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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 Relevant bits in the LEC byte

7 6 5 4 3 2 1 0

for I/O channel 1 / 3 / 5 / 7 x x x

for I/O channel 0 / 2 / 4 / 6 x x x

Program example

// lec_1 : IO variable in the SCOUT, symbolically interconnected

with LEC measuring input 1 (type byte)

lec_2 : IO variable in the SCOUT, symbolically interconnected with

LEC measuring input 2 (type byte)

VAR

LecMeasuringInput1 : BYTE;

LecMeasuringInput2 : BYTE;

END_VAR

LecMeasuringInput1:= (lec_1 AND 16#07); // even channel

LecMeasuringInput2:= SHR((lec_2 AND 16#70),4); // odd channel

Commissioning (software)

7.13 Configuration of the technology objects and I/O variables

SIMOTION D4x5-2

Commissioning and Hardware Installation Manual, 03/2018, A5E33441636B 293

Siemens SIMOTION D4x5-2 User Manual

Questions and Answers: