Numeric (IEC) | |||
Inputs/Outputs | Operands | Data Types | |
IN | VD, ID, QD, MD, SMD, SD, LD, AC, Constant, *VD, *AC, *LD | REAL | |
OUT | VD, ID, QD, MD, SMD, SD, LD, AC, *VD, *AC, *LD | REAL |
Memory Ranges | ENO | Errors | Instruction Support for S7-200 CPUs | SIMATIC/International Mnemonics | ||
The Natural Logarithm instruction performs the natural logarithm of the value in IN and places the result in OUT. To obtain the base 10 logarithm from the natural logarithm, divide the natural logarithm by 2.302585 (approximately the natural log of 10).
Error Conditions that Set ENO = 0: SM1.1 (overflow), SM4.3 (run-time), 0006 (indirect address) This instruction affects the following Special Memory bits: SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative) |