Pilz PSSu E S INC 24V se - Manual (Page 13)

Function description
Operating Manual PSSu E S INC 24V se(­T)
1001380­EN­03 13
The electronic module transfers the data and status information to the head module via the
module bus. The choice of function and the function's configuration are defined via the sys­
tem software.
4.1.2.1 Functional inputs (G, L, S)
The single­pole inputs (G, L, S) are used for special functions. Inputs G and L may be con­
nected to external signal sources, e.g. to a higher order control system.
} Input G (gate input)
The counter is stopped with a 1 signal. The module ignores the counter pulses at the in­
puts until a 0 signal returns.
} Input L (input for latch pulse)
At a rising edge, the module stores the current counter value in the latch memory. The
counter continues counting; it is not stopped by the latch pulse. The modul transmits
the stored value to the head module. The period length measurement may be con­
figured as an alternative to the latch function.
} Input S (status input)
The encoder's fault signal output can be connected to the status input. The module
transmits the input status to the head module with the status information.
4.1.2.2 Supply voltage for encoder
The module provides a supply voltage of 24 VDC / 100 mA to supply the rotary encoder.
The output is short circuit­proof. In the event of an overload, the supply voltage is switched
off and a warning is issued on the bus. The supply voltage is re­established when the
cause of the overload has been rectified.
4.1.2.3 Overflow
In both operating modes the counter can accept values from 0000 0000
H
to FFFF FFFF
H
.
} With an underflow the value drops below 0000 0000
H
and the counter continues from
FFFF FFFF
H
.
} With an overflow the value FFFF FFFF
H
is exceeded and the counter continues from
0000 0000
H
.
The overflow or underflow is signalled to the head module as status information.
The status information overflow is reset:
} if the value again falls below 0000 0000
H
(underflow).
} if 5555 0000
H
is exceeded (the lower third of the value range).
The status information underflow is reset:
} if FFFF FFFF
H
is exceeded again (overflow).
} if AAAA FFFF
H
is exceeded (the upper third of the value range).
4.1.3 Incremental encoder operating mode
The counter outputs and the output for the incremental encoder's zero pulse are connected
to the single­pole inputs (A, B, C).