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MELSEC-QnA
15 FUNCTIONS (FUNCTION VERSION B OR LATER)
15.9 Temporary Error Invalid Station Specification Function
Replacement of modules can be performed online without detecting an error of the
corresponding remote station.
15.9.1 I/O status of the temporary error invalid station specification
All of the cyclic transmission data of the station specified as a temporary error invalid
station will be refreshed.
When the station specified as a temporary error invalid station becomes faulty, input is
retained and output is turned off.
15.9.2 Link special relays/registers (SB, SW) relating to the temporary error invalid station
specification function
The link special relays and link special registers relating to the temporary error invalid
station specification function are explained.
They are stored in the buffer memory.
(1) Link special relays (SB)
The link special relays (SB) relating to the temporary error invalid station
specification function are as follows.
The figures in parentheses in the number column indicate buffer memory
address and bit location.
Example: When buffer memory address is 5E0
H and bit is 0: (5E0H, b0)
Table 15.9 List of link special relays relating to the temporary error invalid station specification function
Availability
(
: available, : not available)
Number Name Description
Master station Local station
SB0004
(5E0
H, b4)
Temporary error invalid
station request
Confirms the station which had been specified by SW0003 to
SW0007 to temporary error invalid station.
OFF : No request
ON : Request
SB0005
(5E0
H, b5)
Temporary error invalid
station cancelling request
Cancels the station which had been specified by SW0003 to
SW0007 from temporary error invalid station.
OFF : No request
ON : Request
SB0048
(5E4
H, b8)
Temporary error invalid
station acceptance status
Indicates the acceptance status of the temporary error invalid
station request instruction.
OFF : Not executed
ON : Instruction accepted
SB0049
(5E4
H, b9)
Temporary error invalid
station complete status
Indicates the acceptance complete status of the temporary
error invalid station request instruction.
OFF : Not executed
ON : Temporary error invalid station confirmed
SB004A
(5E4
H, b10)
Temporary error invalid
station cancelling
acceptance status
Indicates the acceptance status of the temporary error invalid
station cancelling request instruction.
OFF : Not executed
ON : Instruction accepted
SB004B
(5E4
H, b11)
Temporary error invalid
station cancelling
complete status
Indicates the acceptance complete status of the temporary
error invalid station cancelling request instruction.
OFF : Not executed
ON : Temporary error invalid station cancelling complete