Pilz PSSu E S INC - Manual (Page 23)

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: [email protected]
4-7
4.1 Module features
4 Function description
4.1.5.2 Transfer counter status via latch pulse
Transfer counter status via latch pulse 4- ][Funktionsbeschreibung_Ein ST-INC BA Latch
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 ex-
ample. 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 the PSSu Configurator /
PAS4000.
Key:
 PIO: Bit 1 of the byte for function calls in the process image of outputs
or I/O data OutputData.LatchOrMeasure
 L: Input L for external latch
 PII: Bit 1 of the status byte in the process image of inputs or I/O data
InputData.LatchOrMeasureDone
Key to timing diagram:
Section Function Procedure for PSSu in system envi-
ronment A Procedure for PSSu in system envi-
ronment B
a Activate latch function In the user program, set Bit 1 of the
function call In the user program, set OutputDa-
ta.LatchOrMeasure
b Fill latch memory Rising edge at input L: Counter status
is transferred to the 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 transferred to the
process image of inputs
The module sets Bit 1 of the status byte Counter status is written in InputDa-
ta.LatchOrPeriod
The module sets InputData.Latch-
OrMeasureDone
d Finish latch function In the user program, reset Bit 1 of the
function call In the user program, reset OutputDa-
ta.LatchOrMeasure
e Ready for new latch
function The module resets Bit 1 of the status
byte The module resets InputData.Latch-
OrMeasureDone
a b
PAA
L
PAE
c d e