ABB AC500-S Safety User Manual page 244

Configuration and programming
AC500-S libraries > SafetyBlocks_PLCopen_AC500_v22.lib
4.6.4.12 SF_MutingSeq
Standards Requirements
IEC 61496-1:2004 A.7 Muting
A.7.1.2 There shall be at least two independent hard-wired muting signal sources to initiate
the function. It shall not be possible to initiate muting when the OSSDs are already in the
OFF-state.
A.7.1.3 The mute function shall only be initiated by the correct sequence and/or timing of the
mute signals. Should conflicting muting signals occur, the ESPE shall not allow a muted con-
dition to occur.
A.7.1.4 There shall be at least two independent hard-wired muting signal sources to stop the
function. The muting function shall stop when the first of these muting signals changes state.
The deactivation of the muting function shall not rely only on the clearance of the ESPE.
A.7.1.5 The muting signals should be continuously present during muting. When the signals
are not continuously present, an incorrect sequence and/or the expiration of a pre-set time
limit shall cause either a lock-out condition or a restart interlock.
A.7.4 Indication: A mute status signal or indicator shall be provided (in some applications, an
indication signal of muting is necessary)
IEC 62046/ 5.5.1: ... an indicator to show when the muting function is active can be necessary.
Ed. 1:2005
The muting function shall be initiated and terminated automatically ... Incorrect signals,
sequence, or timing of the muting sensors or signals shall not allow a mute condition. It shall
not be possible to initiate the muting function when:
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5.5.3: The following measures shall be considered: ...
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Annex F.3 Four beams - sequence control: (refer also to Fig. F.3.1 and table F.1 in the
standard)
The initiation of the muting function depends on monitoring the correct sequence of activa-
tion of the muting sensors. For example, in the muted condition, if S2 (in this document
MS_12) is deactivated before S3 (in this document MS_21) is activated, muting is termi-
nated.
Annex F.5: Methods to avoid manipulation of the muting function: ... use a muting enable
command generated by the control system of the machine that will only enable the muting
function when needed by the machine cycle.
EN 954-1:1996 5.4 Manual reset
ISO 12100-2:2003 4.11.4: Restart following power failure/spontaneous restart
244
the protective equipment OSSDs are in the OFF-state;
the protective equipment is in the lock-out condition.
initiation of the muting function by two or more independent muting sensors such that a
single fault cannot cause a muted condition;
termination of the muting function by two or more independent muting sensors such that
deactivation of one sensor will terminate the muting function;
use of timing and sequence control of the muting sensors to ensure correct muting oper-
ation.
limiting muting to a fixed time that is only sufficient for the material to pass through the
detection zone. When this time is exceeded, the muting function should be canceled and
all hazardous movements stopped.
3ADR025091M0208, 12, en_US 2020/06/19