BECKHOFF KL3311 User Manual

Operating instructions for

KL3311, KL3312, KL3314 and
KL3302

Single-, Two- and Four-Channel Analog Input Terminals
for Thermocouples

Version: 3.4
Date: 2008-05-19

Table of contents

Table of contents

1. Foreword 1

Notes on the documentation 1
Safety Instructions 2

2. Technical data 3

3. Connection 3

KL3311 3
KL3312 (KL3302) 4
KL3314 4

4. Functional description 5

5. Terminal configuration 8

6. Register Description 9

General Description of Registers 9
Terminal-specific register description 12
Control and Status byte 14
Register communication 15

7. Appendix 17

Mapping 17
Register Table 20
Support and Service 21

KL3311, KL3312, KL3314 and KL3302

Foreword

Foreword

Notes on the documentation

This description is only intended for the use of trained specialists in control and automation engineering
who are familiar with the applicable national standards. It is essential that the following notes and
explanations are followed when installing and commissioning these components.

Liability Conditions

The responsible staff must ensure that the application or use of the products describe d satisfy all the
requirements for safety, including all the relevant laws, regulations, guidelines and standards.

The documentation has been prepared with care. The products described are, however, constantly under
development. For that reason the documentation is not in every case checked for consistency with
performance data, standards or other characteristics. None of the statements of this manual represent s a
guarantee (Garantie) in the meaning of § 443 BGB of the German Civil Code or a statement about the
contractually expected fitness for a particular purpose in the meaning of § 434 par. 1 sentence 1 BGB. In
the event that it contains technical or editorial errors, we retain the right to make alterations at any time
and without warning. No claims for the modification of products that have already been supplied may be
made on the basis of the data, diagrams and descriptions in this documentation.

Delivery conditions

In addition, the general delivery conditions of the company Beckhoff Automation GmbH apply.

Copyright

©

This documentation is copyrighted. Any reproduction or third party use of this publication, whether in

whole or in part, without the written permission of Beckhoff Automation GmbH, is forbidden.

KL3311, KL3312, KL3314 and KL3302 1

Foreword

Safety Instructions

State at Delivery

All the components are supplied in particular hardware and software configurations appropriate for the
application. Modifications to hardware or software configurations other than those described in the
documentation are not permitted, and nullify the liability of Beckhoff Automation GmbH.

Description of safety symbols

The following safety symbols are used in this documentation. They are intended to alert the reader to the
associated safety instructions..

This symbol is intended to highlight risks for the life or health of personnel.

Danger

This symbol is intended to highlight risks for equipment, materials or the

Attention

environment.
This symbol indicates information that contributes to better understanding.

i

Note

2 KL3311, KL3312, KL3314 and KL3302

Technical data

Technical data

Technical data KL3311 KL3302* KL3312 KL3314

Number of inputs

Power supply

Thermocouple sensor type

Connection

Temperature range within the respective defined range of the sensor

Resolution

Broken lead detection

Conversion time

Meas. error (total meas.

range)

Electrical isolation

Current consumption from

K-Bus

Bits width in process

image

Configuration

Weight

Operating temperature

Storage temperature

Relative humidity

Vibration / shock

resistance

EMC resistance burst / ESD

Installation position

Protection class

1 2 2 4
via the K-Bus
Types J, K, L, B, E, N, R, S, T, U (default setting type K), mV measurement
2 wire

(Default: type K; -100° ... 1370°C)

0.1°C per digit
yes no yes yes
~ 200 ms ~ 250 ms
< ± 0.5% (of the full scale value)

500 V
typically 65 mA

Input: 1 x 16 bits of data
(1 x 8 bits control/status
optional)

no address setting, configuration via bus coupler or controller
approx. 70 g
0°C ... +55°C

-25°C ... +85°C
95 % no condensation
according to EN 60068-2-6 / EN 60068-2-27, EN 60068-2-29

according to EN 61000-6-2 / EN 61000-6-4
any
IP20

(K-Bus/signal voltage)

rms

Input: 2 x 16 bits of data
(2 x 8 bits control/status
optional)

Input: 4 x 16 bits of data
(4 x 8 bits control/status
optional)

*) KL3302 is no longer available and was replaced with KL3312.

Connection

KL3311

KL3311, KL3312, KL3314 and KL3302 3

Connection

KL3312 (KL3302)

KL3314

4 KL3311, KL3312, KL3314 and KL3302

Functional description

Functional description

The thermocouple terminals KL3311, KL3302 (without broken wire

detection), KL3312 and KL3314 can evaluate type J, K, B, E, N, R, S, T, U
and L thermocouples. The characteristic curves are linearized and the
reference temperature determined directly within the terminal.
Temperatures are output in 1/10°C. The terminal is fully configurable via
the Bus Coupler or the control. Different output formats may be selected or
own scaling activated. In addition, linearization of the characteristic curve
and determination and calculation of the reference temperature
(temperature at the terminal connection contacts) can be switched off.

Functioning Thermocouples can be classified as active measuring sensors. They

exploit the thermo-electric effect (Seebeck, Peltier, Thomson). Where two
electrical conductors of different materials (e.g. iron and constantan) make
contact, charge is transferred across the contact surface. A contact
potential develops, and is strongly dependent on temperature. The
thermally generated voltage is both a function of the temperature being
measured, T, and of the reference temperature, T

, at the point where

v

contact is made with the thermocouple. Since the coefficients are
determined at a reference temperature of 0°C, it is necessary to
compensate for the effect of the reference temperature. This is done by
converting the reference temperature into a reference voltage that depends
on the type of thermocouple, and adding this to the measured thermal
voltage. The temperature is found from the resulting voltage and the
corresponding curve.

U

= U

k

meas

+ U

ref

T

= f(Uk)

aus

Process data output format In the delivery state, the measured value is displayed in increments of

1/10 °C in two's complement format (integer). Other display types can be
selected via the feature register (e.g. sign/amount representation, Siemens
output format).

Measured value Hexadecimal output Signed integer output

-200.0°C

-100.0°C

-0.1°C

0.0°C

0.1°C

100.0°C

200.0°C

500.0°C

850.0°C

1,000.0°C

0xF830 -2000
0xFC18 -1000
0xFFFF -1
0x0000 0
0x0001 1
0x03E8 1000
0x07D0 2000
0x1388 5000
0x2134 8500
0x2710 10000

Voltage limits U

k

> U

: Bits 1 and 6 (over range and error bits) in the status byte are

kmax

set. The linearization of the characteristic curve is continued with the
coefficients of the upper range limit up to the limit stop of the A/D converter
or to the maximum value of 0x7FFF.

KL3311, KL3312, KL3314 and KL3302 5