Parameter Declaration Data type Memory area DescriptionDT1* INPUT DATE_AND_TIME D, L Input variable in format TDDT2* INPUT DATE_AND_TIME D, L Input variable in format TDRET_VAL* OUTPUT BOOL I, Q, M, D, L Comparison result*) You can assign only a symbolically defined variable for the parameter.15.2.20 FC 19 - LE_STRNG - Compare STRING for smaller then or equalThe function FC 19 compares the contents of two variables in the format STRING todetermine if one is smaller or equal to the other and outputs the result of the comparisonas a return value. The return value has the signal state "1" if the string at parameter S1 issmaller than or equal to the string at parameter S2. The characters are compared by theirASCII code (e.g. 'A' smaller than 'a'), starting from the left. The first character to be dif-ferent decides the result of the comparison. If the left part of the longer character stringand the shorter character string are the same, the shorter string is smaller. The functiondoes not report any errors.Parameter Declaration Data type Memory area DescriptionS1* INPUT STRING D, L Input variable in format STRINGS2* INPUT STRING D, L Input variable in format STRINGRET_VAL OUTPUT BOOL I, Q, M, D, L Comparison result*) You can assign only a symbolically defined variable for the parameter.15.2.21 FC 20 - LEFT - Left part of a STRING variableThe function FC 20 provides the first L characters of a string.n If L is greater than the current length of the STRING variable, the input value isreturned.n With L = 0 and with a blank string as the input value, a blank string is returned.n If L is negative, a blank string is returned and the BR bit of the status word is set to"0".Parameter Declaration Data type Memory area DescriptionIN* INPUT STRING D, L Input variable in format STRINGL INPUT INT I, Q, M, D, LConstantLength of the left character stringRET_VAL* OUTPUT STRING D, L Output variable in format STRING*) You can assign only a symbolically defined variable for the parameter.DescriptionParameterDescriptionParameterVIPA SPEED7StandardIEC > FC 20 - LEFT - Left part of a STRING variableHB00 | OPL_SP7 | Operation list | en | 18-30812
