Page 36 - Keubler Motion Sensors

Basics

Encoders Functional Safety

Incremental and absolute encoders for Safe incremental encoder function Safe absolute encoder function
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Functional Safety In order to achieve safe incremental information In order to obtain safe information with the encoder
with the encoder, the controller must monitor the regarding the absolute position, the controller
Further information about Functional Safety validity of the analogue, 90° phase-shifted sine/ counts the incremental pulses and compares the
can be found in our catalogue ”Functional cosine signals with the help of the function: result with the absolute positions also provided by
Safety” or at: sin² + cos² = 1 the encoder.
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Safe mechanical connection
A 100% reliable mechanical connection is required
for a safe function in the applications. Suitably
sturdy fixing elements can help eliminate the risk
of faults.

Compliance with Safety standards
According to EN ISO 13849-1, EN ISO 13849-2 and EN 61800-5-2 up to SIL3/PLe/Cat.4 the following safety
functions can be implemented with the encoder:

Acronym Designation Function
SSX Safe Stop 1 or 2 Monitoring of the braking ramp and switch-off of the motor
after standstill (SSI) or monitoring of the braking ramp and
SOS after standstill (SS2). Corresponds to Stop Category 1 or
2 acc. DIN EN 60204-1.
SOS Safe Operating Stop Monitoring of the standstill of the active motor.
SLA Safely Limited Acceleration Monitoring of the exceeding of an acceleration limit value.
SLS Safely Limited Speed Monitoring of a speed limit value.
SLT Safely Limited Torque Monitoring of a torque / force limit value.
SLP Safely Limited Position The exceeding of a position limit value is monitored.
SEL Safe Emergency Limit Safe monitoring of the minimum and maximum position or of
the allowed position range. Optional monitoring of the speed /
position limit curve for minimizing the worst-case overtravel.
SLI Safely Limited Increment The respect of a specific step value during the movements is
monitored.

SDI Safe Direction Monitoring of the unintended direction of movement of the
motor.
SBC Safe Brake Control Safe control and monitoring of an external brake.
SCA Safe Cam A safe output signal is generated when the motor position is
in a specified range.

SSM Safe Speed Monitor A safe output signal is generated when the motor speed is
lower than a specified value.
SAR Safe Acceleration Range Monitoring of the respect of the acceleration of the motor
within specified limit values.
ECS Encoder Status Error status of the speed / position sensor.
PDM Position Deviation Muting Muting of the deviation monitoring in 2-sensor operation.

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