Ln function, Log_event function, Ln( a ) – Delta RMC151 User Manual
Page 373: Log_event( a, ... )
5 Programming
LOG(a)
Returns the logarithm (base 10) of a.
Parameters
a (REAL)
The input value.
Return Value
Returns a REAL.
Remarks
If a is less than zero, the task will fault. An error will be logged in the Event Log and the
user program running on the task will stop.
Examples
LOG(1000.0) returns 3.0.
LOG(15.0) returns 1.1760913.
5.14.2.25. LN Function
LN(a)
Returns the natural logarithm (base e) of a.
Parameters
a (REAL)
The input value.
Return Value
Returns a REAL.
Remarks
If a is less than zero, the task will fault. An error will be logged in the Event Log and the
user program running on the task will stop.
Examples
LN(1.0) returns 0.0
LN(2.718282) returns 1.0.
5.14.2.26. LOG_EVENT Function
LOG_EVENT(a, ...)
Logs the values of the operands a, ... in the Event Log. This function can have 1 to 3
operands. This function is very useful for troubleshooting.
Parameters
a, etc. (REAL, DINT, or DWORD)
The values to record in the Event Log.
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