BECKHOFF EL6900-FB - Manual (Page 53)

Function blocks
Function blocks for TwinSAFE logic terminals 51
3.8 The MUTING function block
3.8.1 Functional description
FB MUTING is used to realize specified suppression of the protective function, e.g. for transporting
material into the protection zone. The output of the block remains set, despite interruption of the
connected sensors.
The muting inputs are used to verify that they are operated in a defined order. Muting can be activated via
the Enable input. If the input is logic 0 an interruption of the protective device results in immediate
shutdown of the FB output. Otherwise only if the muting sequence is violated. The ‘SequentialInputs’
input can be used to specified whether 2 inputs are checked in parallel or sequentially. A filter time up to
500 ms can be set for the muting inputs in order to prevent bouncing of the muting signals and therefore
violation of the muting sequence. The maximum duration of the muting process can be monitored via the
‘Max. MutingTime’. The muting process starts with a logic 1 signal of the first muting input and ends with
the logic 0 signal of the last muting input. The value can be set to a maximum of 10 minutes or to 0, which
corresponds to deactivation of the monitoring. During this period the ‘MutingActive’ output of the block is
set. The protective device (AOPD - Active Opto-electronic Protection Device), for example a light grid, is
connected at the ‘OSSDIn(x)’ inputs. Feedback signals can be connected at the EDM inputs. In the
default setting the inputs are disabled. Direct outputs are connected via the ‘MuteOut’ button, outputs that
are delayed by up to 30 seconds via the ‘MuteDelOut’ button.
Figure 3-17: MUTING function block
Note
KL6904
The Muting block is not available in the KL6904.