P/N 133487 97
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
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.
Muting Sensor Pair - Dual Channel
2-Ch, 2 Terminals 2-Ch, 3 Terminals 2-Ch, 4 Terminals
24V
2-Ch, 2 Terminals
2 PNP
Muting Sensor Pair - Dual Complementary
Complementary,
2 Terminals
Complementary,
3 Terminals
Complementary,
2 Terminals, 2 PNP
24V
20-Sept-06 Rev. D - Moved 24V, ON and OFF text closer to drawings.
21-Nov-06 Rev. E - Add + to 2-Ch, 3 and 4 Terminals and Complementary, 3 Terminals
10-Jan-07 Rev F - Change + sign text to outlines
25-May-07 Rev G - Revised Dual Channel PNP and Complementary PNP
OFFOFF
ONOFF
A.11.3 Mute Enable (ME)
The Mute Enable input is a non-safety-rated input. When the
input is closed, the Controller will allow a mute condition to
occur; opening this input while the System is muted will have no
effect.
Typical uses for Mute Enable include:
• To allow the machine control logic to create a “window” for
muting to begin;
• To inhibit muting from occurring; or
• To reduce the chance of unauthorized or unintended bypassing
or defeat of the safety system.
Simultaneity Timer Reset Function
The Mute Enable input can also be used to reset the simultaneity
timer of the mute inputs. If one input is active for longer than
three seconds before the second input becomes active, the
simultaneity timer will prevent a mute cycle from occurring. This
could be due to a normal stoppage of an assembly line that may
result in blocking one mute device and the simultaneity time
running out.
If the ME input is cycled (closed-open-closed) while one mute
input is active, the simultaneity timer is reset, and if the second
mute input becomes active within three seconds, a normal mute
cycle begins. The timing requirement for the closed-open-closed
is similar to the manual reset function. Initially, the input needs
to be active (closed) for longer than 1/4 second, then open for
longer than 1/4 second, but not longer than 2 seconds, and then
must reclose to reset the simultaneity timer. The function can
reset the timer only once per mute cycle (i.e., all mute inputs
M1–M4 must open before another reset can occur).
A.11.4 Mute Lamp Output (ML)
Some applications require that a lamp (or other means) be used
to indicate when the safety device (e.g., light screen) is muted;
the Controller provides for this through the status outputs. If
a monitored output signal is required (see Caution below),
status outputs O9 and O10 can be configured for a monitored
output. The monitored output will prevent the initiation of a mute
after an indicator failure is detected. If the application requires
compliance with UL 61496, Lamp Monitoring must be selected
and the lamp used must meet applicable requirements.
CAUTION . . .
Mute Status Must Be
Readily Observed
Indication that the safety device is muted should
be provided and be readily observable.
Failure of this indication should be detectable and prevent the
next mute, or operation of the indicator should be verified at
suitable intervals.
Lamp monitoring must be selected if the application requires
compliance with UL 61496.
A.11.5 Muting Time Limit (Backdoor Timer)
The muting time limit (backdoor timer) allows the user to select
a maximum period of time that muting is allowed to occur. This
feature hinders the intentional defeat of the muting devices to
initiate an inappropriate mute. It is also useful for detecting a
common mode failure that would affect all mute devices in the
application.
The timer begins when the second muting device makes the
simultaneity requirement (within 3 seconds of the first device),
and will allow a mute to continue for the predetermined time.
After the timer expires, the mute ends – no matter what the
signals from the mute devices indicate. If the input device being
muted is in an OFF state, the mapped OSSD outputs will turn
OFF and must be manually reset (if the input device is configured
for manual reset).
WARNING . . .
Muting Time Limit
An infinite time for the backdoor timer
(i.e., disabling) should be selected only if the
possibility of an inappropriate or unintended mute cycle is
minimized, as determined and allowed by the machine’s risk
assessment. It is the user’s responsibility to ensure that this does
not create a hazardous situation.
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