Mitsubishi Electric MELSEC-Q Series Programming Manual page 96

Operation Error
Error code Description
4621 When the specified block does not exist or when the SFC program is in the stand-by status
Program Examples
• Block 1 is stopped when X1 switches ON, and is restarted when X2 switches ON.
■Related Instructions
SFC information device
• Block STOP/RESTART bit (Refer to  Page 110 Block STOP/RESTART bit.)
4 SFC PROGRAM CONFIGURATION
94
4.4 Controlling SFC Programs by Instructions (SFC Control Instructions)