Mitsubishi Electric 800 Series Instruction Manual page 28

 SSM output retention time (Pr.S021)
• The SSMS signal status immediately before the STO function is activated is retained for the time period set in Pr.S021.
NOTE
• The SSM output is not retained when the output is shutoff by the protective function or a function other than the STO
function (for example, MRS signal input).
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5. Safety Sub-Functions
5.4 SSM function
Actual motor speed
Output frequency
Pr.S019
SSM output
(SSMS)
STO output
ON
(STOS)
Pr.S020
Time
ON
Pr.S021
STO state