Mute Enable (Me) - Banner MM-TA-12B Instruction Manual

Introduction
Mute Devices
The beginning and end of a mute cycle must be triggered by outputs from either
pair of muting devices, depending on the application. The mute device pairs both
must have normally open contacts, or have one device with a PNP output and
one device with a NPN output, both of which fulfill the "muting device require-
ments" in Section 2. These contacts must close (conducting) when the switch is
actuated to initiate the mute, and must open (non-conducting) when the switch is
not actuated and in a power-OFF condition.
The Module monitors the mute devices to verify that their outputs turn ON within
3 seconds of each other. If the inputs do not meet this simultaneity requirement,
a mute condition can not occur.
Several types and combinations of mute devices can be used, including, but not
limited to: limit switches, photoelectric sensors, positive-drive safety switches,
inductive proximity sensors, and "whisker" switches. (See Muting Device
Requirements, Section 3.5.2.1.)

1.12 Mute Enable (ME)

The Mute Enable input is a non-safety-rated input. When the input is closed,
the Module will allow a mute condition to occur; opening this input while the
System is muted will have no effect. If the application does not require Mute
Enable, the input must be left open and the DIP switches configured for "ME
Disable = ON".
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 sec-
ond 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).
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MM-TA-12B Muting Module
Instruction Manual
WARNING . . .
Mute Inputs Must Be
Redundant
It is not acceptable to use a single
switch, device, or relay with two
N.O. contacts for the mute inputs.
This single device, with multiple
outputs, may fail so that the System
is muted at an inappropriate time.
This may result in a hazardous sit-
uation.