Yokogawa DO202 2-Wire Dissolved Oxygen Analyzer Bedienungsanleitung PDF herunterladen (Seite 79)

APPENDIX 1. LINK MASTER FUNCTIONS 5-1

IM 12A00A01-61E

APPENDIX 1. LINK MASTER FUNCTIONS

A1-1 Link Active Scheduler

A link active scheduler (LAS) is a deterministic, centralized bus scheduler that can control communications

on an H1 fieldbus segment. There is only one LAS on an H1 fieldbus segment.

A EXA202 supports the following LAS functions.

• PN transmission: Identifies a fieldbus device newly connected to the same fieldbus segment. PN is short

for Probe Node.

• PT transmission: Passes a token governing the right to transmit, to a fieldbus device on the same

segment. PT is short for Pass Token.

• CD transmission: Carry out a scheduled transmission to a fieldbus device on the same segment. CD is

short for Compel Data.

• Time synchronization: Periodically transmits the time data to all fieldbus devices on the segment and

returns the time data in response to a request from a device.

• Live list equalization: Sends the live list data to link masters on the same segment.

• LAS transfer: Transfers the right to be the LAS on the segment to another link master.

A1-2 Link Master

A link master (LM) is any device containing a link active scheduler. There must be at least one LM on a

segment. When the LAS on a segment has failed, another LM on the same segment starts working as the

LAS.

Node address:

0x15

SlotTime = 5

Node address:

0x16

SlotTime = 5

Node address: 0x14

SlotTime = 5

Basic device

Node address:

0xF1

Basic device

Node address:

0xF2

Basic device

Node address:

0xF3

Basic device

Node address:

0xF4

LAS

There are 3 LMs on this segment.

Figure A1-1. Example of Fieldbus configuration-3 LMs on Same Segment

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 89 90

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