Siemens SITRANS LUT400 Guida utente

Siemens Milltronics Process Instruments Inc.

1954 Technology Drive, P.O. Box 4225, Peterborough, ON Canada K9J 7B1

Tel: (705) 745-2431 Fax: (705) 741-0466 www.siemens-milltronics.com

Email: techpubs@siemens-milltronics.com

AG091712

SITRANS LUT400 Communications Options

Connecting the LUT400 to a control system and the available data

Objective: Summarize the data types available from the LUT 400

Seven methods to connect the LUT400 to a control system

While every effort was made to verify the following information, no warranty of accuracy or usability is expressed or implied.

Overview:

The SITRANS LUT400 comes with two ports:

a USB interface

a 4-20 mA output with HART communications

The USB interface connects a computer directly to the LUT400. The user programs the device via a web browser and also

downloads the data logs by treating the LUT400 as an external hard drive.

The HART interface presents a variety of methods for getting data out of the instrument. Listed below are seven ways to connect

the LUT400 to a control system.

1. 4-20 mA card

2. HART input card (Profibus DP connection)

3. Profibus PA gateway

4. Ethernet gateway

5. Wireless HART gateway

6. Foundation Fieldbus (FF) gateway

7. Modbus gateway

Topics:

Information types

Accuracy

Connection methods

APPLICATION GUIDE

LUT400 Communications Options

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APPLICATION GUIDE

Information from a LUT400:

The LUT400 can be configured to provide a primary variable (PV) which is one of the following measures:

Level

Space

Distance

Volume

Flow

Head

The LUT400 can also provide four dynamic variables from the same list. These variables are read from the device using

HART

universal command 3

which some HART interface cards do automatically. Other HART cards will also automatically read the

device variables using HART universal command 9. The 6 variables in the list above are the 6 device variables of the LUT400.

NOTES:

to define the dynamic variables and the required order, use HART common practice commands 50 and 51.

This chart presents other variables from the LUT400 for selected monitoring and the corresponding HART command required to

read the values.1

Variable HART Command

Daily total flow

Running (actual) total flow

Command 252: read totalizer parameters

Relay out (3)

Discrete In (2)

Command 216: read relay and DI states

Transducer temperature

Temperature sensor

Command 180: read temperature settings

Pumped hours Command 226: read relay pump

External totalizer Command 220: read external totalizer

High level alarm

Low level alarm

Command 198: read alarm parameters (transaction 1)

OCM max head

OCM max flow

OCM zero offset

OCM flow rate decimals

Command 248: read OCM flow information

Data logs can not be read through HART and are only available through the USB connection.

1For more detail on the HART commands, see lit18_sitrans_lut400.pdf available on Siemens service and support:

http://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objID=59217416&subtype=133300

LUT400 Communications Options

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APPLICATION GUIDE

Status Information:

HART provides several different status information indicators.2

Most of these gateways give the device variable status, so that an overall health of the variable is read:

2Please see Siemens application guide

Working with HART networks

(AG012712) for more details.

LUT400 Communications Options

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APPLICATION GUIDE

HART and Accuracy

The LUT400 has a stated measurement accuracy of +/- 1 mm plus the additional 0.17% of measured range. You will get this

accuracy when using HART, the display, and the data logs. However, the 4-20 mA channel has a transmit, transmission, and

receive error in addition to the measurement error, but we do not have data on the transmission and receive errors.

The transmission error depends on the wire used, length, and amount of noise. The receive error varies from card to card and is

typically not published.

The transmit error is known for the LUT400 and is under 0.005 mA with a worst-case error of 0.02 mA. At first glance, these

numbers do not appear to be significant. However, upon calculation, it becomes apparent that this small change adds

considerably to the overall error:

Consider a three-meter, high accuracy unit.

1. Over the three-meter range, a 0.005 mA error is 0.03125 % of 16 mA (range of 4 to 20 mA).

2. Multiply this by the measurement range of three meters equals an additional 0.9375 mm error – almost the same as the

measurement error.

3. Doing a similar calculation for the worst case error of 0.02 mA, you will get a transmit error of up to 5.8 mm.

Conclusion: Using 4-20 mA can result in your value being out between 1 mm and 6.8 mm.

LUT400 Communications Options

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APPLICATION GUIDE

For a 60-meter device, a similar calculation gives a typical error of 18.8 mm and worst-case error of 75 mm.

The measurement error is +/- 1 mm plus 0.17 % of the measurement which then equals up to 11mm at 60 meters.

Conclusion: using 4-20 mA can result in your value being out between 11 mm and 86 mm.

LUT400 Communications Options

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APPLICATION GUIDE

1. 4-20 mA card

Access to Process Variable: Only via 4-20 mA

Access to Secondary Variable: No

Access to variables from HART commands: No

Access to status information: No

Full accuracy: No

PDM access: Yes, locally via HART modem

PACTware access: Yes, locally via HART modem

AMS access: Yes, locally via HART modem

Benefits: Easy to use

Disadvantages:

Do not get any status information on the health of the device

No remote access to the field device

Can only view one variable

Less accuracy

Equipment Notes: Applies to any

manufacturer’s 4-20 mA input cards. Please

note that there are different levels of

accuracy and conversion speed in 4-20 mA

cards.

LUT400 Communications Options

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APPLICATION GUIDE

2. HART input card in an ET200M

Access to Process Variable: Yes

Access to Secondary Variable: Yes

Access to variables from HART commands: Yes

Access to status information: Yes

Full accuracy: Yes

PDM access: Yes, local or remote access possible

PACTware access: Yes, local or remote access possible

AMS access: Yes, but only via remote access at this point.

Benefits:

Full connection into TIA.

Provides status information to indicate the health of the device

Full and easy access via configuration software

Full accuracy

Disadvantages: Higher cost per point.

Equipment notes: The ET200M is a remote I/O

rack on Profibus DP and is made by Siemens.

It works with any Profibus DP master. For

this application, both the ET200M module

plus a HART input module for the ET200M are

required.

LUT400 Communications Options

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APPLICATION GUIDE

3. Profibus PA Gateway

Access to Process Variable: Yes

Access to Secondary Variable: Yes

Access to variables from HART commands: No

Access to status information: Yes

Full accuracy: Yes

PDM access: Local access via HART modem

PACTware access: Local access via HART modem

Benefits:

Connection onto PA network

Access to PV and status information

Full accuracy

Disadvantages:

Higher cost than 4-20 mA

No remote access via configuration software

Equipment notes: the key piece of equipment

for this application is the T500, a Profibus PA

to HART gateway made by Fieldbus

International AS (Fint). Order directly from

Fint at www.fint.no.

LUT400 Communications Options

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APPLICATION GUIDE

LUT400 Communications Options

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APPLICATION GUIDE

4. Ethernet Gateway

Access to Process Variable: Yes

Access to Secondary Variable: Yes

Access to variables from HART commands: Yes

Access to status information: Yes

Full accuracy: Yes

PDM access: Local and remote access

PACTware access: Local and remote access

AMS access: Local access

Benefits:

Easy to use HART data concentrator

Remote access via configuration software

Easy to connect to HMI via OPC

Full accuracy.

Disadvantages:

Higher cost than 4-20 mA.

Equipment notes: The Ethernet gateway is

made by Ifak. The head module is called

isNetLite and the HART modules are isNet

H@rt4 and isNet H@rt8. They can be

purchased directly from Ifak at www.ifak-

system.com.

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