Dynamic sampling

The safe inputs SE1..SE3 can be monitored for dynamic sampling. The safe outputs SA1 and SA2 can be dynamically sampled. Dynamic sampling means that a clocked 24 VDC signal is installed or sent instead of a static 24 VDC signal. "Static signal errors" can be detected through dynamically sampled input and output signals by cyclically monitoring the signals at the signal inputs for the dynamic sampling pattern.

Dynamic sampling of the safe inputs

In order to be able to detect cross circuits in the safe input pair, the period durations Prm72 / Prm74, Prm78 / Prm80 and Prm84 / Prm86 must be selected differently.

The dynamically sampled signal can be supplied externally or be removed at the SDYN1 and SDYN2 outputs. The dynamic sampling outputs (SDYN1 and SDYN2) supply a dynamically sampled 24 VDC supply voltage that can be connected to the safe inputs via a switch contact. The outputs SDYN1 and SDYN2 are not safe. The monitoring throught the inputs SE1..SE3 is safe.

Application notes:

If the dynamic sampling of the safe inputs is activated, they must be supplied by the dynamic sampling outputs SDYN. Siehe 'Controller card KW-Rx7: [XS20] safety I/O '.
If the safe inputs are not dynamically sampled, they must be supplied by an external 24 VDC supply.
Conversely: If the safe inputs are connected to a not dynamic sampled 24 VDC supply, dynamic sampling must not be activated.

Dynamic sampling of the safe outputs and the dynamic sampling outputs

The ratio of dynamic sampling impulse duration to dynamic sampling period (e. g. Prm88/Prm89) must be greater than 1:10.

Notes for parameter setting

The parameters of the dynamic sampling periods SEx.x and SDYNx must be set the same so that the output dynamization signal and the monitoring of the dynamization of the input signal do not diverge.

For the duration of the dynamic sampling pulse, we recommend setting the parameters SEx.x at least 100 µs longer than the corresponding generated dynamization pulse SDYNx. The filtering of the safety inputs critically assesses exceeding the specified pulse length, while falling below is tolerated.

Explanation:

If the parameters are set the same, jitter can lead to longer dynamization pulses, which unintentionally but functionally correctly lead to the switching command driver being switched off and thus triggering the error message 2320 'Output stage enable is inactive' Info1:1 Info2:5. The error message occurs regardless of whether the dynamization of the safe inputs is activated or not.

Setting or adaptation of the dynamization pulse duration SEx.1 and SEx.2 (Prm 71, 73, 77, 79, 83 and 85) in the safe parameter editor.