Chapter 8 High Speed Link Service
67
8.3 HS Link Flag
HS link service exchanges between over 2 stations of communication modules. To verify the reliability of read data from
destination station through HS link, HS link service provides HS link information to user.
Communication module provides HS link information synthesizing receiving data by the time every some general interval
And it verifies if the HS link operates in good condition followed by the user’s assigned parameter.
HS link service is composed of followings.
(1) Run- Link (_HSxRLINK): It shows communication network overall information,
(2) Overall information of Link-Trouble (_HSxLTRBL)
(3) _HSxSTATE, _HSxTRX, _HSxMOD, _HSxERR: Individual information. It shows each communication status by 64 registered
item in parameter
User can use upper information in Key word type for programming. And by using HS information monitor function, user
can monitor the status of HS link. Operating many PLCs by using HS link, user should do the operation after verifying the
reliability of Send/Receive data with understanding Run-Link, Link-Trouble, etc. [Table 8-13] shows HS link information
function and definition.
8.3.1 HS link flag classification
Classification
Run-Link
Link-Trouble
Send/Receive
status
Operation
Mode
Error
HS link status
Information
type Overall Overall Individual Individual Individual Individual
Keyword name
(x=HS Link No.)
_HSxRLINK _HSxLTRBL
_HSxTRX[n]
(n=0..64)
_HSxMOD[n]
(n=0..64)
_HSxERR[n]
(n=0..64)
_HSxSTATE[n]
(n=0..64)
Data type
Bit
Bit
Bit-Array
Bit-Array
Bit-Array
Bit-Array
Monitor
availability
Yes Yes Yes Yes Yes Yes
Program
usability
Yes Yes Yes Yes Yes Yes
[Fig. 8-13] HS link flag
8.3.2 HS link flag introduction
(1) Run-Link Flag
Overall information, it shows if HS link operates in good condition by the user’s assigned parameter.
It keeps ‘On’ by the time of permitting ‘Off’ when it is ‘On’ once, and it is ’On’ under following conditions.
(a) When the permitting link is On’.
(b) When all parameter registration item setting is normal.
(c) When every data which is included in parameter registration item Send/Receive as the setting period.
(d) Status of every setting destination station in parameter is RUN and at the moment there’s no error.
(2) Trouble-Link Flag
(a) It shows if HS link operates in good condition by the user’s assigned parameter.
(b) In the status of ‘On’ of Run-Link, if Run-Link is out of ‘On’ condition, it becomes ‘On’ and it does ‘Off’ when it
recovers.