Siemens SIMOTION D4x5-2 Commissioning And Hardware Installation Manual page 292

Commissioning (software)
7.13 Configuration of the technology objects and I/O variables
Figure 7-63
ACTVAL, terminal status
ACTVAL represents the logical channel status, considering an configured inversion.
● in the case of a DI, ACTVAL corresponds to the logic state of the DI
● in the case of an MI, ACTVAL corresponds to the logic state of the measuring input
● in the case of a DO / CAM, ACTVAL corresponds to the actual terminal status of the digital
output or output cam output. If the terminal status differs from the controlled status, there
may be a short-circuit or fault of the output driver.
LEC, lost edge counter
The LEC (Lost Edge Counter) counts the lost edges at a measuring input input. Lost edges
are edges that must be measured according to the measurement job, i.e.
● the measurement job is active and
● the edge corresponds to the edge selection
For example, if only rising edges are to be acquired according to the measurement job, only
lost "rising" edges will be acquired.
Note
The precondition for the use of the LEC is that "servo" is set as the processing cycle clock for
the measuring input TO.
If the capacity of the measuring input input (2 edges per servo cycle or per measurement job)
is exceeded, the edges will be lost.
Up to 7 lost edges
● can be acquired per servo cycle (cyclic measurement) or
● per measurement job (single measurement)
.
If more than 7 edges are lost, the counter will stop at the value 7.
Therefore: if the value is 7, 7 or more edges have been lost.
Lost edges can indciate that measurement is faulty (contact bounce, disturbances, etc.).
292
Supplementary interconnection options for X142 I/Os
Commissioning and Hardware Installation Manual, 03/2018, A5E33441636B
SIMOTION D4x5-2