P/N 133487
21
Banner Engineering Corp.
•
Minneapolis, U .S .A .
www .bannerengineering .com • Tel: 763 .544 .3164
SC22-3 Safety Controller
Instruction Manual
System Installation
3.4 Resets
Two Reset types are available:
• Manual Reset: used to reset a safety output that has turned
OFF in response to a Stop signal from safety input device
configured for manual (Latch mode) reset . The reset signal
type can be configured to be either monitored or non-monitored
(the default setting is monitored) and
• System Reset: used to recover from a fault condition or
to restart the Controller after a new configuration has been
altered . This reset device (a button or switch) connects to a
dedicated input terminal on the Safety Controller, labeled SR .
The reset signal type can be configured to be either monitored
or non-monitored (the default setting is monitored) .
Automatic and Manual Reset Inputs Mapped to the Same
Safety Output. Safety input devices can be configured for either
manual (Latch mode) or automatic (Trip mode) reset and both
types can be mapped to the same safety output . In order for
a safety output to turn ON, all associated safety input devices
must be in their Run state . If one or more of these safety input
devices is configured for manual reset and one or more of them
change from the Stop state to the Run state, then the output will
need a valid manual reset signal before it will turn ON .
If two safety inputs, each configured for manual reset, are
mapped to the same safety output, then only one valid reset
operation is required to reset the safety output . A manual reset
operation is valid when all safety inputs mapped to the safety
output are in the Run state and the manual reset is performed . If
a manual reset is performed before a safety input is in the Run
state, the manual reset signal is ignored (except in the case of a
two-hand control and an ON/OFF input) . See Figure 3-1 .
See Section 6 .3 and 6 .4 for more information about resets .
Safety Device 1
(Auto)
Safety Device 2
(Manual)
Manual Monitored
Reset Input
Safety Output
Figure 3-1. Auto and manual monitored reset safety inputs
mapped to the same safety output (safety output has
no delay) timing logic
Safety Device 1
Manual Reset
Safety Device 2
Manual Monitored Reset
Manual Reset
Safety Output
Figure 3-2. Safety inputs with a common reset, mapped to the
same safety output, timing logic
CAUTION . . .
Reset Switch Location
The system reset push button 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 (e .g ., 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 could result in serious bodily injury or death.
