12 - 25 12 - 25
MELSEC
12 APPLICATION FUNCTIONS
12.4 Multiplex Transmission Function (Optical Loop System)
The multiplex transmission function allows high-speed communications using duplex
transmission paths (both the forward and reverse loops) in the optical loop system.
In order to execute the multiplex transmission function, setting for the "Supplementary
settings" of the common parameters is required. Note that this setting is not allowed
unless the total number of link stations is four stations or more.
(1) Using the multiplex transmission function, the high-speed communication is
performed using both the forward and reverse loops effectively.
1M
P
1
1N
S
6
1N
S
2
1N
S
5
1N
S
3
1N
S
4
Forward loop
Reverse loop
IN
OUT
IN
OUT
IN
OUT
OUT
IN
OUT
IN
OUT
IN
(2) If an error occurs in the transmission path while the multiplex transmission
function is used, data linking continues by communicating only using the
transmission path on one side of either the forward or reverse loop, or by
switching to the communication using loopback. The transmission speed in this
case is 10 Mbps or 25 Mbps.
1M
P
1
1N
S
6
1N
S
2
1N
S
5
1N
S
3
1N
S
4
Forward loop
Reverse loop
Loopback
Down
Loopback
IN
OUT
OUT
IN
IN
OUT
OUT
IN
IN
OUT
OUT
IN
REMARK
The multiplex transmission function is effective only in reducing the link scan time
when the number of connected stations is 16 or more and the link devices assigned
with common parameters is 2,048 bytes or more. The link scan time will be 1.1 to
1.3 times faster compared to when the multiplex transmission function is not used.
Summary of Contents for Q80BD-J71BR11
Page 2: ......
Page 24: ...A 22 A 22 MEMO ...
Page 50: ...4 6 4 6 MELSEC 4 FUNCTION MEMO ...
Page 92: ...6 36 6 36 MELSEC 6 PROCEDURE AND SETTINGS UP TO THE POINT OF OPERATION MEMO ...
Page 132: ...10 2 10 2 MELSEC 10 MELSEC DATA LINK LIBRARY MEMO 10 ...
Page 138: ...11 6 11 6 MELSEC 11 PROGRAMMING MEMO ...
Page 164: ...12 26 12 26 MELSEC 12 APPLICATION FUNCTIONS MEMO ...
Page 166: ...13 2 13 2 MELSEC 13 ERROR CODE MEMO 13 ...
Page 223: ......
