ExternalSensoris an optional component from DeviceZoneTypeand includes variables for the operation with an external temperature sensor. The temperature sensor is connected at the TCD directly or the value can come from the connected machine.

Table 10– ExternalSensorType Definition

Attribute

Value

BrowseName

ExternalSensorType

IsAbstract

False

References

Node Class

BrowseName

DataType

TypeDefinition

Other

Subtype of 0:aseObjectType defined in OPC UA Part 5

0:HasComponent

Variable

ActualValue

0:Double

0:AnalogItemType

M, RW

0:HasProperty

Variable

Used

0:Boolean

0:PropertyType

M, RO

0:HasComponent

Method

ExternalSensorModeOn

M

0:HasComponent

Method

ExternalSensorModeOff

M

0:HasComponent

Variable

ThermocoupleType

0:UInt16

0:MultiStateValueDiscreteType

M, RW

0:HasComponent

Variable

CommunicationProtocolType

0:UInt16

0:MultiStateValueDiscreteType

M, RW

0: HasProperty

Variable

AutomaticModeSwitch

0:Boolean

0:PropertyType

O, RW

0:HasComponent

Object

ClosedLoopControl

3:ClosedLoopControlType

O

Description:Actual value of external temperature sensor

Unit:°C or °F

Example: 41.0

The value is only writeable if the CommunicationProtocolTypeis OPC_UA (value 3).

Description:Return whether an external temperature sensor is used for control

Example: true

Description:Activate the mode where the external temperature sensor is used for temperature control

Signature

ExternalSensorModeOn ();

Description:Deactivate the mode where the external temperature sensor is used for temperature control

Signature

ExternalSensorModeOff ();

This two Variablesare used to specify the type of connected external temperature sensor and the used communication protocol between the sensor and the control system of the TCD.

The TypeDefinitionfor both Variablesis MultiStateValueDiscreteType,so the Properties EnumValuesand ValueAsTextmust be filled with the supported values out of Table 11and Table 12.

Table 11– Values for ThermocoupleType

EnumValue

ValueAsText

Description

0

OTHER

Other sensor type

1

E

Type E sensor: NiCr-CuNi

2

J

Type J, L sensor: Fe-CuNi

3

K

Type K sensor: NiCr-Ni

4

N

Type N sensor: NiCrSi-NiSi

5

T

Type T sensor: Cu-CuNi

6

PT100

Pt 100-Sensor

Table 12– Values for CommunicationProtocolType

EnumValue

ValueAsText

Description

0

OTHER

Other connection type

1

LOCAL

Communication integrated in the local control system (local input)

2

PROFIBUS

Values via Profibus

3

OPC_UA

Values via OPC UA

4

I2C

Values via I2C

5

CAN

Values via CAN

Which sensor types and protocols and combinations are supported is device dependent. Especially when the CommunicationProtocolTypehas the value 1 (LOCAL), the ThermocoupleTypecould be set to a fixed value by the TCD.

Setting whether switching to external sensor is performed automatically (TRUE) or manually (FALSE). If TRUE, temperature control is regulated to the external sensor when the external sensor is plugged, and again switched automatically to the internal measurement site when the external sensor is unplugged.

With this Objectof ClosedLoopControlType (defined in OPC 40083)the client can do settings for the closed loop control for the sensor.