logRead (Functionblock)

logRead is used for reading entries in the Datalogger. It will return the record from the current read position.

To read from file- or memory-based Dataloggers, please use logReadRaw.

Input:

None

Output:

tag : SINT

Tag value for the record.  

year : SINT

Year value from the timestamp.  

month : SINT

Month value from the timestamp.  

day : SINT

Date value from the timestamp.  

hour : SINT

Hour value from the timestamp.  

minute : SINT

Minute value from the timestamp.  

second : SINT

Second value from the timestamp.  

linsec : DINT

The timestamp in seconds since 1980-1-1 00:00:00.

value : ARRAY [1..8] OF DINT

Value for each of the up to 8 separate values logged in the record.

status : SINT

Declaration:

FUNCTION_BLOCK logRead;
VAR_OUTPUT
   tag    : SINT;                | Tagvalue for the record
   year   : INT;                 | 1980..2048
   month  : SINT;                | 1..12
   day    : SINT;                | 1..31
   hour   : SINT;                | 0..23
   minute : SINT;                | 0..59
   second : SINT;                | 0..59
   linsec : DINT;                | Time in seconds since 1980-1-1 00:00:00 
   value  : ARRAY[1..8] OF DINT; | Upto 8 values for the record
   status : SINT;                | status
END_VAR;

Example:

INCLUDE rtcu.inc
 
VAR
   LogReader : logRead; // Declare an instance of the LogRead functionblock
END_VAR;
 
PROGRAM test;
 
BEGIN
   ...
   logFirst();
   LogReader(); // Read the logentry
   // LogReader.tag contains the tagvalue
   // LogReader.value[1] contains the first value
   // LogReader.year contains the year from the timestamp
   // etc etc
   ...
END;
END_PROGRAM;