Overview of EL5122 functions

The EL5122 offers a wide range of functions. The following table provides an overview of the available functions. A detailed description can be found in the individual chapters.

To use the extended functions, the corresponding functions must be selected via the "Predefined PDO Assignment". The assignment is described in chapter "Process data".

Basic functions	Description
Selecting the encoder type	Encoders or counters/pulse generators with the signal levels according to TTL or Open Collector can be selected.
Encoder operating voltage	The encoder supply is set centrally for both channels either to 5 V_DC, 12 V_DC or 24 V _DC.
Evaluation of the counter value	The input signal can be subject to 4-fold, 2-fold or 1-fold evaluation.
Counter limits	The value range within which counting takes place can be defined.
Counter overflow / counter underflow	If the count limit is exceeded or underrun, this is indicated in separate process data.
Counting direction	The counting direction can be adapted to the application.
Counter value reset	Allows repetitive resetting of the counter value via an edge (positive/negative) at the Gate/Latch input.
Set counter value	The counter value can be set at runtime to a predefined counter value via a PLC variable or an edge (positive/negative) at the Gate/Latch input.
Save counter value	The current counter value can be stored, independent of the cycle time, in a separate process datum via an edge (positive/negative) at the Gate/Latch input. You can parameterize whether the function is executed at each external edge or only once after each activation.
Lock counter value	The counter value can be locked by an edge (positive/negative) on the Gate/Latch input or by a PLC variable.

Extended functionalities	Description
Frequency measurement	The average frequency of the input signal within a given timeframe can be output directly.
Period value measurement	The period value of the last period within the PLC cycle can be output directly.
Velocity, speed calculation	The average velocity or speed of the input signal within a specified timeframe can be output directly.
Adjustable interference pulse filters	To suppress interference, a filter can be set for each of the input signals.
Diagnostic data	Error messages are communicated to the EtherCAT Master / TwinCAT via "DiagMessages".

Process data	Description
Operation modes	The scope of the process data can be selected via "Predefined PDO Assignment".
Synchronicity mode	In addition to the frame-triggered operation mode (SM mode), a mode based on synchronization via the distributed clocks is available.

Description of the inputs	Description
Gate/Latch	A Gate/Latch input is provided for 24 V_DCsignals with a min. pulse duration t_ONof > 1 µs. This can be used for resetting, setting and storing the counter value.