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<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
Identifies a fieldbus 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