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SC22-3 Safety Controller
Instruction Manual
Appendix A
Complementary (PNP device): This circuit can meet ISO
13849-1 category 2, 3, or 4 requirements depending on the
safety rating and the installation of the output device . This circuit
can detect a short circuit between channels . In the actuated
condition (e .g ., S1 ON/S2 OFF below) a short across the closed
contact can cause the response time to increase based on the
debounce time . In this situation, the response time could be
longer than specified, based on the (selected) debounce time,
see Section 3 .2 .2 .
2-Ch, 2 Terminal
PNP
24V
Rope Pull - Single Channel
1-Ch.
1 Terminal
1-Ch.
2 Terminals
1-Ch.
1 Term, PNP
Rope Pull - Dual Channel
2-Ch, 2 Terminals
2-Ch, 3 Terminals
2-Ch, 4 Terminals
24V
Rope Pull - Dual Channel Complementary
Complementary,
2 Terminals
Complementary,
3 Terminals
Complementary,
2 Terminals, PNP
24V
Revision History
1-Aug-2007 Protective Stop was removed from this document and is with the Optical Sensor document
ON
ON
OFF
ON
S1 S2
A.9 Enabling Device
An enabling device is a manually operated control that,
when continuously actuated, will allow a machine cycle to
be initiated in conjunction with a start control . Standards
that cover the design and application of enabling devices
include:
ISO 12100-1/-2
IEC 60204-1
ANSI/NFPA 79
ANSI/RIA R15 .06
ANSI B11 .19
A.9.1 Enabling Device Guidelines
Depending on the application, the use of the enabling device
may require supervision and allow only limited machine
operation when the individual actuating the device is exposed to
a hazardous situation . When the enabling device is in use, the
control of machine motion must be prevented from other sources
that would override the function of the enabling device . Simply
actuating the enabling device should not create a hazard .
An enabling device allows a hazardous situation when
continuously actuated in one position only . In any other position,
the hazard must be eliminated and the start function be inhibited .
Since an individual’s reaction to an emergency situation may be
either to release or to tighten the grip, many standards require
the use of three-position devices:
• Position #1: the OFF function of the switch (actuator is not
operated) .
• Position #2: the enabling function (actuator is operated in its
midpoint) .
• Position #3: the OFF function of the switch (actuator is
operated past its midpoint) .
Release of, or compression past, the midpoint-enabled position
(#2) of the device must initiate an immediate stopping of
hazardous motion or situations . It is required that the enabling
device be released and re-actuated before machine motion can
be reinitiated .
If allowed, for two-position types, the positions are as follows:
• Position #1: the OFF function of the switch (actuator is not
operated) .
• Position #2: the enabling function (actuator is operated) .
The stop function must be either a functional stop Category 0
or a Category 1 (see ANSI NFPA79 Section 9) . The design and
installation of the enabling device must consider the ergonomic
issues (force, posture, etc .) of sustained activation . A visual
means of indicating that the device is active may be required .
Only trained and qualified individuals are allowed to operate the
enabling device if it is bypassing other safeguards . Safe work
procedures must include, but are not limited to, the use of the
device, the associated hazards, and the task requiring the use of
the device .
If more than one individual is to be safeguarded by the use of
enabling devices, each individual must have their own device .
Each enabling device must be concurrently operated before
machine motion can be initiated .
The means to return the machine to production mode must
be located outside the hazardous area, where it can not be
reached from within that area and is guarded against unintended
operation . In addition, the reset switch operator must have full
view of the entire guarded area and verify that the area is clear
of individuals during the reset procedure .