Mitsubishi Electric MELSEC-Q Series Programming Manual page 106

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
• When X1 switches ON, the following program switches the Sn or TRn block number to the block number stored at the D0
data register.
• When X2 switches ON, the following program switches the Sn or TRn block number according to the constant at the Z1
index register.
4 SFC PROGRAM CONFIGURATION
104
4.4 Controlling SFC Programs by Instructions (SFC Control Instructions)