IEC 61158-6-20:2007
(Main)Industrial communication networks - Fieldbus specifications - Part 6-20: Application layer protocol specification - Type 20 elements
Industrial communication networks - Fieldbus specifications - Part 6-20: Application layer protocol specification - Type 20 elements
It provides user programs with a means to access the fieldbus communication environment. In this respect, the FAL can be viewed as a "window between corresponding application programs." This standard provides common elements for basic time-critical and non-time-critical messaging communications between application programs in an automation environment and material specific to Type 2 fieldbus. The term "time-critical" is used to represent the presence of a time-window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life. It includes the following significant changes from the previous edition deletion of the former Type 6 fieldbus for lack of market relevance; addition of new types of fieldbuses; partition of part 6 of the third edition into multiple parts numbered.
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IEC 61158-6-20
Edition 1.0 2007-12
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 6-20: Application layer protocol specification – Type 20 elements
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IEC 61158-6-20
Edition 1.0 2007-12
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 6-20: Application layer protocol specification – Type 20 elements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XA
ICS 35.100.70; 25.040.40 ISBN 2-8318-9500-6
– 2 – 61158-6-20 © IEC:2007(E)
CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope.8
1.1 General .8
1.2 Specifications .8
1.3 Conformance.8
2 Normative references .9
3 Terms, definitions, symbols, abbreviations and conventions .10
3.1 Terms and definitions from other ISO/IEC standards .10
3.2 IEC/TR 61158-1 terms.10
3.3 Type 20 fieldbus application-layer specific definitions.13
3.4 Abbreviations and symbols .15
3.5 Conventions .16
3.6 Conventions used in state machines.16
4 Abstract syntax.17
5 Transfer syntax.17
5.1 General .17
5.2 Common APDU structure.18
5.3 Service-specific APDU structures .20
5.4 Data coding rules .35
6 Structure of FAL protocol state machines .40
7 AP-context state machines .41
8 FAL service protocol machine (FSPM) .41
8.1 General .41
8.2 FSPM state tables .42
8.3 Functions used by FSPM.47
8.4 Parameters of FSPM/ARPM primitives.47
9 Application relationship protocol machines (ARPMs) .48
9.1 AREP mapping to data link layer .48
9.2 Application relationship protocol machines (ARPMs) .49
9.3 AREP state machine primitive definitions.51
9.4 AREP state machine functions.51
10 DLL mapping protocol machine (DMPM) .51
10.1 DMPM states.51
10.2 DMPM state machines.52
10.3 Primitives exchanged between data link layer and DMPM.52
10.4 Functions used by DMPM .53
Bibliography.54
Figure 1 – APDU format.18
Figure 2 – Normal response from slave to master .18
Figure 3 – Command error response from slave to master .19
Figure 4 – Communication error response from slave to master .20
Figure 5 – Coding without identification.35
Figure 6 – Coding of Integer type data .35
61158-6-20 © IEC:2007(E) – 3 –
Figure 7 – Coding of Integer16 type data .36
Figure 8 – Coding of Unsigned type data .36
Figure 9 – Coding of Unsigned16 type data.36
Figure 10 – Coding of single precision Floating Point type data .36
Figure 11 – Coding of double precision Floating Point type data .37
Figure 12 – Coding of Date type data.37
Figure 13 – Relationships among protocol machines and adjacent layers .41
Figure 14 – State transition diagram of FSPM .42
Figure 15 – State transition diagram of the client ARPM .49
Figure 16 – State transition diagram of the server ARPM .50
Figure 17 – State transition diagram of DMPM .52
Table 1 – Conventions used for state machines .16
Table 2 – Response code values .19
Table 3 – Device status values .19
Table 4 – Response code values .20
Table 5 – Communication error codes.20
Table 6 – Identify request APDU .21
Table 7 – Identify response value field .22
Table 8 – Identify command specific response codes.22
Table 9 – Read primary variable response value field .23
Table 10 – Read primary variable command specific response codes .23
Table 11 – Read loop current and percent of range value field.23
Table 12 – Read loop current and percent of range command specific response codes .24
Table 13 – Read dynamic variables and loop current value field .24
Table 14 – Read dynamic variables and loop current command specific response
codes.24
Table 15 – Write polling address value field .25
Table 16 – Loop current mode codes .25
Table 17 – Write polling address command specific response codes.25
Table 18 – Read loop configuration value field.26
Table 19 – Read loop configuration command specific response codes .26
Table 20 – Read dynamic variable families classifications value field.26
Table 21 – Read dynamic variable families classifications command specific response
codes.27
Table 22 – Read device variables with status request value field .27
Table 23 – Read device variables with status command specific response codes.27
Table 24 – Read device variables with status value field.28
Table 25 – Variable status values .28
Table 26 – Read message response value field .29
Table 27 – Read message command specific response codes .29
Table 28 – Read tag, descriptor, date response value field .30
Table 29 – Read tag, descriptor, date command specific response codes .30
Table 30 – Read primary variable transducer information response value field.30
– 4 – 61158-6-20 © IEC:2007(E)
Table 31 – Read primary variable transducer information command specific response
codes.31
Table 32 – Read device information response value field.31
Table 33 – Read device information command specific response codes.32
Table 34 – Read final assembly number response value field .32
Table 35 – Read final assembly number command specific response codes .32
Table 36 – Write message value field.32
Table 37 – Write message command specific response codes .33
Table 38 – Write tag, descriptor, date value field .33
Table 39 – Write tag, descriptor, date command specific response codes .33
Table 40 – Write final assembly number value field.34
Table 41 – Write final assembly number command specific response codes .34
Table 42 – Read long tag response value field.34
Table 43 – Read long tag command-specific response codes .
...
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