Pilz PSSu K F INC - Manual (Page 16)

Function description
Operating Manual PSSu K F INC
1001688­EN­06 16
Key to timing diagram:
Section Function
Procedure for PSSu in system environ­
ment B
a Start measurement In the user program, set Out­
putData.LatchOrMeasure
b Output measured value
Set status bit
Measured value is written in In­
putData.LatchOrPeriod
The module sets InputData.LatchOrMeas­
ureDone
c Finish measurement In the user program, reset Out­
putData.LatchOrMeasure
d Ready for new measure­
ment The module resets InputData.LatchOrMeas­
ureDone
The result of the last period length measurement remains in the process image of inputs
until the module signals a new measurement result by setting the status information. Before
the initial measurement the process image of inputs contains 0000 0000
H
or FFFF FFFF
H
.
The module issues the result of period length measurement in multiples of 200 ns.
Example:
} The process image of inputs contains 32
H
/50
D
} The period length is 200 ns x 50 = 10 μs
4.1.5.2 Transfer counter status via latch pulse
A signal output can be connected to input L on the module for a latch pulse. The latch pulse
may come from a PLC or position switch, for example. Using the latch function it is possible
to record and transmit the counter status at the time of this latch pulse.
Prerequisite: This function is configured in PAS4000.
a b
PIO
L
PII
c d e
Legend:
} PIO: I/O datum OutputData.LatchOrMeasure
} L: Input L for external latch
} PII: I/O datum InputData.LatchOrMeasureDone