Siemens SIMOTION D4x5-2 Commissioning And Hardware Installation Manual page 293

Example 1:
● Measuring input input is only to measure positive edges.
● 6 negative and 5 positive edges occur in cycle n.
● 2 positive edges are measured
Result: The number of lost positive edges is 3.
Example 2:
● Measuring input input is to measure any edges.
● 11 edges occur in cycle n.
● 2 edges are measured
Result: 7 lost edges are signaled; 2 further edges cannot be recorded due to the limitation of
the counter to 7 in the module.
Evaluation in the user program
In eveluation of the LEC, ensure that the edge counter only fills 3 bits of the LEC byte in each
case. The non-relevant bits have to be masked in this way.
Lost edge counter
for I/O channel 1 / 3 / 5 / 7
for I/O channel 0 / 2 / 4 / 6
Program example
// lec_1 : IO variable in the SCOUT,
with LEC measuring input 1 (type byte)
// lec_2 : IO variable in the SCOUT, symbolically interconnected with
LEC measuring input 2 (type byte)
VAR
END_VAR
LecMeasuringInput1:= (lec_1 AND 16#07);
LecMeasuringInput2:= SHR((lec_2 AND 16#70),4);
SIMOTION D4x5-2
Commissioning and Hardware Installation Manual, 03/2018, A5E33441636B
LecMeasuringInput1 : BYTE;
LecMeasuringInput2 : BYTE;
7.13 Configuration of the technology objects and I/O variables
Relevant bits in the LEC byte
7 6
x
symbolically interconnected
Commissioning (software)
5 4 3 2
x x
x
// even channel
// odd channel
1 0
x x
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