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9-2
(2) Register link
Mainly used for sending and receiving numerical data.
[Example] In the case of sending 1 byte data from a master station and slave station 01 and 02.
Register
Register
Register
Register
Register
Register
- The register link of the sending station may be used as D (Destination) side of the application
instruction of the PC program.
- The register link of the receiving station may be used as S (Source) side of the application
instruction of the PC program.
[2] Data link (Save memory function)
The save memory function is to provide a part of the data link area in the slave station data memory as
a receiving area. A slave station can receive only the required area by relay link/register link so that the
slave stations can save on use of the memory area.
As this function can unify the receiving area address and the sending area address of each slave
station, the same program can be used for each slave station. Mixed allocation of the addresses with
the data link (standard function) is also possible.
- Top address of receiving area in a slave station shall be set by the number of offset bytes from
the link area's top. (0 £ Number of offset bytes £ total number of bytes of link area)
* When JW-21MNs without 30Hn mark and 30H mark are used, these cannot set each slave
station.
Automatically allocated with the same number of the sending bytes of the slave station.
Master station 00
Send
Receive
Number of offset bytes of
slave station "n"
Top address of slave station
"n" link area
Number of sending bytes
of slave station "n"
Top address of
slave station
"n" link area
Slave station "n" (JW-21MN: Set to save memory function)
Addresses are allocated as
receiving and sending alternately
Memory inside
control module
Memory inside
JW-21MN
V2
Number of sending
bytes of slave
station "n"
Available setting
each slave station
*
Top address of
master station
link area
Number of
sending bytes of
the master station
Receiving area
from slave station
1 to (n to 1)
Receiving area
from slave station
"n"
Top address of master station link area
Number of sending bytes of the master station
Number of offset bytes of slave station
Number of sending bytes of the slave station
Top address of slave station link area
Number of receiving bytes of slave station
V2
*
Master station’s parameter
Set location
Setting item
Module No. switch of slave station
Slave station's parameter