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APPLICATION EXAMPLE 1: BI-DIRECTIONAL MUTING ON A CONVEYOR
1A - Bi-directional muting with 2 muting sensors,
1 mutable and 1 non-mutable safety device
Conveyor
Mechanical fences
safety switch
L
A
C
Sensor positioning
Vmax = (maximum) conveyor speed
Vmin = (minimum) conveyor speed
Tmaxmuting = maximum muting time (selected with program selector B)
Lmin = (minimum) length of conveyor (e.g. palette)
Lmax = (maximum) length of conveyor (e.g. palette)
Distance A crossing points
Distance A muting sensors SM1a – SM2a and SM1b –SM2b
Distance B crossing points
Distance B muting sensors SM2a – SM2b
Distance C between 2 following conveyors
For safety related sensor positioning information, refer to the Application Warnings.
Application description
A conveyor is loading and unloading a hazardous zone guarded by two safety devices (e.g. FF-SB safety light curtain, GK
safety key interlock switch). As the conveyor enters and exits the zone passing through the same opening, the movement is
bi-directional.
The muting system is composed of the following elements:
• the FF-SRM200P2 muting module,
• 1 mutable safety device (e.g. FF-SB safety light curtain) detecting access through the opening for the conveyor,
• 1 non-mutable safety device (e.g. GK safety key interlock) to monitor the safety door ("guard only"),
• example 1A: 2 auxiliary muting sensors SM1 and SM2 to start and end the muting sequence (crossed through scan or retro-
reflective-polarised photoelectric sensors),
• example 1B: 2 pairs of muting sensors SM1a, SM2a, SM1b and SM2b to start and end the muting sequence (e.g. limit
switches, proximity sensors, through scan or retro-reflective-polarised photoelectric sensors).
The use of the second mutable or non-mutable safety device connectable to the same FF-SRM200P2 module is optional.
107111-11-EN FR26 GLO 503 Printed in Germany
!
Conveyor
GK
door
B
A
L
C
Q
R
S
T
-
and
-
R
T
-
1B - Bi-directional muting with 2 pairs of muting sensors,
1 mutable and 1 non-mutable safety device
Conveyor
safety switch
Mechanical fences
L
A
C
A < Vmin x 10 s
B < Vmin x Tmaxmuting – Lmax
C > 2 x A + B + Lmax
!
Conveyor
GK
door
B
A
L
C
9
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