. The temperature transmitters No. 1 to No. 7 are connected by a field bus, and information such as measured values (operations) and alarms are transmitted to the handheld PC 10 via the field terminal 1. The temperature transmitters No. 1 to No. 4 are installed at a high place where humans cannot approach, and have no indicator. No. 5 to No. 7 temperature transmitters are installed near the surface of the ground and have indicators.

The field terminal 1 is housed in a waterproof case 2 because it needs to be protected from rain or the like depending on a place where the field terminal 1 is installed. An LCD unit 3 is provided on the front surface of the field terminal 1, and can display information of measured values and alarms of each temperature transmitter (No. 1 to No. 7). Operation keys 4 are provided on the entire surface of the field terminal 1 for inputting addresses of the temperature transmitters (No. 1 to No. 7). In addition, each temperature transmitter (N
A changeover switch 5 for switching the display of the LDC unit 3 is provided for each of the addresses o.1 to No.7).

When it is desired to know the measurement values, alarms, etc. of the temperature transmitters No. 1 to No. 4,
Input the addresses of the temperature transmitters No. 1 to No. 4 from the operation keys 4 of the LCD unit, and operate the changeover switch 5 provided on the LCD unit to display the information such as the measured value and the alarm of each temperature transmitter. 3 can be displayed. Then, information is transferred from the field terminal 1 to a higher-level device such as the handheld PC 10, and the information can be confirmed by the handheld PC. As a result, it is possible to easily know the measured values and alarms of the No. 1 to No. 4 temperature transmitters installed at a high place where humans cannot approach.

Regarding the temperature transmitters No. 5 to No. 7 which are installed near the surface of the earth and have indicators, a human approaches and confirms information such as measured values and alarms of these temperature transmitters. It is possible to However, it is difficult to confirm the measured values of these temperature transmitters and the history of alarms simply by attaching such indicators. This can be achieved by inputting the address of each temperature transmitter from the operation keys to appropriately know information such as measured values and alarms of each temperature transmitter.

Although the present embodiment has been described using a smart type transmitter, the same operation can be performed with devices other than the smart type transmitter. In that case, each transmitter (No. 1
-No. 7) can be dealt with by providing wiring and switches to switch the display.

[0016]

According to the first and second aspects of the present invention,
By inputting the address of each transmitter to the field terminal, it is possible to easily obtain information such as a measured value and an alarm of each transmitter.

As described above, information such as a measured value of a transmitter and an alarm can be known at any time by inputting an address using the operation keys. As a result, continuous information (measurement values,
The alarm can be known at the site (where the handheld PC is located) in the plant without the person who patrols the plant approaching the place where the transmitter is installed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a temperature transmitter disposed in a plant according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the entire field terminal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Field terminal 2 Waterproof case 3 LCD unit 4 Operation key 5 Changeover switch 10 Handheld PC

Claims (2)

[Claims] 1. A field terminal which is connected to a transmitter installed in a field by a field bus and sends information transmitted from the transmitter to a host device, means for inputting an address, and the input address is allocated. Means for displaying the information of the transmitter provided, and displaying the information of the transmitter regardless of the position of the installed transmitter. 2. An operation key having a waterproof function and being instrumented between a plurality of transmitters and a host device, capable of inputting an address of each installed transmitter. And a switch for enabling the LCD unit to switch the display of information of each transmitter, and has a function of displaying information of a plurality of transmitters regardless of the position of the installed transmitter. And a field terminal.