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R-IN32 Series CC-Link Remote device station
14.3
Protocol and Others
(1) Questions and Answers Related to Errors
Question
1
What is the exact definition of
"disconnection"?
2
On what should we base our assessment of a
"disconnection" state?
3
We know that there are timeout errors, but
what is the definition of the timeout error?
4
What is the definition of "temporary error
invalid stations"?
5
Is the log of each station saved when a
communication error occurs?
How about the number of retries?
6
Is it possible to receive the next request
(command) when the error status flag
RX(m+n)A is ON?
7
What happens if the error reset request flag
RY(m+n)A is turned on when an error state
continuously occurs?
8
When an error state continues or multiple
errors occur, can we set remote station
READY RX(m+n)B to ON using the error reset
request RY(m+n)A?
R18UZ0056EJ0102
Dec. 28, 2018
It means that a data link error occurs and a station is disconnected
from the data link. Automatic return means that the data link is
restarted automatically when problems are solved.
A timeout error.
It occurs when the time from the completion of refresh normal
reception to the time of normal reception of the next refresh
exceeds the specified value.
By specifying some of the link status special relays (SB) and link
special registers (SW) of the master station as temporary error invalid
stations, it is possible to exclude the stations specified as temporary
error invalid stations from being detected as stations in the error
status, even if they are down. By using this function, it is possible to
replace modules without causing link errors (the power to the
modules to be replaced must be turned off).
The specification of temporary error invalid stations does not
require parameters; it can be changed online.
If any temporary error invalid stations are down (the power is
turned off), the outputs from the master station are turned off while
the inputs are maintained; it is possible to replace them while
displaying the information before the shutdown.
The information log of each station is not saved when a
communication error occurs. The real time information of each station
is written to the link special register (SW), but it simply indicates the bit
status and is cleared when the error is canceled and the station
recovers and returns to the system. To leave the information in the
log, it is necessary to save it with a program on the master station
side every time the status changes. The number of retries is saved for
the entire network but there is no information for each station.
Yes, it is possible. Execute the request (command).
The error reset request flag is always executable. When executed
in such a state, the error status flag turns OFF, but then turns ON
again since the request (command) to generate an error
continues.
Turn remote station Ready ON after clearing all error conditions
(states), unless a deadlock is to occur for the operation
convenience of the developed device. Clearly describe the
operation at this time in the user's manual.
14. Questions & Answers
Answer
Page 81 of 83
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