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107111-11-EN FR26 GLO 503 Printed in Germany
APPLICATIONS
Muting means that the safety outputs of a mutable safety
device are “muted” during the non-hazardous portion of a
machine cycle. In a conveyor fed machine area, for
example, an object is allowed to enter the machine area
even when intruding the sensing field of the mutable
safety device. However, the machine must stop when an
operator is intruding the sensing field of the safety device
outside muting sequences. In order to distinguish an
operator from an object the muting module evaluates the
validity of a muting sequence via start and end muting
sensors.
Typical applications:
•
Palletisers / depalletisers,
•
Handling, wrapping and packaging machines,
•
Robotic zones on automotive transfer lines,
•
Automotive paint-shops.
Muting may also be used on workstations manually
loaded or unloaded by an operator. The intrusion of an
operator in the sensing field of the safety device does not
lead to an emergency stop during the non-hazardous
portion of the machine cycle (e.g. the opening stroke of a
press).
Typical applications:
•
Mechanical or hydraulic presses,
•
Press brakes,
•
Operator work stations.
Mutual exclusion may be used in hazardous areas that
can be accessed by both a machine (e.g. a handling
robot) and an operator. The mutual exclusion principle
consists in avoiding that the operator and the machine
are entering or are located together inside the
hazardous area at the same time. Every time the
operator is leaving the hazardous area, he needs to
acknowledge his exit with a push-button, allowing the
handling robot to enter the area again.
Typical applications:
•
Palletisers
•
Handling / Welding robots
PRODUCT DESCRIPTION
The muting sequence is controlled by two or four muting
sensors (like photoelectric sensors, limit switches or
proximity sensors) and the muting module. The muting
sensors must be installed so that only an object is able to
validate a muting sequence but not a person.
When a valid muting sequence starts, the output relay
contacts of the FF-SRM200P2 remain energised even if
the protection field of the mutable safety devices is
intruded by an object. An external white muting lamp
indicates that the safety device is actually muted. Correct
operation of this lamp is monitored by the module in
accordance with the IEC/EN 61496-1 European standard.
The following muting modes can be programmed using
internal selectors of the FF-SRM200P2:
•
Bi-directional or uni-directional muting,
•
With 2 start muting sensors and up to 2 mutable safety
devices,
•
With 4 start / end muting sensors and 1 mutable safety
device.
When a program for one mutable and one non-mutable
safety device is selected, intruding the non-mutable safety
device will always de-energise the module's safety relay
outputs.
The maximum muting time of the connected safety
devices is programmable in a wide range (10 s to
unlimited) and can therefore be adapted to the application.
After power up of the module or after the intrusion of the
safety device outside a valid muting sequence, the module
can be restarted manually via a restart push-button.
When necessary, the connected safety devices can be
tested using the test output of the FF-SRM200P2.
The inputs for the safety devices and for the auxiliary
sensors are floating and isolated optocoupler inputs
allowing the connection of devices with static outputs
(PNP or NPN) or relay outputs.
An External Device Monitoring (EDM) loop is available
in order to monitor external safety contactors driven by the
safety relay outputs of the module.
External indicators provide information on the relay
output status, restart status, muting phase status and on
diagnostics.
Trouble shooting an application using the FF-SRM200P2
muting module is easy through internal and external
diagnostic indicators. The connected muting lamp starts to
flicker when an error has been detected.