Pilz PSSu E F ABS SSI - Manual (Page 10)

Safety
Operating Manual PSSu E F ABS SSI(­T)
1001455­EN­06 10
3 Safety
3.1 Intended use
The module may be used for failsafe applications in system environment B (automation
system PSS 4000).
The modules PSSu E F ABS SSI and PSSu E F ABS SSI­T may be used as a safety com­
ponent in accordance with the Lifts Directive 95/16/EC, EN 81­1, EN 81­2 and EN 115­1.
The programmable safety system should be installed in a protected environment that meets
at least the requirements of pollution degree 2. Example: Protected inside space or control
cabinet with protection class IP54 and corresponding air conditioning.
With the counter module you can implement the following safety functions:
Monitoring of:
} Position
} Speed
} Standstill
Two counter modules and two sensors have to be used. It is possible to use either two
counter modules of the same type or a combination of PSSu E F INC or PSSu K F INC and
PSSu E F ABS SSI. Due to redundant and diverse input values and use of the function
blocks FS_IncrementalEncoder, FS_AbsoluteEncoder and FS_CounterDual, PL e (Cat. 4)
and SIL CL 3 can be achieved.
To apply the module you will need to have read and understood the description of the func­
tion blocks (s. Online help).
Requirements of the PSSu system:
} The counter modules must be part of a control system PSSu PLC or PSSu multi (not
decentralised I/O system).
} The function blocks have to be assigned to the FS resource of the PSSu system where
the counter modules are inserted. Control via SafetyNet is not permitted.
Demands on the sensors:
} Absolute encoders with SSI interfaces may be used as sensors.
} Connect the sensors mechanically independently to the axis. If this is not possible, the
connection should be positive­locking without wearing parts as e.g. chains or drive
belts. If it is not possible to avoid this, the mechanical connection of the sensors must
be monitored. Alternatively, it is possible to use a sensor that internally has 2 independ­
ent measured value recording systems.
Please note during configuration and within the user program:
} The input values must be diverse. This can be achieved through different
} Scaling
– Direction of rotation/count direction
– Offset
To avoid errors during a simultaneous counter overflow, one of the absolute en­
coders must be equipped with an offset.