Pilz PSSu E F AI I - Manual (Page 14)

Function description
Operating Manual PSSu E F AI I(­T)(­R)
21981­EN­05 14
WARNING!
Limit values selected in the user program too low or too high!
Risk of serious injury and death!
– Take into account the max. safety­related accuracy when defining
the limit values in the user program.
} For safe resolution up to 256 levels you will need to use two analogue inputs and to
carry out a feasibility test.
} With 2­channel mode, the achievable safety­related accuracy will depend on the mod­
ule's measuring accuracy and sensors.
} The module's measuring accuracy is calculated by adding all deviations from the meas­
uring range limit value (see chapter entitled "Technical Details"). With 2­channel, di­
verse operation, this value is doubled in the worst case.
Illustration of the resolution ranges:
2 4 8 16 32 64 128 256 512 1024 2048 4096
0 1 2 3 4 5 6 7 8 9 10 11 Bit
Resolution
Safe (1 analogue input)
Safe (2 analogue inputs)
Standard
MSB LSB
4.1.2 Integrated protection mechanisms
When the PSSu E F PS1(­T) is used to supply the system, the module supply is buffered
for 20 ms if the supply voltage is interrupted.
The module detects the following errors:
} Start­up error
} Configuration error
} FS communication error
} Bus termination error
4.2 Configuration
4.2.1 Converter characteristics/default value
The table below shows the converted data formats of the analogue input currents. When
the digital values are converted into I/O data elements, the three highest binary digits are
filled with "0".