ABB AC500-S Safety User Manual page 335

Configuration and programming
AC500-S Libraries > SafetyBlocks_PLCopen_AC500_v22.lib
Muting is the intended suppression of the safety function (e.g., light barriers). In this FB, sequential muting
with four muting sensors is specified.
Muting is the intended suppression of the safety function. This is required, e.g., when transporting the mate-
rial into the danger zone without causing the machine to stop. Muting is triggered by muting sensors. The
use of two or four muting sensors and correct integration into the production sequence must ensure that no
persons enter the danger zone while the light curtain is muted. Muting sensors can be proximity switches,
photoelectric barriers, limit switches, etc. which do not have to be failsafe. Active muting mode must be indi-
cated by indicator lights.
There are sequential and parallel muting procedures. In this FB, sequential muting with four muting sensors
was used; an explanation for the forward direction of transportation is provided below. The FB can be used in
both directions, forward and backward. The muting should be enabled with the MutingEnable signal by the
process control to avoid manipulation. When the MutingEnable signal is not available, this input must be set
to TRUE.
The FB input parameters include the signals of the four muting sensors (MutingSwitch11 ... MutingSwitch22)
as well as the OSSD signal from the "active opto-electronic protective device", S_AOPD_In.
The S_StartReset input shall only be activated if it is ensured that no hazardous situation can occur when
the PES is started.
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