ABB AC500-S Safety User Manual page 245

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 trans-
porting the material into the danger zone without causing the machine to stop. Muting is trig-
gered 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 fail-safe. Active muting mode must be indicated 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 AOPD 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.
Table 51: FB name: SF_MutingSeq
Name Data type
VAR_INPUT
Activate BOOL
S_AOPD_In BOOL
MutingSwitch11 BOOL
MutingSwitch12 BOOL
2020/06/19
Initial value Description, parameter values
FALSE Ä Table 16 "General input parameters" on page 192
FALSE Variable.
OSSD signal from AOPD.
FALSE: Protection field interrupted.
TRUE: Protection field not interrupted.
FALSE Variable.
Status of muting sensor 11.
FALSE: Muting sensor 11 not actuated.
TRUE: Workpiece actuates muting sensor 11.
FALSE Variable.
Status of muting sensor 12.
FALSE: Muting sensor 12 not actuated.
TRUE: Workpiece actuates muting sensor 12.
3ADR025091M0208, 12, en_US
Configuration and programming
AC500-S libraries > SafetyBlocks_PLCopen_AC500_v22.lib
245