Chapter 8 Logic Instructions
8-265
Output Update Timing
Parameter Name Timing for changing to TRUE Timing for changing to FALSE
Valid
FALSE to TRUE
TRUE to FALSE.
RS232_Link_Error
When an error occurs in
communication as Enable
TRUE.
The communication is restored
to normal. (Error is FALSE.)
When Enable
TRUE to FALSE.
When Open
RS232_Link_Manage
changes from TRUE to FALSE.
(Error is FALSE.)
Error
When an error occurs in the
instruction inputs as Enable
TRUE.
When Enable changes from
TRUE to FALSE.
When
value is filled.
Output Update Timing Chart
Enable
Valid
RS232_Link_Error
Error
Case 1 Case 4
Case 2 Case 3
ErrorID
Case 1： When Enable changes from FALSE to TRUE, Valid changes from FALSE to TRUE. (There is no
error both in the communication and instruction inputs.)
Case 2： If there is an error in the communication, as Enable changes from FALSE to TRUE, Valid
changes from FALSE to TRUE and after a while, RS232_Link_Error changes to TRUE.
Case 3： If there is an error in the instruction inputs, as Enable changes from FALSE to TRUE, Valid
changes from FALSE to TRUE and Error changes to TRUE.
Case 4： If there is an error both in the communication and in the instruction inputs, as Enable changes
from FALSE to TRUE, Valid changes from FALSE to TRUE, Error changes to TRUE and
RS232_Link_Error is still FALSE. After the input parameter values are modified correctly, Error
changes to FALSE and after a while, RS232_Link_Error changes to TRUE. When the input
parameter error occurs again, Error changes to TRUE. At the moment, there will be no change
in RS232_Link_Error no matter whether the communication works normally. When Enable is
TRUE and Error is TRUE, the state of RS232_Link_Error will not be refreshed and will be invalid.
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