Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 115

Operation error
Error code Description
(SD0)
3400H An invalid operation (such as division by zero) is performed.
3402H Input data (INVLD, IN), output data (OUT_), or operation constant (T1_, T2_) is a subnormal number or NaN (not a number).
3403H An overflow has occurred.
3405H The lag time (T1) is less than 0 or lead time (T2) is less than 0.
The execution cycle (T) setting is less than 0.
8 CONTROL OPERATION
8.1 Lead-Lag (M+P_LLAG)
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