West Control Solutions UTH 2 User manual

Brand: West Control Solutions

Model: UTH 2

Type: User manual

9499-040-68811 1

VARIO UTH 2

02/2003

User Manual

This data sheet is only valid in

association with the documents of the

used fieldbus coupler

Function

With this terminal you can measure signals from

standard thermocouples.

13 different thermocouple types (according to

DIN EN 60584-1 and DIN 43710) and a linear

voltage input of - 15 mV to +85 mV are

supported.

Features

– Two differential inputs for thermocouples or

linear voltage; one input for an external cold

junction PT 1000 or Ni 1000

– Configuration of the channels via fielbus

– Internal detection of the cold junction

temperature (can be configured)

– Absolute or differential temperature

measurement (can be configured)

– PT 1000 sensor close to the connection

terminals of the thermocouple inputs for the

internal detection of the cold junction

temperature

– Measured values can be represented in

three different formats

Figure 1 VARIO UTH 2 terminal with the

connector plugged in

All modules will be delivered including

connectors and labeling fields

5 7 2 2 A 0 1 3

5 7 2 2 0 0 0 1

I/O Extension Module

With Two Analog Input Channels for

Measuring Temperature

VARIO UTH 2

29499-040-68811

Table of Contents

Function ........................................................................................................................................... 1

Installation Instruction ......................................................................................................................4

Internal Circuit Diagram ...................................................................................................................5

Electrical Isolation ............................................................................................................................ 6

Connection Notes ............................................................................................................................. 6

Connection Examples ...................................................................................................................... 7

Programming Data ...........................................................................................................................9

Process Data Words ........................................................................................................................9

Formats for Representing the Measured Values ...........................................................................14

Measuring Ranges ......................................................................................................................... 20

Tolerances ..................................................................................................................................... 22

Technical Data ...............................................................................................................................29

Ordering Data ................................................................................................................................. 32

VARIO UTH 2

9499-040-68811 3

Figure 2 VARIO UTH 2 terminal with the

appropriate connector

Local Diagnostic and Status Indicators

Terminal Assignment

2 U T H

1 2

1 . 1

1 . 2

1 . 3

1 . 4

2 . 1

2 . 2

2 . 3

2 . 4

5 7 2 2 1 0 0 2

Des. Color Meaning

DGreen Bus diagnostics

Terminal

Points

Signal Assignment

1.1, 2.1 Not used

1.2 TC+ Thermocouple

(plus input) channel 2

2.2 TC- Thermocouple

(minus input) channel 2

1.3 TC+ Thermocouple

(plus input) channel 1

2.3 TC- Thermocouple

(minus input) channel 1

1.4, 2.4 Shield Shield connection

(channels 1 and 2)

VARIO UTH 2

49499-040-68811

Installation Instruction

High current flowing through the voltage jumpers UM and US leads to a temperature rise of the voltage

jumpers and the inside of the terminal. Note the following instruction to keep the current flowing

through the voltage jumpers of the analog terminals as low as possible:

All of the analog terminals need a separate main circuit!

If this is not possible in your application and if you are using analog terminals in a main

circuit together with other terminals, make sure you are placing the analog terminals after

all the other terminals at the end of the main circuit.

Note with the VARIO UTH 2 terminal that any current flowing through the voltage jumpers

falsifies the temperature of the internal cold junction. Therefore, position this terminal after

all of the other terminals to keep the current flowing through all voltage jumpers as low as

possible.

VARIO UTH 2

9499-040-68811 5

Internal Circuit Diagram

Figure 3 Internal wiring of the terminal points

Key:

5 7 2 2 1 0 0 3

+ 2 4 V ( U M)

+ 2 4 V ( U S)

I N T E R B U S

O P C

E E P R O M

R E F

2 4 V

5 V

UL +

UA N A

UL -

M U X

µ P

INTERBUS protocol chip

Optocoupler

DC/DC converter with electrical

isolation

Microprocessor with multiplexer,

current source for the cold junction,

and analog/digital converter

Reference voltage

Electrically erasable

programmable read-only memory

Amplifier

Analog ground, electrically isolated

from ground of the voltage jumper

OPC

xxx

XXX

M U X

µ P

R E F

E E P R O M

VARIO UTH 2

69499-040-68811

Electrical Isolation

Figure 4 Electrical isolation of the function areas

Connection Notes

Connection of the Thermocouples

Always connect thermocouples using shielded, twisted-pair cables.

Use encapsulated thermocouples (ungrounded junction) only!

Connection of the Shield

The connection of the shield is shown in the examples (Figure 5 to Figure 7).

Connect the shield only at the the Inline terminal above the shield connector clamp. This

prevents the creation of PE loops that could occur if both ends of the shield are connected

to PE (protective earth ground). The clamp connects the shield directly to FE (functional

earth ground) on the terminal side. Additional wiring is not necessary.

Insulate the shield at the sensor.

5 7 2 2 A 0 0 7

A n a l o g i n p u t sF E p o t e n t i a l

E l e c t r i c a l i s o l a t i o n

b e t w e e n a r e a A a n d

a r e a B

ANA

( 2 4 V D C )

I N T E R B U S

l o c a l b u s ( I N )

I / O i n t e r f a c e

a n d

m i c r o p r o c e s s o r

B u s i n t e r f a c e

O P C

I N T E R B U S

l o c a l b u s ( O U T )

( 7 . 5 V D C )

ANA

( 2 4 V D C )

( 7 . 5 V D C )

2 4 V

5 V

VARIO UTH 2

9499-040-68811 7

Connection Examples

When connecting the shield at the terminal you must insulate the shield on the sensor side

(shown in Figure 5 and Figure 6 [gray area]).

Use a connector with shield connection when installing the sensors. Figure 5 and Figure 6

shows the connection schematically (without shield connector).

Absolute Temperature Measurement

Figure 5 Absolute temperature measurement

on two channels

With absolute temperature measurement the

measuring temperature of T1 or T2 is detected

through cold junction compensation (TCJ1,

TCJ2).

Differential Temperature Measurement

Figure 6 Differential temperature

measurement with

two thermocouples (K type)

Umeas = UT1 - UX1 + UX2 - UT2 = UT1 - UT2

If the two terminal points (A) have the same

temperature level the absolute values of UX1

and UX2 are identical. Both voltages cancel each

other out. What remains is the difference

between UT1 and UT2.

1 2

2 U T H

5 7 2 2 0 0 0 8

J t y p e

C u N i F E

T1K t y p e

N i N i C r

TC J 2

TC J 1

1 2

2 U T H

5 7 2 2 A 0 1 2

N i C r

N i

UT 2

UT 1

N i

C u

UX 1

UX 2

Um e a s

VARIO UTH 2

89499-040-68811

Extension of the Equalizing Conductor

When connecting the shield at a central ground position you must insulate the shield on

the opposite side (shown in Figure 7 [gray area]).

Use a connector with shield connection when installing the sensors. Figure 7 shows the

connection schematically (without shield connector).

Figure 7 Extension of the equalizing

conductor using thermal element

terminal blocks

1 2

2 U T H

5 7 2 2 1 0 1 0

C e n t r a l

grounding

point

P E T h e r m o -

c o u p l e

C h a n n e l 2

E q u a l i z i n g

conductor

M T K D t e r m i n a l

VARIO UTH 2

9499-040-68811 9

Programming Data

Process Data Words

Output Data Words for the Configuration of the Terminal (see page 10)

Assignment of the Terminal Points to the Input Data Word

ID code 7Fhex (127dec)

Length code 02hex

Process data channel 32 bits

Input address area 4 bytes

Output address area 4 bytes

Parameter channel

(PCP)

0 bytes

“Word-bit”

view

Word Word x

Bit 1514131211109 8 76543210

“Byte-bit”

view

Byte Byte 0 Byte 1

Bit 7654321 0 76543210

Channel 1 Assignment1000000 CJ Reso-

lution

Format Sensor type

Channel 2 Assignment1000000 CJ Reso-

lution

Format Sensor type

“Word-bit”

view

Word Word x

Bit 1514131211109876543210

“Byte-bit”

view

Byte Byte 0 Byte 1

Bit 7654321076543210

Channel 2 Signal 1514131211109876543210

Channel 1 Signal 1514131211109876543210

VARIO UTH 2

10 9499-040-68811

OUT Process Data Output Words

You can configure the channels of the terminal

with the two process data output words. The

following configurations are possible for every

channel independent of the other channel:

– Selection of a sensor type

– Setting the resolution

– Switchover of the formats of the measuring

value representation

– Selection of the cold junction

The configuration setting is not saved. It must be

transmitted in each fieldbus cycle.

After applying voltage (Power Up) to the Inline

station, the message “Measured value invalid”

(error code 8004hex) appears in the process

data input words.

After 1 s (maximum) the preset configuration is

accepted and the first measured value is

available. If you change the configuration the

corresponding channel is re-initialized. The

message “Measured value invalid” (error code

E8004hex) appears in the process data output

words for 100 ms (maximum).

Default:

Sensor type: TC type K

Resolution: 0.1°C (1µV)

Output format: Format 1

(IB standard)

Cold junction: Internal

VARIO UTH 2

9499-040-68811 11

Figure 8 Process data output words

Set all reserved bits to 0.

One process data output word is available for

the configuration of each channel.

You must set bit 15 of the corresponding output

word to 1 to configure the terminal. If bit 15 = 0

the preset configuration is active.

Bit 15:

Bit 8: Bit 7 and bit 6:

C h a n n e l 1

M S B L S B

01 4 1 3 1 2 1 1 1 0 9 8 7 6 5 4 3 2 1

C h a n n e l 2

5 7 2 2 A 0 0 6

F o r m a t S e n s o r t y p e

P r o c e s s d a t a w o r d 1 P r o c e s s d a t a w o r d 2

1 5

C o l d j u n c t i o n

C o n f i g u r a t i o n R e s o l u t i o nR e s e r v e d

Code Configuration

Dec. Bin.

00Default

1 1 Configuration data

Code Cold Junction Compensation

Dec. Bin.

00Internal

1 1 None

Code Resolution (refers to format 1

[IB standard])

Dec. Bin.

0 00 0.1°C (1 µV)

1 01 1°C (10 µV)

2100.1°F

3111°F

VARIO UTH 2

12 9499-040-68811

Bit 5 and bit 4:

Bit 3 to bit 0:

Use the IB standard format for the

representation of the measured

values of sensor type 14 (linear

voltage).

When selecting the cold junction

sensor type, the temperature of the

cold junction (terminal temperature) is

indicated in the input data word. The

configured channel is not evaluated in

the measuring cycle so that the

update time for the terminal is

reduced.

Code Format

Dec. Bin.

0 00 Format 1: IB standard

15 bits + sign bit with extended

diagnostics

1 01 Format 2:

12 bits + sign bit + 3 diagnostic

bits

2 10 Format 3:

15 bits + sign bit

3 11 Reserved

Code Sensor Type Code Sensor Type

Dec. Bin. Dec. Bin.

0 0000 TC type K 8 1000 TC type U

1 0001 TC type J 9 1001 TC type L

2 0010 TC type E 10 1010 TC type C

3 0011 TC type R 11 1011 TC type W

4 0100 TC type S 12 1100 TC type HK

5 0101 TC type T 13 1101 Cold Junction (CJ)

6 0110 TC type B

7 0111 TC type N 14 1110 U: voltage (-15 mV to +85 mV)

15 1111 Reserved

VARIO UTH 2

9499-040-68811 13

Process Data Input Words

The measured values are transmitted, per channel, through the process data input words to the

controller board or the computer.

Figure 9 Sequence of the process data input words and display of the bits of the first process data

word in different formats

The process data format 1 (IB standard) supports extended diagnostics.

The following error codes are possible:

SB Sign bit OC Open circuit

AV Analog value OR Over range

0 Reserved

Code (Hex) Error

8001 Over range

8002 Open circuit

8004 Measured value invalid/no valid measured value available

8008 Cold junction defective

8010 Configuration invalid

8040 Terminal defective

8080 Under range

C h a n n e l 1

M S B L S B

C h a n n e l 2

P r o c e s s d a t a w o r d 1 P r o c e s s d a t a w o r d 2

01 4 1 3 1 2 1 1 1 0 9 8 7 6 5 4 3 2 11 5

S B A V

01 4 1 3 1 2 1 1 1 0 9 8 7 6 5 4 3 2 11 5

O R

0O C

S B A V

F o r m a t 1

F o r m a t 3

F o r m a t :

5 7 2 2 A 0 0 9

F o r m a t 2

VARIO UTH 2

14 9499-040-68811

Formats for Representing the Measured Values

Format 1: IB Standard

The measured value is represented in bits 14 to 0. An additional bit (bit 15) is available as a sign bit.

This format supports extended diagnostics. Values > 8000hex indicate an error. The error codes are

listed on page 13.

Figure 10 Measuring value representation in format 1 (IB standard; 15 bits)

Typical Analog Values Depending on the Resolution

SB Sign bit AV Analog value

Sensor Type (Bit 3 to 0) TC and CJ Sensor (0 to 13) Linear Voltage (14)

Resolution (Bit 7 and 6) 00bin / 10bin 00bin

Process Datahex

(= Analog

Valuehex)

Analog Valuedec 0.1°C / 0.1°F

(°C) / (°F)

1 µV

(µV)

8002 Open circuit –

8001 Over range > 32512

2710 10000 1000.0 10000

000A 10 1.0 10

0001 1 0.1 1

0000 0 0 0

FFFF -1 -0.1 -1

FC18 -1000 -100.0 -1000

C568 -15000 – -15000

8080 Under range < -15000

01 4 1 3 1 2 1 1 1 0 9 8 7 6 5 4 3 2 1

5 5 6 4 1 0 0 8

1 5

S B A V

VARIO UTH 2

9499-040-68811 15

If the measured value is higher than the process data representation, the error code

“Overrange or Underrange” is indicated.

The error message “Open circuit” is only indicated in TC operating mode.

Sensor Type (Bit 3 to 0) TC and CJ Sensor (0 to 13) Linear Voltage (14)

Resolution (Bit 7 and 6) 01bin / 11bin 01bin

Process Datahex

(= Analog

Valuehex)

Analog Valuedec 1°C / 1°F

(°C) / (°F)

10 µV

(µV)

8002 Open circuit –

8001 Over range > 85000

2134 8500 – 85000

03E8 1000 1000 10000

0001 1 1 10

0000 0 0 0

FFFF -1 -1 -10

FF9C -100 -100 -1000

FA24 -1500 – -15000

8080 Under range < -15000

VARIO UTH 2

16 9499-040-68811

Format 2

The measured value is represented in bits 14 to 3. The remaining 4 bits are: sign bit and error bit.

Figure 11 Measured value representation in format 2 (12 bits)

SB Sign bit OC Open circuit

AV Analog value OR Over range

0 Reserved

01 4 1 3 1 2 1 1 1 0 9 8 7 6 5 4 3 2 1

5 5 2 0 0 0 6 0

1 5

O R

0O C

S B A V

VARIO UTH 2

9499-040-68811 17

Typical Analog Values Depending on the Resolution

If the measured value is higher than the representation area of the process data, bit 0 is

set to 1.

With an open circuit, bit 1 is set to 1.

Sensor Type (Bit 3 to 0) TC and CJ Sensor (0 to 13)

Resolution (Bit 7 and 6) 00bin / 10bin 01bin / 11bin

Process Datahex

(= Analog Valuehex)

Analog

Valuedec

0.1°C / 0.1°F

(°C) / (°F)

1°C / 1°F

(°C) / (°F)

xxxx xxxx xxxx xxx1bin Over range

(AV = positive final value from the table on page 21)

2710 10000 1000 –

03E8 1000 100 1000

0008 8 0.8 8

0000 0 0 0

FFF8 -8 -0.8 -8

FC18 -1000 -100 –

xxxx xxxx xxxx xxx1bin Under range

(AV = negative final value from the table on page 21)

xxxx xxxx xxxx xxx1bin Open circuit

(AV = negative final value from the table on page 21)

AV Analog value X Can have the values 0 or 1

VARIO UTH 2

18 9499-040-68811

Format 3

The measured value is represented in bits 14 to 0. An additional bit (bit 15) is available as a sign bit.

Figure 12 Measured value representation in format 3 (15 bits)

SB Sign bit AV Analog value

01 4 1 3 1 2 1 1 1 0 9 8 7 6 5 4 3 2 1

5 5 6 4 1 0 0 8

1 5

S B A V

VARIO UTH 2

9499-040-68811 19

Typical Analog Values Depending on the Resolution

* For the limit values refer to the table on page 21

Sensor Type (Bit 3 to 0) TC and CJ Sensor (0 to 13)

Resolution (Bit 7 and 6) 00bin / 10bin

Process Datahex

(= Analog Valuehex)

Analog Valuedec 0.1°C / 0.1°F

(°C) / (°F)

Upper limit value* +1 LSB Over range

7D00 32000 –

2710 10000 1000.0

000A 10 1

0001 1 0.1

0000 0 0

FFFF -1 -0.1

FC18 -1000 -100.0

B500 -19200 –

Lower limit value* -1 LSB Under range

Lower limit value* -2 LSB Open circuit

Sensor Type (Bit 3 to 0) TC and CJ Sensor (0 to 13)

Resolution (Bit 7 and 6) 01bin / 11bin

Process Datahex

(= Analog Valuehex)

Analog Valuedec 1°C / 1°F

(°C) / (°F)

Upper limit value* +1 LSB Over range

6400 25600 –

03E8 1000 1000

0001 1 1

0000 0 0

FFFF -1 -1

FF9C -100 -100

ED40 -4800 –

Lower limit value* -1 LSB Under range

Lower limit value* -2 LSB Open circuit

VARIO UTH 2

20 9499-040-68811

Measuring Ranges

Measuring Ranges Depending on the Resolution (Format 1 [IB Standard] and Format 3)

Measuring Ranges Depending on the Resolution (Format 2)

Temperature values can be converted from °C to °F with this formula:

With:

Resolution

(Bit 7 and 6)

Thermocouples Linear Voltage Sensor

00 -273°C to +3276.8°C

Resolution: 0.1°C

-15 mV to +32.7768 mV

Resolution: 1 µV

01 -273°C to +32768°C

Resolution: 1.0°C

-15 mV to +85 mV

Resolution: 10 µV

10 -459°F to +3276.8°F

Resolution: 0.1°F

11 -459°F to +32768°F

Resolution: 1.0°F

Resolution

(Bit 7 and 6)

Thermocouples

00 -272.8°C to +3276.0°C

Resolution: 0.8°C

01 -272°C to +32760°C

Resolution: 8°C

10 -459.2°F to +3276°F

Resolution: 0.8°F

11 -456°F to +32760°F

Resolution: 8°F

T [°F] Temperature in degrees Fahrenheit

T [°C] Temperature in degrees Celsius

T [ ° F ] = T [ ° C ] x + 3 2

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West Control Solutions UTH 2 User manual

Brand: West Control Solutions

Model: UTH 2

Type: User manual

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West Control Solutions UTH 2 User manual

West Control Solutions UTH 2 User manual

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