Delta AS Series Programming Manual page 1195

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c)
Operation of the negative limit
 Negative software limit position is set in HWCONFIG (by setting SR582 = –11,000 for example). After
downloading the setting to the PLC, the negative limit function starts.
 DDRVI starts to output 20,000 pulses in the negative direction. Note: the instruction does not output in the
negative direction if the negative limit is exceeded when the function starts.
 When the current position SR460 < the limit position SR582, the condition for the software negative limit function
is met.
 DDRVI instruction stops the output immediately and the negative limit alarm SM467 is ON.
 If the condition for the software limit function is not met, Y0.0 stops the output after -20,000 pulses.
d)
Rising-edge trigger
e)
SR related to the limit function
_6
Axis number
Positive software limit
position
Negative software
limit position
Positive output limit: the output stops immediately if the current position is greater than the positive limit position.
Negative output limit: the output stops immediately if the current position is less than the negative limit position.
When the positive and negative limits are both 0, the software limit function cannot start. Since the software limit
function checks the output position when the output instruction is scanned, stopping the output is affected by the
PLC scan. To quickly stop the output in real time, use the external input point as the limit point.
6 - 9 1 6
Limit function
Types
Descriptions
When started: from low to
high and maintains at high
Axis 1
SR580
SR581
SR582
SR583
Contact A
Rising-edge trigger
Axis 2 Axis 3
SR584 SR588
SR585 SR589
SR586 SR590
SR587 SR591
Contact B
Falling-edgetrigger
When started: from high to
low and maintains at low
Axis 4 Axis 5
SR592 SR596
SR593 SR597
SR594 SR598
SR595 SR599
Axis 6
SR600
SR601
SR602
SR603