<Appendix 4. Link Master Functions>
266
IM 01E21A02-03EN
Appendix 4. Link Master Functions
A4.1 Link Active Scheduler (LAS)
Alinkactivescheduler(LAS)isadevicetoperformthenetworkcontrolfunctionforFieldbus.
Fieldbus always needs one LAS on the link.
This product supports the following LAS functions.
1
PN transmission
function
Identiesaeldbusdevicenewlyconnectedtothebus.*PN(ProbeNode)
2
PT transmission
function
Passesatokentoadeviceonthelink.*PT(PassToken)
3
CD transmission
function
Starts up a scheduled transmission to a device on the link.
*CD(CompleData)
4
Time
synchronization
function
Periodically transmits the time information to the link. Also, returns the time
information in response to a request from a device.
5
Live list equalization
function
Sends the live list information to the link master device on the link.
6
LAS transfer
function
Function to transfer the right to be the LAS to another link master device.
A4.2 Link Master (LM)
AnydeviceshavingthefunctionasLASarecalledalinkmaster(LM).Thoughtheremustbe
alwaysoneLASonthelink,therecanbemultipleLMdevices.(FigureA4.1)
When the LAS stops working, another LM device on the link starts functioning as the LAS.
LM
Node address:
0x15
SlotTime = 5
LM
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.
LM
FA0401.EPS
Figure A4.1 LM Device and Basic Device
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