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31 RUNNING A SAFETY PROGRAM
31.2 Safety Program
525
31
31.2
Safety Program
Safety programs are executed at every safety cycle. Safety cycle processing is performed in the following order: safety input
(refresh), safety program, and safety output (refresh). (
Standard programs (+ END processing) are executed within the remaining time of the safety cycle time after safety programs
are executed. (Standard programs are executed until next safety cycle time starts.)
• After executing a rising/falling instruction, this will be valid until the safety program for the next safety cycle
processing is executed. (
MELSEC iQ-R Programming Manual (CPU Module Instructions, Standard
Functions/Function Blocks))
• In safety programs, the block number of the file register (R) is not saved or restored. Data in the index
register (Z, LZ) are not saved or restored, either.
• Even if the operating status of Safety CPUs for which no safety program has been registered is STOP or
PAUSE, safety program operations other than operation processing are performed. Consequently, the
standard control processing time and device/label access service processing time will be longer.
Tsc: Safety cycle time
Tsio: Safety p Safety input/output processing time
(1): Store the processing times below.
• Safety CPU: SD1890, SD1891
• Safety function module: Un\G62, Un\G63
(2): Execute all safety programs. (Execute safety programs A, B, and C.)
END
A
B
C
A
B
C
A
B
C
Tsc
(1)
(2)
Tsc
Tsio
Tsio
Tsio
Safety input
(input refresh)
Safety program
(operation
processing)
Safety output
(output refresh)
Standard program
Содержание MELSEC iQ-R-R00CPU
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Страница 151: ...9 MONITOR FUNCTION 9 1 Real Time Monitor Function 149 9 MEMO ...
Страница 323: ...18 SEQUENCE SCAN SYNCHRONIZATION SAMPLING FUNCTION 321 18 MEMO ...
Страница 330: ...328 20 ROUTING SETTING 20 3 Precautions MEMO ...
Страница 423: ...26 BASIC CONCEPT 26 8 State Transition of the Redundant System 421 26 MEMO ...
Страница 524: ...522 30 MAINTENANCE AND INSPECTION FOR A REDUNDANT SYSTEM 30 1 Module Replacement in the Redundant System MEMO ...
Страница 1009: ...APPX Appendix 14 List of Available SQL Commands for CPU Module Database Access Function 1007 A MEMO ...
Страница 1014: ...1012 APPX Appendix 15 Added and Enhanced Functions MEMO ...
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