Banner EZ-SCREEN LPM Series - Muting Timing Sequences

• 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 (ME/OR2) can also be used to reset the simultaneity timer of the mute inputs. If one mute input is
active for longer than three seconds before the second input becomes active, the simultaneity timer will prevent a mute
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/OR2 input is cycled (closed-open-closed) while at least one mute input is active, the simultaneity timer is reset. If
both mute inputs then becomes active within three seconds of each other, a normal mute begins. The timing requirement
for the closed-open-closed is similar to the manual reset function. Initially, the input needs to be closed (+24V dc), then
open for longer than 1/4 second, but not longer than 2 seconds, and then must re-close to reset the simultaneity timer. The
function can reset the timer only once per mute.
Note: The Simultaneity Timer Reset function using the ME/OR2 input may not be used to reset an expired
Mute Timer (Backdoor Timer).
8.7 Muting Timing Sequences
Note: The timing logic is the same for two and four mute device applications as there are only two mute
device inputs.
Light Screen
Defined Area
OSSD
Outputs
Mute
Mute
Enable
M1
M2
< 3s
Don’t care
Blocked
Clear
Open
Open
On
Off
< 3s
Active
Inactive
Mute prevented by Mute Enable signal
Open
Closed
Figure 37. Timing Logic: Mute Configuration 1 or 2, Mute Function with Mute Enable
EZ-SCREEN Low-Profile System with Integral Muting
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