Pilz PSSu K F INC - Manual (Page 17)

Function description
Operating Manual PSSu K F INC
1001688­EN­06 17
Key to timing diagram:
Section Function
Procedure for PSSu in system environ­
ment B
a Activate latch function In the user program, set Out­
putData.LatchOrMeasure
b Fill latch memory Rising edge at input L: Counter status is
transferred to the latch memory
c Output counter status
Set status bit
Counter status is written in In­
putData.LatchOrPeriod
The module sets InputData.LatchOrMeas­
ureDone
d Finish latch function In the user program, reset Out­
putData.LatchOrMeasure
e Ready for new latch func­
tion The module resets InputData.LatchOrMeas­
ureDone
The contents of the latch memory remains in the process image of inputs until the module
signals a new memory value by setting the status information. Before the initial transfer the
process image of inputs contains 0000 0000
H
or FFFF FFFF
H.
The module always transmits the counter status when the first latch pulse occurs after the
function has started. All subsequent latch pulses are ignored until the function is completed
and reset.
4.1.5.3 Transfer counter status via zero pulse
The output for the incremental encoder's zero pulse is connected to input C (C+/C­). An in­
cremental encoder typically supplies one zero pulse per rotation. Using the zero pulse func­
tion it is possible to record the last counter status before the zero pulse and transmit it via
the process image of inputs.
INFORMATION
In "Counter" operating mode, a rising edge at input C stops the counter.
a b
PIO
C
PII
c d e
Legend:
} PIO: I/O datum OutputData.ZeroPulseActive
} C: Input C