Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 188

Operation error
Error code Description
(SD0)
3400H An invalid operation (such as division by zero) is performed.
3402H Input data (PVP) or operation constant (TRK, SVPTN_B0, SVPTN_B1) is a subnormal number or NaN (not a number).
3403H An overflow has occurred.
3405H The control cycle (CT) setting is less than 0.
The execution cycle (T) setting is less than 0.
The value divided the control cycle (CT) by the execution cycle (T) exceeds 32767.
10 LOOP CONTROL OPERATION
186
10.1 Ratio Control (Enable Tracking for primary loop) (M+P_R_T)