Connection of Safety Switches
The Safety Module may be used to monitor safety interlocking
switches that determine the position of a guard or gate. To
achieve Category 4 operation per ISO 13849-1 (EN 954-1),
two positive-opening safety switches must operate
concurrently when the guard or gate is opened.
The Safety Module verifies concurrent opening of two contacts
– one from each safety switch. Reset of the Safety Module is
not possible if one switch fails to open or if a short circuit
between the safety interlocking switches occurs.
S12
S22
S11 S21
Safety Gate or Guard with
end-of-travel stops and two
individually mounted
Safety Interlocking Switches
OPEN
Figure 3. Wiring using contacts from two safety switches
Connection of Reset Switch
The reset circuit switch can be any mechanical switch, such as a normally open momentary switch, or a two-position key
switch. The reset switch must be capable of reliably switching 8 to 12 V dc at 10 to 15 milliamps. As shown in the hookup
drawings, the reset switch connects between Safety Module terminals S33 and S11.
The reset switch must be located outside of – and not be accessible from – the area of dangerous motion, and must be
positioned so that any area of dangerous motion may be observed by the switch operator during the reset procedure. See
warning below.
WARNING: Reset Switch Location
All reset switches must be accessible only from outside, and in full view of, the hazardous
area. Reset switches must also be out of reach from within the safeguarded space, and must
be protected against unauthorized or inadvertent operation (for example, through the use of
rings or guards). If any areas are not visible from the reset switch(es), additional means of
safeguarding must be provided. Failure to do so may result in serious bodily injury or death.
Automatic Reset Mode
The Safety Module may be configured (via hookup) for automatic reset. If no MSC contacts are monitored, install a jumper
between terminals S33 and S34. The Safety Module will reset (and its outputs energize) as soon as the switch returns to
its armed (closed-contact) position.
Automatic reset is useful for some automated processes. However, if automatic reset is used, it is necessary to provide a
means of preventing resumption of hazardous machine motion, until an alternate reset procedure is performed. The
alternate procedure must include a reset/restart switch, located outside the area of dangerous motion, which is positioned
so that any area of dangerous motion may be observed by the switch operator during the reset procedure. See Warning
below.
WARNING: Reset Routine Required
U.S. and international standards require that a reset routine be performed after clearing the cause of a
stop condition (for example, arming an E-stop button, closing an interlocked guard, etc.). Allowing the
machine to restart without actuating the normal start command/device can create an unsafe
condition which may result in serious injury or death.
ES-FA-9AA and ES-FA-11AA E-Stop Safety Module
6
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P/N 60606 Rev. G