Operating instructions

112 Application manual Positioning 04/08
4.13 Store the actual position value (latching function)
With the latching function the actual position value of the drive can be stored. With
a rising or falling signal edge at digital input S2IND the actual position value is
stored in the EEPROM and displayed via
Latched Position 1281.
Parameter
Operation Mode 1280 allows to set the storing of actual position value
to rising or falling signal edge.
Operation Mode 1280
Function
0 - Off The Latching function is switched off.
1 - S2IND Rising Edge
With a rising signal edge at digital input S2IND the ac-
tual position value is stored in the EEPROM and dis-
played via
Latched Position 1281.
2 - S2IND Falling Edge
With a falling signal edge at digital input S2IND the
actual position value is stored in the EEPROM and dis-
played via
Latched Position 1281.
The latched position is available as signal source:
−
Source “617 - Latched Position”, for example as actual position value for the posi-
tion comparator
−
Source “617 - Latched Position” for transmission via systembus (TxPDO Long) in
internal format
−
Source “618 - Latched Position (User-Units)” for transmission via systembus
(TxPDO Long) in user units
−
Source “1028 (in user units) … 1031 (in user units * 1000) for the scope function
The latched position is stored in the internal EEPROM during mains switch-off or
mains failure. This enables resuming of interrupted movements.
Note: The function is permanently linked to digital input S2IND, parameterization
on another digital input is not possible.
Consider the assignment of the digital input S2IND to other functions (for example
to
Start Positioning 1222) for the usage of the latching function. If applicable
change the parameter assignment and wiring.
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