4 mute function – Banner SC22-3E Safety Controller with Ethernet User Manual
Page 37
Enable Device
Safety Device
Safety Output
(ON-Delayed)
System Reset
Enable Mode
ON-
Delay
ON-
Delay
ON-
Delay
ON-
Delay
ON-
Delay
ON-
Delay
Don’t Care*
Don’t Care*
Don’t Care*
Enable
Mode ON
Enable
Mode ON
Enable
Mode ON
*Unless it’s an E-Stop or a Rope-Pull
*Unless it’s an E-Stop or a Rope-Pull
*Unless it’s an E-Stop or a Rope-Pull
Enable
Mode OFF
Enable
Mode OFF
Enable
Mode OFF
Figure 18. Timing logic: Enabling device and enable mode
See section
on page 112 for more information.
4.6.4 Mute Function
Safety device muting is the automatically controlled suspension of one or more safety input stop signals during a portion of a machine
operation when no immediate hazard is present or when access to the hazard is safeguarded. Muting sensors can be mapped to one or
more of the following “mutable” safety input devices:
• Safety gate (interlocking) switches
• Optical sensors
• Two-hand controls
• Safety mats
• Protective stops
(E-stop buttons, rope pulls, enabling devices, external device monitoring, and bypass switches are said to be “non-mutable” devices or
functions.)
At least two mute sensors are required for each muting operation (the mute occurs typically 100 ms after the second mute sensor input
has been satisfied). One or two pairs of mute sensors can be mapped to one or more safety input devices so that their assigned Safety
Outputs can remain ON to complete the operation; see section
on page 116 for more information.
Mute Enable. The optional mute enable function can be configured to ensure that a mute function is permitted only at the appropriate
time. If a mute enable input device has been mapped to a mutable safety input device, this safety input device can be muted only if the
mute enable switch is in the Enable (24V dc) state at the time the mute cycle is started. After the mute cycle starts, the ME input can be
turned OFF. A mute enable input device can be mapped to one or more mutable safety inputs.
NOTE: Mute enable is not a safeguarding function, but rather a machine logic function.
Mute
Enable
ON or OFF
Safety
Input
Mute Sensor
Pair
Safety
Output
Figure 19. Timing logic: one mute sensor pair with mute enable
Mute Time Limit (Backdoor Timer). A time limit can be established to limit how long a mute cycle is permitted to be active. The time
limit can be adjusted from 1 second to 30 minutes. A different time limit can be set for each mutable safety input device. Other input
devices that are also muted are affected only by their own mute time limit setting. The mute time limit can be disabled. When disabled,
the time limit for the mute function for that input device is infinite.
SC22-3/-3E Safety Controller Instruction Manual
P/N 133487 rev. C
www.bannerengineering.com - tel: 763-544-3164
37