ABB AC500-S Safety User Manual page 334

Configuration and programming
AC500-S Libraries > SafetyBlocks_PLCopen_AC500_v22.lib
4.6.6.12 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 condition 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 clear-
ance 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 applica-
tions, an indication signal of muting is necessary)
CD IEC 5.5.1: ... an indicator to show when the muting function is active can be necessary.
62046/Ed. 1:
The muting function shall be initiated and terminated automatically ... Incorrect signals,
2005
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:
n
n
n
n
n
5.5.3: The following measures shall be considered: ...
n
Annex F.3 Four beams – sequence control: (see also Fig. F.3.1 and table F.1)
The initiation of the muting function depends on monitoring the correct sequence of
activation 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 terminated.
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: 4.11.4: Restart following power failure/spontaneous restart
2003
334
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
operation;
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
cancelled and all hazardous movements stopped;
AC500-S 30.03.2017