YOKOGAWA F3LR02-0N, User Manual

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B6-4
IM 34M06H45-01E 7th Edition : Aug.30, 2019-00
B6.1.5 Transmission Channel Loop-back Function
When a transmission channel error occurs in a daisy-chain configuration, the channel
loop-back function automatically isolates the inaccessible substation and continues
system operation. To enable this function, setup the system to continue operation in the
event of a transmission channel error. Alternatively, you can setup to stop system
operation in the event of a transmission channel error.
When a transmission channel error occurs in a daisy-chain configuration, the loop-back
function automatically cuts off the unreachable stations so that the station immediately
preceding the point of discontinuity now becomes the terminal station and
communications can continue. For this function to work properly, the cables must be
correctly connected.
×
×
ERR2 LED lit;
Loop back
ERR1 LED lit
Cable
discontinuity
u1-s1 u2-s1 u3-s1
Master
station
Substation 1 Terminal station
Loopback
FB0612.VSD
Port 1 Port 2
Substation 2
Figure B6.2 Transmission Channel Loop-back Function
To enable the transmission channel loop-back function, perform the following setup.
[Operation Control]
in the CPU Module’s Configuration
Condition Switches
of the F3LR02
I/O Module Error
Subunit
Communication Error
SW1 SW3
Run Run (default) OFF
OFF
(default)
See Also B6.3.3 B6.3.3 B4.2.3 B4.2.5