ABB AC500-S Safety User Manual page 359

Configuration and programming
AC500-S Libraries > SafetyBlocks_PLCopen_AC500_v22.lib
Muting is the intended suppression of the safety function. In this FB, parallel muting with two 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 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 push buttons, proximity
switches, photoelectric barriers, limit switches, etc. which do not have to be failsafe. Active muting mode
must be indicated by indicator lights.
There are sequential and parallel muting procedures. In this FB, parallel muting with two muting sensors was
used; an explanation is provided below. The positioning of the sensors should be as described in Annex F.7
of IEC 62046, CD 2005, as shown in Figure 48. The FB can be used in both directions, forward and back-
ward. However, the actual direction cannot be identified. The muting should be enabled with the MutingEn-
able signal by the process control to avoid manipulation.
The FB input parameters include the signals of the two muting sensors (S_MutingSwitch11 and S_MutingS-
witch12), the OSSD signal from the "active opto-electronic protective device", S_AOPD_In, as well as two
parameterizable times (DiscTimeEntry and MaxMutingTime).
The S_StartReset input shall only be activated if it is ensured that no hazardous situation can occur when
the PES is started.
30.03.2017 AC500-S 359