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6 SAFETY FUNCTION BLOCK
MELSOFT
6 SAFETY FUNCTION BLOCK
The safety function block represents safety control logic in function block for easier
creation of a safety program.
The safety function has the following features.
(1) Creating safety program easily
Basic safety ladders are provided as safety function blocks.
Using safety function blocks can create safety programs easily and surely.
(2) Developing and maintaining safety programs easily
The number of steps in user-created programs is reduced with the use of safety
function blocks, resulting in the reduction of development man-hours and the
improvement of readable and maintenance performance of the program.
(3) Ensuring safety of safety program
Users cannot change the program using safety function blocks of safety-
approved.
Therefore, the safety is not blocked due to careless program change.
(4) Shortening the time for safety review of user-created programs
As for safety review of user-created programs, preapproved safety function
block programs are not subject to safety review.
Using safety function blocks can shorten the man-hours and time required for
safety review.
POINT
• Version 1 of safety function block can be used with GX Developer Version 8.58L
(SW8D5C-GPPW-E) or later.
• Version 2 of safety function block can be used when GX Developer Version 8.82L
(SW8D5C-GPPW-E) or later and the QS001CPU having a serial number (first five
digits) of "11042" or later are used together.
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