INFICON BCG450-SD ATM User Manual

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Communication Protocol

DeviceNet™

Interface for Bayard-Alpert Capacitance Diaphragm Gauge

BCG450-SD

tira40e1 (2005-04) 1

Intended Use of this Document

This Communication protocol contains instructions for operating the vacuum gauges BCG450-SD (featuring DeviceNet interfaces) as slaves together with a DeviceNet master.

This manual describes the functionality of DeviceNet for programming purposes. For more information refer to the "DeviceNet specifications" of the Open DeviceNet Vendor Association (ODVA) (→  [2]) and the corresponding european standard (→  [3]).

For specifications and operation instructions of the vacuum gauges refer to the appropriate documents:

BCG450-SD →  [1], [4], [5], [6]

DeviceNet Interface

Abbreviations

The following description of the DeviceNet Interface is compliant to the DeviceNet specification of the Open DeviceNet Vendor Association.

This manual describes the functionality of a DeviceNet Group 2 Only Slave and supports Explicit Messaging and the I/O Polling.

We reserve the right to make technical changes without prior notice.

Abbr. Meaning

NV Nonvolatile; attribute value is maintained through power cycles

V Volatile

INT Integer value (Range –32767 … 32768)

UINT Unsigned integer value (Range 0 … 65635)

USINT Unsigned character value (Range 0 … 255)

FLOAT Floating point value (Range according to IEEE 754)

XX XX XX

Hexadecimal number (Radix = 16)

Decimal number (Radix = 10)

Binary number (Radix = 2)

Trademarks

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DeviceNet™ Open DeviceNet Vendor Association Inc.

Contents

Intended Use of this Document 2 DeviceNet Interface 2 Abbreviations 2 Trademarks 2

1 Start-Up of the Slave 4

1.1 Power Supply Requirements 4

1.2 Front View of the BCG450-SD 4

1.3 Connectors on the Device 5

1.4 Side View of the BCG450-SD 6

1.5 Indicators and Switches 6

1.5.1 Module Status LED 6

1.5.2 Network Status LED 7

1.5.3 Node Address Switch 7

1.5.4 Data Rate Switch 7

1.5.5 Setpoint 7

2 Object Structure 8

2.1 Connection Object 8

2.1.1 Vendor-Specific Object Extension on Instance 2 Poll Connection 8

2.2 Identity Object 9

2.2.1 Class Attributes 9

2.2.2 Instance Attributes 9

2.3 S-Device Supervisor Object 9

2.3.1 Class Attributes 9

2.3.2 Instance Attributes 10

2.3.2.1 Semantics 11

2.3.3 S-Device Supervisor Object States 15

2.3.4 S-Device Supervisor Common Services 15

2.3.5 S-Device Supervisor Object Specific Services 16

2.4 S-Analog Sensor Object 16

2.4.1 Class Attributes 16

2.4.2 Instance Attributes 17

2.4.2.1 Instance Attributes of Instance 1 / Pirani Instance 17

2.4.2.2 Semantics of S-Analog Sensor Instance 1 18

2.4.2.3 Instance Attributes of Instance 2 / Hot Cathode Ion Gauge 20

2.4.2.4 Semantics of S-Analog Sensor Instance 2 21

2.4.2.5 Instance Attributes of Instance 3 / Capacitance Diaphragm Gauge 23

2.4.2.6 Semantics of S-Analog Sensor Instance 3 24

2.4.2.7 Object-Specific Services on Instance 3 / Capacitance Diaphragm Gauge 25

2.4.2.8 Instance Attributes of Instance 21 / Setpoint A (Instance 22 / Setpoint B) 26

2.4.3 Common Services 29

2.4.4 Object-Specific Services on Instance 2 / Hot Cathode Ion Gauge 29

2.4.4.1 SET DEGAS STATE 29

2.4.4.2 SET EMISSION STATE 29

2.4.4.3 Emission Control Mode 30

2.4.5 Behavior 30

3 I/O Assembly Object 31

3.1 I/O Assembly Instances 31

3.2 I/O Assembly Object Instance Data Attribute Format 32

Appendix 33

A: Range of Values 33 B: Specific Codes 33 C: Conversion of a Floating Number According to IEEE 754 33 D: Typical Start-Up Procedure 34 E: Literature 37

For cross-references within this document, the symbol (→  XY) is used, for crossreferences to further documents listed under literature, the symbol (→  [Z]).

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1 Start-Up of the Slave

1.1 Power Supply Requirements

1.2 Front View of the BCG450-SD

The BCG450-SD has to be powered with two voltages:

1.) 24 Volt DC, 20 W at the 15 pole Sub-D connector for the gauge itself;

2.) 24 Volt DC nominal, <2 W range +11 … +25 V) at the DeviceNet micro style connector for the DeviceNet transceiver.

Position Function

1 Address Switch × 10, decimal 2 Address Switch × 1, decimal 3 DeviceNet connector 4 Data Rate Switch 5 Network Status LED 6 Module Status LED 7 "Sensor cable" connector

(Power, analog I/O, RS232C I/O and Relay contacts)

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1.3 Connectors on the Device

The BCG450-SD uses a "Sealed Micro-Style Connector" for the DeviceNet connection. The DeviceNet part of the gauge is powered via the DeviceNet connector.

Pin Assignment of the Sealed Micro-Style Connector

Pin Assignment of the 15 pin D-Sub connector

Pin Function

1 Drain 2

V+ nominal +24 V (range +11 … +25 V) 3V– 4 CAN_H 5 CAN_L

Pin Function

1 Relay Setpoint A, n.o. contact 2 Measuring signal output (0 … +10.13 V) 3 Threshold Setpoint A, output (0 … +10 V)

4 Relay Setpoint A, common contact 5 Supply sensor electronics common

6 Threshold Setpoint B output (0 … +10 V) 7 Degas on, active high 8 Supply sensor electronics +24 Volt 9 Relay Setpoint B, n.o. contact

10 Gauge identification 11 Relay Setpoint B, common contact

12 Signal common GND 13 do not connect 14 do not connect 15 do not connect

Type of setpoint function assigned to relays is programmable (→  26).

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1.4 Side View of the BCG450-SD

1.5 Indicators and Switches

Position Function

8 Potentiometer for Setpoint A threshold 9 Potentiometer for Setpoint B threshold

10 Special Calibration service / do not use

1.5.1 Module Status LED

Device State LED State Description Power Off dark No power applied to device Device Self-Test flashing

green/red Device Operational green Device is operating normally. Unrecoverable Fault red Device has detected an unrecoverable fault Recoverable Fault flashing red Device has detected a recoverable fault,

Device is in self-test

e.g. missing DeviceNet power supply

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1.5.2 Network Status LED

1.5.3 Node Address Switch

1.5.4 Data Rate Switch

1.5.5 Setpoint

The network status LED indicates the status of the DeviceNet communication link.

State LED state To indicate Not Powered/not online dark Device is not online.

• The device has not completed the Duplicate MAC_ID test yet.

• The device may not be powered, look at Module Status LED.

Online, not connected flashing

green

Device is online but has no connections in the established state.

• The device has passed the Dup_MAC_ID test, is online, but has no established connections to other nodes.

• The device is not allocated to a master.

Link OK online, connected green The device is online and has connec-

tions in the established state.

• The device is allocated to a master.

Connection time out flashing

red

One or more I/O Connections are in the timed out state.

Critical link failure red Failed communication device. The

device has detected an error that has rendered it incapable of communicating on the network (Duplicate MAC ID, or Bus–off).

During device initialization, the node address switches are read by the device firmware. If the switches specify a valid DeviceNet MAC ID, i.e. a value from 0 … 63, this value is used as the device MAC ID. If the specified MAC ID differs from the value stored in the device’s non-volatile RAM (NVRAM), the new MAC ID will be saved in NVRAM. If the switches specify an invalid DeviceNet MAC ID, i.e. a value greater than 63, the current value stored in the device’s NVRAM is used as the device MAC ID.

A single, rotary switch is provided for configuring the data rate of the device. The switch has three valid positions for the DeviceNet data rates, 125, 250, and 500 kBaud, where:

1 125 kBaud 2 250 kBaud 5 500 kBaud

All remaining switch positions specify software selection of the data rate.

The device has two setpoint relays 1) (Setpoint A and Setpoint B). The setpoints of these relays are adjustable only by two potentiometers (marked SETPOINT A and SETPOINT B).

The relay contacts are available at the 15-pin D-Sub connector.

Type of setpoint function assigned to relays is programmable (→  26).

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2 Object Structure

2.1 Connection Object

2.1.1 Vendor-Specific Object Extension on Instance 2 Poll Connection

Class Code 05h = 05

The connection class allocates and manages the internal resources associated with both I/O and explicit messaging connections. The specific instance generated by the connection class is referred to as a connection instance or a connection object.

The following Instances of the connection object are supported:

• Instance 1: Explicit Messaging

• Instance 2: I/O-Polling

Please refer to the DeviceNet specification for further information.

For the selection of the active input assembly the following vendor specific attribute can be used.

Vendor specific extension:

AttributeIDRequirement in

Implementation

100 Optional Get/Set NV Poll Produce

Access

Rule

NV/V Name DeviceNet

Assembly Instance

This vendor-specific attribute facilitates the configuration of the data assembly, sent by the BCG450-SD to the DeviceNet Master as Poll response. It offers the possibility to select a (predefined) data assembly via a configuration tool + EDS file (→  [1]). Attribute 100 allows the user to configure the Poll I/O Data Assembly via EDS even when the Poll Connection of the BCG450-SD is in the established state. The Assembly Number is stored non volatile. Modifications of the Poll Produce Assembly Instance will take effect only after a reset of the BCG450-SD.

Thus, definition of the BCG450-SD data assembly can be done in two ways:

1) Standard methode (without using attribute 100): The DeviceNet Master configures the "Produced Connection Path" Attribute of the Poll connection (Connection Instance 2) when establishing communication to the BCG450-SD. This requires a master to support expanded explicit messaging capabilities.

2) Directly setting Attribute 100 e.g. by a configuration tool (e.g. RS Networks) + Device Reset.

Description of Attribute Semantics

Data Type

USINT Contains the Instance num-

ber of the assembly used by this connection to send data

1, 2, 4, 5, 8, 9, 10, 12, 13

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2.2 Identity Object

Class Code 01h = 01

2.2.1 Class Attributes

Attribute ID Access Rule Name DeviceNet

1 Get Revision UINT Revision of this object.

2 Get Max Instance UINT Maximum instance number of

This object provides identification of and general information about the device.

Description of Attribute Semantics of Values

Data Type

The current value assigned to this Note: All class definitions are required to include this class attribute.

an object currently created in this class level of the device.

attribute is one (01). If updates that

require an increase in this value are

made, then the value of this attribute

increases by one.

The largest Instance number of a

created object at this class hierarchy

level.

2.2.2 Instance Attributes

Attribute ID Access Rule NV/VName DeviceNet Data Type Description of Attribute

1 Get NV Vendor ID UINT 79 02 Manufacturer identification

Value: 633 (INFICON) 2 Get NV Device Type UINT 1Ch = Vacuum pressure gauge 3 Get NV Product Code UINT 13 4 Get NV Revision STRUCT 5 Get NV Status WORD 6 Get NV Serial Number UDINT 7 Get NV Product Name SHORT STRING BCG450-SD

Services

2.3 S-Device Supervisor

Service Code Name Description 5 (05h) Reset 0 = last installation,

1 = default installation

14 (0Eh) Get_Attribute_Single

Class Code 30h = 48

Object

2.3.1 Class Attributes

Attribute ID Access

Rule

1 Get Revision UINT Revision of this object The current value assigned to this at-

2 Get Max

Name DeviceNet

Data Type

UINT Maximum instance number of an

Instance

Description of Attribute Semantics of Values

tribute is one (01). If updates that require an increase in this value are made, then the value of this attribute increases by one.

The largest Instance number of a creobject currently created in this class level of the device.

ated object at this class hierarchy level.

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2.3.2 Instance Attributes

Attribute ID Access Rule NV/VName DeviceNet Data Type Description of Attribute

3 Get NV DeviceType SHORT STRING ASCII Text, "CG" combination gauge 4 Get NV SEMI Standard

Revision Level

5 Get NV Manufacturer’s Name SHORT STRING "INFICON" 6 Get NV Manufacturer’s Model

Number

7 Get NV Software Revision

Level

8 Get NV Hardware Revision

Level

9 Get NV Manufacturer’s Serial

Number

10 Get NV Device Configuration SHORT STRING Depending on device configuration

11 Get V Device Status USINT 12 Get V Exception Status BYTE 13 Get V

Exception Detail Alarm

Common Exception Detail

Size 2 USINT Number of common detail bytes Detail 0 ARRAY of: Detail 1 BYTE

Device Exception Detail

Size 6 USINT Number of device detail bytes Detail 0 ARRAY of: S-Analog Sensor Instance 3

Detail 1 BYTE S-Analog Sensor Instance 3

Detail 2 S-Analog Sensor Instance 1

Detail 3 S-Analog Sensor Instance 1

Detail 4 S-Analog Sensor Instance 2

Detail 5 S-Analog Sensor Instance 2

Manufacturer Exception Detail

Size 1 USINT Number of Manufacturer detail bytes Detail 0 ARRAY of: Serial communication alarm

SHORT STRING Specifies the revision level of the SEMI

S/A network standard to which the device complies (for example "E54-0997").

SHORT STRING for example: BCG450-SD

SHORT STRING ASCII Text, for example "xxxyyy"

xxx version of the measuring print yyy version of the DeviceNet print

SHORT STRING ASCII text, for example "1.001"

SHORT STRING ASCII text

(→ Appendix B)

→ "Semantics" section below. → "Semantics" section below.

STRUCT of: A structure of three structures containing

a bit mapped representation of the alarm detail

STRUCT of:

→ "Semantics" section below. → "Semantics" section below.

STRUCT of:

(Capacitance Diaphragm Gauge)

Sensor alarm byte 0

(Capacitance Diaphragm Gauge)

Sensor alarm byte 1

(Pirani) Sensor Alarm byte 0

(Pirani) Sensor alarm byte 1

(Hot cathode) Sensor Alarm byte 0

(Hot cathode) Sensor alarm byte 1

STRUCT of:

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Attribute ID Access Rule NV/VName DeviceNet Data Type Description of Attribute

14 Get V

Exception Detail

STRUCT of: A structure of three structures containing

Warning

Common Exception

STRUCT of:

Detail

Size 2 USINT Number of Common Detail Bytes Detail 0 ARRAY of: Detail 1 BYTE

Device Exception

STRUCT of:

Detail

Size 7 USINT Number of Device Detail Bytes Detail 0 ARRAY of: S-Analog Sensor

Detail 1 ARRAY of: S-Analog Sensor Instance 3

Detail 2 BYTE S-Analog Sensor Instance 3

Detail 3 BYTE

Detail 4

Detail 5 S-Analog Sensor Instance 2

Detail 6 S-Analog Sensor Instance 2

Manufacturer

STRUCT of:

Exception Detail

Size 1 USINT Number of Manufacturer Detail Bytes

Detail 0 Byte serial common warning 15 Set NV Alarm Enable BOOL 16 Set NV Warning Enable BOOL

a bit mapped representation of the warning detail

→ "Semantics" section below. → "Semantics" section below.

Class Level Status Extension

(Capacitance Diaphragm Gauge)

Sensor Warning Byte 0

(Capacitance Diaphragm Gauge)

Sensor Warning Byte 1 S-Analog Sensor Instance 1 (Pirani)

Sensor Warning Byte 0 S-Analog Sensor Instance 1 (Pirani)

Sensor Warning Byte 1

(hot cathode) Sensor Warning Byte 0

(hot cathode) Sensor Warning Byte 1

→ "Semantics" section below. → "Semantics" section below.

2.3.2.1 Semantics

Device Status

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This attribute represents the current state of the device. Its value changes as the state of the device changes. The following values are defined:

Attribute Value State

0 Undefined 1 Self Testing 2 Idle 3 Self-Test Exception 4 Executing 5 Abort 6 Critical Fault

In case of a Self-Test Exception restart the device with a reset out of the box (Identity Object Class 1, Instance 1, Service 5, Service target value: 1).

Exception Status

A single byte attribute whose value indicates the status of the alarms and warnings for the device. The device supports the Expanded Mode.

For the Expanded Mode, bit seven of Exception Status attribute is set to one; exceptions are reported through the communication of this Exception Status attribute, formatted as specified in the table below. In addition, the Exception Detail attributes are supported. The Exception Status bits are determined by a logical ”OR” of the related Exception Detail bits, as indicated.

Exception Status Bit Map

Exception Detail Alarm and Exception Detail Warning

Bit Function

0 ALARM/device-common

(The alarm or warning is not specific to the device type or device type

manufacturer.) 1 ALARM/device-specific 2 ALARM/manufacturer-specific 3 reserved, set to 0 4 WARNING/device-common 5 WARNING/device-specific 6 WARNING/manufacturer-specific 7

1 Expanded Method

The formats of these two attributes are identical. Therefore, they are described together:

Attributes that relate the detailed status of the alarms or warnings associated with the device. Each attribute is a structure containing three members; these three members, respectively relate the detailed status of exceptions that are common (i.e., not device-specific), device-specific but not manufacturer-specific, and manufacturer-specific. The common and device-specific detail are defined below. A manufacturer-specific detail has a length of 1 byte. A SIZE value of one indicates that one byte detail is defined for the associated exception detail structure.

Each of the three structure members is defined as a structure containing an ordered list (i.e., array) of bytes of length SIZE, and an unsigned integer whose value is SIZE. Each of the bytes in each array has a specific mapping. This mapping is formatted as 8 bits representing 8 independent conditions, whereas a value of 1 indicates that the condition is set (or present), and a value of 0 indicates that the condition is cleared (or not present). Note that if a device does not support an exception detail, the corresponding bit is never set. The bitmaps for alarms and warnings in the corresponding attributes are structured in parallel so that a condition may have either alarm or warning set depending on severity. If a condition inherently cannot be both alarm and warning, then the parallel bit position corresponding to the other state will remain "0".

Common Exception Detail

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This structure relates exception conditions (i.e. alarms or warnings) which are common to all devices within the Hierarchy of Semiconductor Equipment Devices. The Detail element of the structure is an ordered list (i.e., array) of bytes of length [SIZE=2] which is the value of the structure element Size. For each byte in the Detail field, all bits which are not identified are reserved for future standardization.

Two bytes Common Exception Detail are provided: Common Exception Detail [0] and Common Exception Detail [1]. The specific exception associated with each of the bitmaps is given in the table below. The SIZE for this revision is two (2).

Common Exception Detail Attribute Values

Bit Common Exception Detail [0] Common Exception Detail [1]

00 0 10 0 2 EPROM exception 0 3 EEPROM exception power supply input voltage 4 RAM exception 0 5 reserved 0 60 0 70 0

Common Exception Detail Format Summary

Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Common Exception Detail

Size Common Exception Detail 0

Common Exception Detail 1

00000010

0000

Data

Memory

Nonvolatile

Memory

PS Input

Voltage

Code

Memory

000

Device Exception Detail

Manufacturer Exception Detail

This structure, similar in form to Common Exception Detail, relates exception conditions which are specific to individual devices on the network and are defined in the following. The Detail element of the structure is an ordered list (i.e. array) of bytes of length [SIZE = 4 for Alarms and SIZE = 6 for Warning] which is the value of the structure element size.

This structure, similar in form to Common Exception Detail, relates exception conditions which are specific to the manufacturers of individual devices on the network. There is one byte manufacturer exception details defined. The Detail element of the structure is an ordered list (i.e. array) of bytes of length [SIZE = 1] which is the value of the structure element Size.

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Device Exception Detail Alarms and Manufacturer Exception Detail Alarms Format

Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Device Exception Detail

Alarm Size Device Exception Detail

Alarm 0 Capacitance

Diaphragm Gauge

Device Exception Detail Alarm 1 Capacitance

Diaphragm Gauge

Device Exception Detail Alarm 0 Pirani

Device Exception Detail Alarm 1 Pirani

Device Exception Detail Alarm 2 Hot cathode

Device Exception Detail Alarm 3 Hot cathode

Manufacturer Exception Detail Alarm Size

Manufacturer Exception Detail Alarm

00000110

0 0 0 0 0 0 0 Diaphragm

0 0 0 0 0 0 Electronics

00000000

000000

00000000

000000

00000001

0 0 0 0 0 0 0 serial comm.

Failure

Electronics

Failure

Electronics

Failure

Exception Detail Warning

Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Device Exception Detail

Warning Size Device Exception Detail 0

S-Analog Sensor Class Level Status Extension

Device Exception Detail 1 Sensor Warning Byte 0

Capacitance Diaphragm Gauge

Device Exception Detail 2 Sensor Warning Byte 1

Capacitance Diaphragm Gauge

Device Exception Detail 3 Sensor Warning Byte 0

Pirani

Device Exception Detail 4 Sensor Warning Byte 1

Pirani

Device Exception Detail 5 Sensor Warning Byte 0

Hot cathode

Device Exception Detail 6 Sensor Warning Byte 1

Hot cathode

Manufacturer Exception Detail Warning Size

Manufacturer Exception Detail Warning

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0000011 1

00000Underrang

0000000 0

000000Electronics

0000000 0

000000Electronics

0000000 0

0000

0000000 1

0000000

Logical inversion of Reading Valid.

Pressure

too high

for degas

Exceeded

00 0

Overrange Exceeded

Warning

Reading

Invalid

serial comm.

Warning

Alarm Enable and Warning Enable

These Boolean attributes are used to enable (1) or disable (0) the S-Device Supervisor object’s process of setting Exception bits. When disabled, corresponding bits are never set; and, if they were set, disabling clears them. Also, alarm and warning states are not retained; when enabled, bits will be set only if the corresponding condition is true.

The default state for these Enable attributes is enabled (1).

2.3.3 S-Device Supervisor Object States

Power Applied, or Reset Request from any state except CRITICAL FAULT, or Perform Diagnostics Request from any state except CRITICAL FAULT or ABORT

Self-Test Failed

SELF-TEST

EXCEPTION

ABORT

CRITICAL FAULT

Critical Fault

from any state

Self-Test

Passed

Stop

Request

SELF-TESTING

IDLE

EXECUTING

Recover Request or Exception Condition

Cleared

Abort Request

Recover Request

Start

Request

Abort Request

2.3.4 S-Device Supervisor Common Services

Abort - Used to transition the device application objects to the aborted state. This

service request may be (and generally will) originated internally, from application objects.

Recover - Used to transition the device application objects, out of the abort state, to the idle state. This service request may be originated internally, from application objects.

Perform_Diagnostics - Used to instruct the DS object to perform a diagnostic test.

Service

Service Name Description of Service

Code

Get_Attributes_Single Returns the contents of the specified

attribute. 10 05 06 07

Set_Attributes_Single Modifies an attribute value.

Reset

Start Starts the device execution.

Stop

Resets the device to the Self-Testing state.

Moves the device to the Idle state.

The device transitions from the IDLE state to the EXECUTING state by a START Request (Service Code 06

) or by the receipt of the first valid I/O

data. You will not get any valid measurement values from the device until this ser-

vice has been requested or the I/O-poll message has been received.

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2.3.5 S-Device Supervisor Object Specific Services

Service

Service Name Description of Service

Code

4B 4ChRecover

Abort

Moves the device to the Abort state Moves the device out of the Abort state

4DhPerform_Diagnostics Causes the device to perform a set of

diagnostic routines

Explanation to Service code 4D

• DS Object Service Parameter dictionary Parameter Form Description

TestID USINT Type and possibly detail of diagnostic test to be

performed

• TestID parameter

The following values are defined for the TestID parameter for the Perform_Diagnostics Service Request:

Attribute Value State

0 Standard

Type "Standard" is specified if there is only one type of diagnostic defined or if there are more than one including a type standard.

2.4 S-Analog Sensor Object

Class Code 31

= 49

2.4.1 Class Attributes

Attribute ID Access

Rule

1 Get Revision UINT Revision of this object Note: All class definitions are

2 Get Max

Get Class

94 Get Active

95 Get Active

96 Get Number of

99 Get Subclass UINT Identifies a subset of additional class attributes,

Name DeviceNet

Data Type

UINT Maximum instance number of an object currently

Instance

USINT Indicates whether the complete gauge (including Level Status Extension

Specified Value

by Data

Type

UINT Identifies the object instance that is providing the Instance Number

USINT Identifies the number of gauge instances present in Gauges

Description of Attribute Semantics of Values

required to include this class attribute.

created in this class level of the device.

instances Capacitance Diaphragm Gauge, Pirani and Hot Ion) measures above or below its maximum or minimum measurement range.

Is used by assemblies to produce this class-level attribute, instead of the Value (Attribute ID 6) of the S-Analog Sensor Instances.

Value which is copied into the Active Value for all input Assemblies and the Alarm/Warning Exception Details for the S-Device Supervisor object.

→ Behavior section.

the device.

services and behaviors.

The current value assigned to this attribute is one (01).

The largest Instance number of a created object at this class hierarchy level.

Bit 0: Reading Invalid Bit 1: Overrange Exceeded Bit 2: Underrange Exceeded

Default = 1

1 Instance Selector

This attribute is not part of the actual S-Analog Sensor Specification, bit is at

this time in preparation to be implemented as shown. Changes may be possible until the new specificationis published.

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Active Value

Assemblies or connections may produce this class-level attribute, instead of the Value (Attribute ID 6) of the active S-Analog Sensor instance. The S-Analog Sensor class-level attribute Active Instance Number identifies the object instance that is currently active and providing the Value to the Active Value class-level attribute which is, in turn, produced by the input assemblies that have Active Value as a member.

Active Instance Number

Number of Gauges

Class Level Status Extension

The device internally modifies this attribute, as required, to identify the S-Analog Sensor object instance providing the Value member which is copied into the Active Value for all Input Assemblies and the Alarm/Warning Exception Details for the S-Device Supervisor object.

The Active Instance Number will be modified based upon the Active Value in order that the best gauge, corresponding to a given S-Analog Sensor instance, will be active for the given measurement range.

This attribute is used to determine the size of all Input Assemblies within a node.

Because the gauge has three different measurement principles (Pirani, capacitance diaphragm gauge, hot ionization gauge) this attribute is supported to give you the information whether the gauge is outside the specified measurement range.

Gauge exposed to

Class Level Status Extension

pressure range

5×10

-10

… 1500 mbar

all bits set to "0"

>1500 mbar bits "Reading Invalid" and "Overrange Exceeded" set

<5×10

-10

mbar

bits "Reading Invalid" and "Underrange Exceeded" set

The Class Level Status Extension attribute is mapped to the Device Exception Detail Warning Byte 0 of the Device Supervisor Object.

2.4.2 Instance Attributes

Three S-Analog Sensor Instances (Instance 1, Instance 2, Instance 21 and Instance 22) are available. Instance 1 represents the physical sensor reading of the heat transfer vacuum gauge (pressure), Instance 2 represents the physical sensor reading of the hot cathode ion gauge (pressure).

Instance 21 and Instance 22 represent the value of the Setpoint A and Setpoint B.

2.4.2.1 Instance Attributes of Instance 1 / Pirani Instance

AttributeIDAccess Rule NV/VName DeviceNet Data

3 Set /Cond.

→ below

NV Data Type USINT Determines the

Following is the Instance 1 with the subclass extension of the heat transfer vac- uum gauge (pirani gauge) part of the BCG450-SD. This instance is used to provide control and status information for the Pirani gauge part of the BCG450-SD.

Description of

Type

Attribute

Data Type of Value and all related attributes as specified in this table.

4 Set

→ below

NV Data Units UINT Determines the

Units context of Value and all related attributes.

5 Get V Reading Valid BOOL Indicates that the

Value attribute contains a valid value.

6 Get V Value INT or specified

Analog input value The corrected, converted, cali-

by Data Type

Semantics of Values

→ "Semantics" section below. Int C3 float CA

[default]

Supported Values: Counts 1001 mbar 1308 Torr 1301 Pascal 1309

[default]

h h h h

0 = invalid 1 = valid (invalid: e.g., not warmed up yet)

brated final value of the sensor. → "Semantics" section below.

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AttributeIDAccess Rule NV/VName DeviceNet Data

Type

7 Get V Status BYTE Alarm and Warning

10 Get NV Full Scale INT or specified

by Data Type

25 Set NV Safe State USINT Specifies the be-

26 Set NV Safe Value INT or specified

by Data Type

32 Get NV Overrange INT or specified

by Data Type

33 Get NV Underrange INT or specified

by Data Type

94 Get V Sensor Warning Struct of Byte Bit definitions of

95 Get V Sensor Alarm Struct of Byte Bit definitions of

96 Get V Status Extension BYTE Bit-mapped byte

99 Get NV Subclass UINT Defines a subset of

Description of Attribute

State of this object instance

The Value of Full Scale for the sensor.

havior for the Value for states other than Execute

The Value to be used for Safe State = Safe Value

Specifies the highest valid Value

Specifies the lowest valid Value

Sensor Warnings

Sensor Alarms

providing additional status bits

additional attributes, services and behaviors.

Semantics of Values

Always zero, because Alarm and Warning Trip Points are not implemented

The value of attribute Value corresponding to the Full Scale calibrated measurement of the sensor. [default] = maximum allowable value for the Data Type

→ "Semantics" section below. [default] = 0

The value above which attribute Reading Valid is set to invalid.

[default] = maximum allowable value for the Data Type

The value below which attribute Reading Valid is set to invalid.

[default] = minimum allowable value for the Data Type

0 = [default] → "Semantics" section 0 = [default] → "Semantics" section Bit description: 0 Reading Invalid

(Logical Inversion of

Reading Valid)

1 Overrange Exceeded 2 Underrange Exceeded

02 = Heat Transfer Vacuum Gauge

2.4.2.2 Semantics of S-Analog Sensor Instance 1

Data Type

Data Unit

18 tira40e1 (2005-04) BCG450SDv1.cp

All Data Type attributes use the enumerated values integer or float (→ Appendix A).

The Data Type value will be set automatically based upon the first valid I/O connection established by the device.

If no established I/O connections exist, which include an attribute from this object, then the Data Type attribute is settable provided that the object is in the Idle State.

Note: Using data type integer in combination with a pressure unit (mbar, Torr or Pa) will obviously not produce reasonable values below 1.

The Data Unit is only settable in the IDLE state.

Value

An S-Analog Sensor object instance derives a reading from a physical analog sensor. The reading is converted to the data type and units specified for the Value attribute.

Using Counts and INT the following conversion has to be used:

Safe State

Safe Value

Counts = [ log

where: k

k k

mbar Torr Pa

(pressure) + k ] × 2000

= 12.5 = 12.624903 = 10.5

This attribute specifies what value will be held in Value for states other than Exe- cuting. The purpose of this mechanism is to allow other devices, who may be using this Value to transition to (or remain in) a safe state in the event of this device transitioning to a FAULT, IDLE, or ABORT state. The following values are defined:

Attribute Value State

0 Zero 1 Full Scale 2 Hold Last Value 3 Use Safe Value

For Safe State set to Use Safe Value, this attribute holds the value to which the Value attribute will be set for object instance states other than Executing.

Sensor Alarm

16 Bits are used as Sensor faults. Sensor Alarm Byte 1 is mapped to the Device Exception Detail Alarm 3, Sensor Alarm Byte 0 is mapped to the Device Exception Detail Alarm 2.

Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Sensor Alarm Byte 0

Sensor Alarm Byte 1

Sensor Warning

00000000

000000

Electronics

Failure

16 Bits are used as Sensor Warnings. Sensor Warning Byte 0 is mapped to the Device Exception Detail Warning 3, Sensor Warning Byte 0 is mapped to the Device Exception Detail Warning 4.

Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Sensor Warning Byte 0

Sensor Warning Byte 1

Status Extension

00000000

000000

Electronics

Warning

8 Bits providing the current sensor alarm state of the instance

Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Sensor Alarm Byte 0

00000Underrange

Exceeded

Overrange

Exceeded

Reading

Invalid

tira40e1 (2005-04) BCG450SDv1.cp 19

2.4.2.3 Instance Attributes of Instance 2 / Hot Cathode Ion Gauge

Following is the Instance 2 with the subclass extension of the hot cathode ion gauge part of the BCG450-SD. This instance is used to provide control and status information for the hot cathode ion gauge part of the BCG450-SD.

AttributeIDAccess

Rule

3 Set/Cond.

→ below

5 Get V Reading

6 Get V Value INT or speci-

7 Get V Status BYTE Alarm and Warning State

10 Get NV Full Scale INT or speci-

25 Set NV Safe State USINT Specifies the behavior for

26 Set NV Safe

32 Get NV Overrange INT or speci-

33 Get NV Under-

88 Get V Degas

91 Get V Emission

93 Get V Emission

94 Get V Sensor

95 Get V Sensor

→

"Semantics"

NV/V Name DeviceNet

Data Type

NV Data Type USINT Determines the Data Type

NV Data Units ENGUNITS Determines the Units con-

BOOL Indicates that the Value

Valid

fied by Data Type if supported

INT or speci-

Value

range

Status

Current

Status

Warning

Alarm

fied by Data Type if supported

INT or specified by Data Type if supported

BOOL Indicates current degas

REAL Indicates setting level of

BOOL Indicates whether the

Structure of Byte

Description of Attribute Semantics of Values

of Value and all related attributes as specified in this table.

text of Value and all related attributes.

attribute contains a valid value.

Analog input value The corrected, converted, calibrated

of this object instance The Value of Full Scale for

the sensor.

the Value for states other than Execute

The Value to be used for Safe State = Safe Value

Specifies the highest valid

Value

Specifies the lowest valid

Value

state

emission current in amps

emission is turned ON or OFF

→ "Semantics" section [default] = INT

→ "Semantics" section [default] = Counts

0 = invalid 1 = valid (invalid: e.g., not warmed up yet)

final value of the sensor.

→ "Semantics" section

The value of attribute Value corresponding to the Full Scale calibrated measurement of the sensor.

[default] = maximum allowable value for the Data Type

→ "Semantics" section [default] = 0

The value above which attribute Reading Valid is set to invalid.

[default] = maximum allowable value for the Data Type

The value below which attribute Reading Valid is set to invalid.

[default] = minimum allowable value for the Data Type

0 OFF 1 ON

0, 25 µA, 5 mA, 20 mA

0 OFF 1 ON

default 0 → "Semantics"

20 tira40e1 (2005-04) BCG450SDv1.cp

AttributeIDAccess

Rule

96 Get V Status

NV/V Name DeviceNet

Data Type BYTE Bit mapped byte providing

Extension

Description of Attribute Semantics of Values

additional status bits

99 Get NV Subclass UINT Identifies the subset of

additional attributes, services and behaviors for hot cathode ion gauges

100 Get NV State

Emission Control

USINT Represents the state ac-

cording the service Set Control Mode

Mode

2.4.2.4 Semantics of S-Analog Sensor Instance 2

Bit description: 0 Reading Invalid

(Logical Inversion of

Reading Valid)

1 Overrange Exceeded 2 Underrange Exceeded

5 Hot Cathode Ion Gauge

0 = Auto 1 = Manual

Data Type Value

→ Instance 1 An S-Analog Sensor object instance derives a reading from a physical analog sen-

sor. The reading is converted to the data type and units specified for the Value attribute.

Using Counts and INT the following conversion has to be used:

Safe State

Safe Value

Sensor Alarm

Counts = [ log

where: k

k k

mbar Torr Pa

→ Instance 1

16 Bits are used as sensor faults . Sensor Alarm Byte 0 is mapped to the Exception

(pressure) + k ] × 2000

= 12.5 = 12.624903 = 10.5

Detail Alarm 4, Sensor Alarm Byte 1 ismapped to the Exception Detail Alarm 5.

Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Sensor Alarm Byte 0 Sensor Alarm Byte 1

00000000 000000

Electronics

Failure

Sensor Warning

16 Bits are used as sensor warnings. Sensor warning Byte 0 is mapped to the Exception Detail Warning 5, Sensor warning Byte 0 is mapped to the Exception Detail Warning 6.

Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Sensor Warning Byte 0 Sensor Warning Byte 1

tira40e1 (2005-04) BCG450SDv1.cp 21

00000000

mbar.

Pressure too high for degas

000

0000

The bit "Pressure too high for degas" will be set if the pressure is above

-6

7.2×10 pressure is below 7.2×10

mbar when a degas service is requested. The bit will be reset when the

-6

Status Extension

8 Bits providing the current sensor alarm state of the instance

Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Sensor Alarm Byte 0

00000Underrange

Exceeded

Overrange

Exceeded

Reading

Invalid

22 tira40e1 (2005-04) BCG450SDv1.cp

2.4.2.5 Instance Attributes of Instance 3 / Capacitance Diaphragm Gauge

Following is the Instance 3 with the subclass extension of the capacitance diaphragm gauge part of the BCG450-SD. This instance is used to provide control and status information for the capacitance diaphragm gauge part of the BCG450-SD.

AttributeIDAccess

Rule

3 Set/Cond.

→ below

NV/V Name DeviceNet

Description of Attribute Semantics of Values

Data Type

NV Data Type USINT Determines the Data Type

of Value and all related attributes as specified in this table.

→

"Semantics"

NV Data Units ENGUNITS Determines the Units con-

text of Value and all related attributes.

5 Get V Reading

Valid

BOOL Indicates that the Value

attribute contains a valid value.

6 Get V Value INT or speci-

Analog input value The corrected, converted, calibrated fied by Data Type if supported

7 Get V Status BYTE Alarm and Warning State

of this object instance

10 Get NV Full Scale INT or speci-

fied by Data

The Value of Full Scale for

the sensor. Type if supported

25 Set NV Safe State USINT Specifies the behavior for

the Value for states other

than Execute

26 Set NV Safe

Value

INT or specified by Data

The Value to be used for

Safe State = Safe Value Type if supported

32 Get NV Overrange INT or speci-

fied by Data

Specifies the highest valid

Value Type if sup-

ported

33 Get NV Under-

range

INT or specified by Data

Specifies the lowest valid

Value Type if sup-

ported

94 Get V Sensor

Warning

95 Get V Sensor

Alarm

96 Get V Status

Extension

Structure of Byte

BYTE Bit mapped byte providing

additional status bits

99 Get NV Subclass UINT Identifies the subset of

additional attributes, serv-

ices and behaviors for hot

cathode ion gauges

→ "Semantics" section [default] = INT

→ "Semantics" section [default] = Counts

0 = invalid 1 = valid (invalid: e.g., not warmed up yet)

final value of the sensor.

→ "Semantics" section

The value of attribute Value corresponding to the Full Scale calibrated measurement of the sensor.

[default] = maximum allowable value for the Data Type

→ "Semantics" section [default] = 0

The value above which attribute Reading Valid is set to invalid.

[default] = maximum allowable value for the Data Type

The value below which attribute Reading Valid is set to invalid.

[default] = minimum allowable value for the Data Type

default 0 → "Semantics"

Bit description: 0 Reading Invalid

(Logical Inversion of

Reading Valid)

1 Overrange Exceeded 2 Underrange Exceeded

5 Capacitance Diaphragm Gauge

tira40e1 (2005-04) BCG450SDv1.cp 23

2.4.2.6 Semantics of S-Analog Sensor Instance 3

Data Type

Value

→ Instance 1

An S-Analog Sensor object instance derives a reading from a physical analog sensor. The reading is converted to the data type and units specified for the Value attribute.

Using Counts and INT the following conversion has to be used:

(pressure) + k ] × 2000

= 12.5 = 12.624903 = 10.5

Safe State Safe Value

Sensor Alarm

Counts = [ log

where: k

k k

mbar Torr Pa

→ Instance 1 → Instance 1

16 Bits are used as sensor faults. Sensor Alarm Byte 0 is mapped to the Exception Detail Alarm 0, Sensor Alarm Byte 1 is mapped to the Exception Detail Alarm 1.

Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Sensor Alarm Byte 0

Sensor Alarm Byte 1

0000000Diaphragm

000000

Electronics

Failure

Sensor Warning

16 Bits are used as sensor warnings. Sensor Warning Byte 0 is mapped to the Exception Detail Warning 1, Sensor Warning Byte 1 is mapped to the Exception Detail Warning 2.

Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Sensor Warning Byte 0 Sensor Warning Byte 1

Status Extension

00000000

000000Electronics

Warning

8 Bits providing the current sensor alarm state of the instance

Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Sensor Alarm Byte 0

00000Underrange

Exceeded

Overrange

Exceeded

Reading

Invalid

24 tira40e1 (2005-04) BCG450SDv1.cp

2.4.2.7 Object-Specific Services

on Instance 3 / Capacitance

Diaphragm Gauge USER ATM Adjust

Service

Code

User ATM Adjust Service Data Field Parameters:

Parameter Datatype User ATM Adjust BOOL 0 = Unlock user ATM Adjust

There are no state transitions associated with the invocation of this service. It is therefore, incumbent upon the user to establish the device into the desired configuration prior to, and during the execution of this service. This will generally involve exposing the sensor to a known environment and treating the values read during execution of the services accordingly.

A success service response indicates that the service was accepted and the application process started.

To perform the User Atmosphere Adjust Request proceed as follows:

Service Name Description of Service

User Atmosphere

Adjust

Performs an Atmosphere Adjust Piezo to Capacitance Diaphragm Gauge

1 = executes an User ATM Adjust and lock

n Vent the gauge to atmosphere o Unlock the user ATM Adjust wit a target value of "0" p Execute the User Atmosphere Adjust Service with a target value of "1".

The pressure value of the amtmosphere pressure sensor is then tracked to the value of the Capacitance Diaphragm Gauge.

tira40e1 (2005-04) BCG450SDv1.cp 25

2.4.2.8 Instance Attributes of Instance 21 / Setpoint A (Instance 22 / Setpoint B)

AttributeIDAccess

Rule

3 Set / Con-

ditional:

→

Instance 1

NV/V Name DeviceNet

Description of Attribute Semantics of Values

Data Type

NV Data Type USINT Determines the Data Type

of Value and all related attributes as specified in this table.

4 Get NV Data Units UINT Determines the Units

context of Value and all related attributes.

5 Get V Reading

Valid

BOOL Indicates that the Value

attribute contains a valid value.

6 Get V Value INT or

specified by

Data Type

The value of the Setpoint A (Setpoint B) relay.

7 Get V Status BYTE Alarm and Warning State

of this object instance

100 NV Set Setpoint

Function

USINT Defines whether the relay

is controlled by the according potentiometer or by the atmosphere pressure sensor combined with the Capacitance Diaphragm Gauge pressure value.

101 NV Set Percentage

of Atmosphere

USINT If the pressure value

(active value) is within a "window" specified by this attribute from the atmosphere pressure sensor value, the relay will be activated. For further details → below.

→ "Semantics" section below. int C3 float CA

[default]

Supported Values: Counts 1001 mbar 1308 Torr 1301 Pascal 1309

[default]

h h h h

0 = invalid 1 = valid

→ "Semantics" section below. Behavior as Trip Point LOW 0 = Setpoint (default) 1 = Atmosphere Control

0 … 140 Example:

1 1% 50 50%

default value = 5%

102 V Get Atmosphere

reached

USINT If the pressure of the

gauge is within a percentage of the atmosphere pressure this byte has the value 1. If the pressure is below this window, the value is 0.

Atmospheric pressure threshold (→  28).

The upper pressure limit of the gauge is 1500 mbar. At an atmosphere pressure above 1000 mbar and a percentage of atmosphere of 150% the relay will never be activated.

If the device is in Safe State the value of this attribute is "0".

26 tira40e1 (2005-04) BCG450SDv1.cp

Status

A bit mapped byte which indicates the Alarm and Warning Exception status of the object instance. The following definition applies:

Bit Definition

0 High Alarm Exception: 0 = cleared 1 = set 1 Low Alarm Exception: 0 = cleared 1 = set 2 High Warning Exception: 0 = cleared 1 = set 3 Low Warning Exception: 0 = cleared 1 = set 4 Reserved 5 Reserved 6 Reserved 7 Reserved

Setpoints

If the pressure (attribute 6, instance 1 and 2) decreases below the Setpoint value (attribute 6, instance 21 and 22) an alarm or warning exception condition will be generated. The hysteresis is set to 10%.

For example: A Set Point value of 100 will result in an exception condition being set when the Value is below 100 and cleared when the Value increases above 110.

The setpoints can only be read by DeviceNet. It is not possible to set the values or to influence the state of the relays by DeviceNet. Even if the device is not allocated, the relay status is set corresponding to the voltage adjusted by the two setpoint potentiometers.

Only in case of a microcontroller RESET (for example reset on Identity Object), the relays will be reset too.

The setpoint is available in the actual pressure unit and data type. If the pressure unit "Counts" is set, use the following formula for the conversion from Counts to pressure:

mbar

where: k

=10

mbar

Torr

Counts / 2000 - k

= 12.5 = 12.624903 = 10.5

The relation between setpoint and voltage is:

mbar

where: c

=10

mbar

Torr

(U - 7.75) / 0.75 + c

=0 = -0.125 =2

The setpoints are only activated, if the pressure is below 100 mbar, therefore a setpoint above 100 mbar can not be realised.

tira40e1 (2005-04) BCG450SDv1.cp 27

Setpoint function "

Atmosphere Control"

The setpoint function "Atmosphere Control" is used to decide whether the measured pressure is within a specified percentage of the atmospheric pressure (→ diagram below).

Attribute 101 "Percentage of Atmosphere" is used to define the percentage of atmospheric pressure. If the measured pressure is within this window, the corresponding relay will be activated (→  [4]).

A fixed hysteresis of 2% of the atmospheric pressure threshold is programmed.

The following rule applies:

Atmospheric pressure × N

Atmospheric pressure threshold =

—————————————

100

Where: Atmospheric pres-

sure threshold

[mbar] : If the pressure inside the vacuum chamber rises

above this threshold, the relay "Atmosheric pressure reached" is energized.

Atmospheric

[mbar] : Atmospheric pressure (100%, ambient)

pressure N [%] : "Percentage of Atmosphere"

(1 … 140%, default value = 5%)

(Example values in the diagram below are printed in italic)

Measuring signal

(Pressure p)

1500 mbar

980 mbar

833 mbar

Upper limit of measuring range of gauge

Atmospheric pressure (100%, am bient)

"Percentage of Atmosphere"

(85%)

(Atmospheric pressure threshold)

816 mbar

Hysteresis

(2% of atmospheric pressure threshold)

Relay status "Atmospheric pressure rea c hed"

The (piezo) sensor measuring atmospheric pressure can be calibrated to the value of the Capacitance Diaphragm Gauge pressure (

→  25).

28 tira40e1 (2005-04) BCG450SDv1.cp

2.4.3 Common Services

The S-Analog Sensor Object provides the following Common Services:

2.4.4 Object-Specific Services on Instance 2 / Hot Cathode Ion Gauge

2.4.4.1 SET DEGAS STATE

Set Degas State Request Service Data Field parameters

Service

Service Name Description of Service

Code

0EhGet_Attribute_Single Returns the contents of the specified attribute. 10

Service

Set_Attribute_Single Modifies an attribute value.

Service Name Description of Service

Code

Set Degas State Activates/deactivates degas mode according to

the parameter Degas State. Degas mode may be terminated either automatically by device timeout (3 min) or remotely by this service.

Parameter Data Type Description Semantics of Values

Degas

State

BOOL

switches Degas OFF

0 1

switches Degas ON

The pressure has to be below 7.2×10-6 mbar before degas can be switched on.

2.4.4.2 SET EMISSION STATE

Set Emission State Request Service Data Field parameters

Service

Service Name Description of Service

Code

Set Emission

State

Turns the filament on and off according to the parameter Emission State

Parameter Data Type Description Semantics of Values

Emission

State

BOOL

→ below

emission OFF

0 1

emission ON

If the gauge is in the Emission User Mode "Manual", please note:

• The service SET EMISSION STATE ⇒ ON may be executed only, if

the pressure is below 2.4

-2

×10

mbar. If the pressure is higher, an

Object State Conflict error message will be returned.

• If the pressure rises above 3.2×10

-2

mbar, the gauge will switch off the emission automatically. The gauge will then show the Pirani value.

• If the gauge is measuring in the ion gauge measuring range and the

service Set Emission State switched off and the minimum Pirani value 1

⇒ OFF ist executed, the emission will be

-3

×10

mbar will be dis-

played.

tira40e1 (2005-04) BCG450SDv1.cp 29

2.4.4.3 Emission Control Mode

Service

Code

Service Name Description of Service

Set Emission Control Mode

• Automatic

The Emission is switched on and off by the Pirani automatically.

• Manual

The emission has to be switched on and off by the user

Set Emission Control Mode Data Field

Emission User Modes

2.4.5 Behavior

Parameter Data Type Description Semantics of Values

Emission

User Mode

BOOL

→ below

Automatic Mode (default)

0 1

Manual Mode

State

Automatic: The emission is automatically switched ON and OFF.

The user can switch the emission OFF by using the Set Emission State service. If the emission is switched off manually, the emission will be automatically switched on again, after the pressure rose above 3.2 and falls below 2.4

-2

×10

mbar again.

×10

-2

mbar

Manual: The emission has to be switched on and off by the user, using the Set

Emission State service. The Set Emission State service may be executed only, if the pressure is below 2.4

-2

×10

mbar. If the pressure

is higher, an Object State Conflict error will be returned.

If the emission is switched on and the pressure rises above 3.2

×10

-2

mbar, the

gauge will switch off the emission automatically.

Data Type

The following behavior with respect to Data Type applies: The Data Type value will be set automatically based upon the first valid I/O con-

nection established by the device. If no established I/O connections exist, which include an attribute from this object,

then the Data Type attribute is settable provided that the object is in the Idle State. The following example demonstrates this behavior:

A device specifies an instance of the S-Analog Sensor object as well as two static Assembly object instances, both with data attribute components mapped to this object instance. Assembly object instance ID 1 specifies INT data types and Assembly object instance ID 2 specifies REAL data types.

After the device is online, it is configured with an I/O connection to Assembly instance ID 2. When the connection transitions to the Established State, this object instance attribute Data Type is automatically set with the value for REAL before any data is communicated to, or from the object instance. Any subsequent attempt to connect to Assembly instance ID 1 would then be rejected and result in an INVALID ATTRIBUTE VALUE error with the additional error code indicating the ID of the offending attribute, which in this case would be the connection path.

30 tira40e1 (2005-04) BCG450SDv1.cp

3 I/O Assembly Object

3.1 I/O Assembly Instances

Class Code 04

A collection of assembly objects allows the sending of attributes from different application objects in one message (i.e. Polling I/O).

The following table identifies the I/O assembly instances supported by the gauge device.

Number Type Name

1 Input Pressure Value (Active Instance) 2 Input Exception Status and INT Pressure Value

(Active Instance) 4 Input REAL Pressure Value (Active Instance) 5 Input Exception Status and REAL Pressure Value

(Active Instance) 8 Input Exception Status 9 Input Active Instance, Active Pressure Value

10 Input Exception Status and Active Instance and INT Active

Pressure Value

12 Input Active Instance

REAL Active Pressure Value

13 Input Exception Status

Active Instance

REAL Active Pressure Value

tira40e1 (2005-04) BCG450SDv1.cp 31

3.2 I/O Assembly Object Instance Data Attribute Format

In order to maintain consistency, this device type will only allow connections to either INT or REAL based Assembly instances ( Once a valid connection is established, attempts to configure connections to a different type of Assembly instance will return an error.

The I/O Assembly DATA attribute has the format shown below:

Instance Type Byte Bit 0 … 7

1 Input 0 INT Pressure Value (low byte)

2 Input 0 Exception Status; Class 48, Instance 1,

Attribute 12 1 INT Pressure Value (low byte) 2 Class 49, Active Value

4 Input 0 REAL Pressure Value (low byte)

1 2 Class 49, Active Instance Value 3

5 Input 0 Exception Status Class 48, Instance 1,

Attribute 12 1 REAL Pressure Value (low byte) 2 Class 49, Active Instance Value 3 4

8 Input 0 Exception Status ; Class 48, Instance 1,

Attribute 12

9 0 Active Instance

1 2 INT Active Pressure Value 3

10 Input 0 Exception Status

1 Active Instance 2 3 INT Active Pressure Value 4

12 Input 0 Active Instance

1 2 REAL Pressure Value 3 4 5

13 Input 0 Exception Status

1 Active Instance 2 3 REAL Pressure Value 4 5 6

→ Data Type definition  18).

32 tira40e1 (2005-04) BCG450SDv1.cp

Appendix

A: Range of Values

B: Specific Codes

C: Conversion of a Floating

Number According to IEEE 754

General

Number received

1. Reverse the sequence of the HEX words

Integer int Unsigned integer uint

–32767 0

… 65535

… 32768

Float float according IEEE 754

Manufacturer product code 13 = BCG450-SD

AA BB CC DD

(4-Byte, floating format)

Legend: XX

Hexadecimal number

(Radix = 16) Decimal number (Radix = 10)

Binary number (Radix = 2)

2. Separate into bytes

3. Calculate

Converted number

SEEE EEEEbEMMM MMMMbMMMM MMMMbMMMM MMMM

Sign 8-Bit exponent 23-Bit mantissa

S EEEE EEEEbMMM MMMM MMMM MMMM MMMM MMMM

ØØ Ø

⎛

MMMMMMMMMMMMMMM MMMMMMMM

⎜ ⎜

⎝

= 1+

⎛

NNNNN

⎜

8388608

⎝

⎞

⎟ ⎠

Sign = Exponent = Mantissa =

-1

XYZ

Sign × 2

(Exponent-127)

RSTUV

× Mantissa

⎞ ⎟

⎟ ⎠

tira40e1 (2005-04) BCG450SDv1.cp 33

Example

Number received

1. Convert sequence of the HEX words

2. Separate into bytes

3. Calculate

00 00 CA 42h (4-Byte, floating format)

0100 0010

Sign 8-Bit exponent 23-Bit mantissa

0 1000 0101

1100 1010

0000 0000

100 1010 0000 0000 0000 0000

ØØ Ø

-1 1+

⎛ ⎜

⎜

⎜ ⎝

= 1+

⎛

4849664

⎜

8388608

⎝

0000 0000

⎞

0000 0000 0000 0000 1010 100

⎟

⎟ ⎠

⎞

⎟ ⎠

Converted number

D: Typical Start-Up

Procedure

Allocation process

ØØ

Sign = Exponent = Mantissa =

1 133 1.578125

(133-127)

1 × 2

The start up of a device is divided into the steps:

• Allocation process

• Setting of the EPR attribute

• Choice of the input and output assemblies

Send an allocation string as defined in the DeviceNet specification to the device you want to allocate.

Set the bits in the allocation choice byte to 1 for these connections you want to use.

× 1.578125 = 101

34 tira40e1 (2005-04) BCG450SDv1.cp

Example of the principal allocation process.

Master MAC ID....0

Allocation choice: Explicit, Poll, bit strobe, COS Slave address: 2

Allocated instances may not be valid for the BCG450-SD ⇒ Allocation String: 416 00 4B 03 01 57 00

Slave’s explicit/unconnected response message: 413 00 CB 00

Within the first allocation message the explicit connection has to be established.

The I/O connections bit strobe and COS/Cyclic are not supported by the BCG450-SD. Appendix D describes only the general allocation procedure for all devices (group 2 slave only).

Setting of the EPR Attribute (expected packet rate)

After the allocation, the device activates an INACTIVITY WATCHDOG TIMER. This timer has to be set for every single connection (connection object, attribute 9) which is allocated in the allocation choice byte. This attribute defaults to 2500 (2500 ms) within explicit messaging connections, and to zero within an I/O connection. If the INACTIVITY WATCHDOG TIMER expires, the established connection will be released. With every message the device receives, this timer is reloaded with the value specified in the according connection object, therefore it normally doesn't expire. The value zero deactivates the INACTIVITY WATCHDOG TIMER.

In this step the INACTIVITY WATCHDOG TIMER has to be set. In testing mode you could use the value 0 to deactivate the INACTIVITY WATCHDOG TIMER.

In the following you see the strings for setting the EPR attribute (addresses as specified above):

ID Message Body 414 00 10 05 01 09 00 00 set EPR of the explicit connection to zero 414 00 10 05 02 09 00 00 set EPR of the poll connection to zero 414 00 10 05 03 09 00 00 set EPR of the bit strobe connection to zero 414 00 10 05 04 09 00 00 set EPR of the COS/Cyclic connection to zero

The responses of the slave are:

ID Message Body 413 00 90 00 00 set EPR of the explicit connection to zero

Choice of the input and output assemblies

Reading the configured assemblies

tira40e1 (2005-04) BCG450SDv1.cp 35

You can specify which of the several input/output assemblies predefined in a device should be used for

Reading or setting of the input/output assemblies is possible only if the corresponding connection (polling, change of state, bit strobe) has been allocated in the Allocation Message.

If you want to read the number of the chosen assembly, you must read the attributes 14 and 16 in the corresponding Instance of the Connection Object (Object ID 5).

For reading this value, the connection has to be established. The EPR attribute may be set.

Instance 2: Polling Instance 3: Bit Strobe Instance 4: Change of State/Cyclic

every single connection.

Setting of assemblies

If you want to set the number of the chosen assembly, you have to set the attributes 14 and 16 in the corresponding instance of the connection object.

To set this value, the connection has to be allocated, but the EPR attribute has not to be set to any value.

Examples

• Read a configured assembly (addresses as specified above): Get single request:

ID Message Body

414 00 0E 05 02 0E get produced connection path (Request

for input assembly by master).

Get single response:

ID Message Body

413 00 8E 20 04 24 05 30 03 response from slave

The addressing format of the attribute values differs from the normal mode. A connection path attribute that specifies class 4, Instance 5, and attribute ID 3 is illustrated below:

Class #4 Instance #5 Attribute #3

20 04 24 05 30 03

The instance defines the assembly you want to use. This format has to be used by the master in the request and is used by the slave in the response.

• Set the input assembly 04 for a Poll Connection (addresses as specified above):

Set single request:

ID Message Body 414 80 00 10 05 02 10 20 04 first fragment 414 80 81 24 04 30 03 second fragment

Because the message body is longer than 8 bytes, the fragmented protocol has to be used.

Set single response:

ID Message Body 413 80 C0 00 response on first fragment 413 80 C1 00 response on second fragment

36 tira40e1 (2005-04) BCG450SDv1.cp

E: Literature

 [1] www.inficon.com

Product descriptions and downloads INFICON AG, LI–9496 Balzers, Liechtenstein

 [2] www.odva.org

Open DeviceNet Vendor Association, Inc. DeviceNet™ Specifications

 [3] European Standard for DeviceNet EN 50325  [4] www.inficon.com

Operating Instructions BCG450, BCG450-SD, BCG450-SP tina40d1 / tina40e1 INFICON AG, LI–9496 Balzers, Liechtenstein

 [5] www.inficon.com

Instruction Sheet BCG450, BCG450-SD, BCG450-SP tima40d1 / tima40e1 INFICON AG, LI–9496 Balzers, Liechtenstein

 [6] www.inficon.com

Instruction Sheet BCG450-SD, BCG450-SP tima41d1 / tima41e1 INFICON AG, LI–9496 Balzers, Liechtenstein

tira40e1 (2005-04) BCG450SDv1.cp 37

Notes

38 tira40e1 (2005-04) BCG450SDv1.cp

Notes

tira40e1 (2005-04) BCG450SDv1.cp 39

LI–9496 Balzers Liechtenstein Tel +423 / 388 3111 Fax +423 / 388 3700 reachus@inficon.com

t i ra40 e1

www.inficon.com

INFICON BCG450-SD ATM User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual