Delta AS Series Programming Manual page 1193

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AS Ser ies Pro gra mm in g M anu al

 DDRVI outputs 20,000 pulses in the positive direction. Note: the instruction does not output in the

positive direction if the positive limit point is ON when the function starts.

 When the limit input point X0.6 is triggered by the external mechanism and is ON, the condition for the

hardware positive limit function is met.

 DDRVI instruction stops the output immediately and the positive limit alarm SM465 is ON.

 If the condition for the hardware limit function is not met, Y0.0 stops the output after 20,000 pulses.

Operation of the negative limit

 Negative limit input point X0.7 is set in HWCONFIG and is downloaded to PLC. When SM466 is set to ON,

the negative limit function starts.

 DDRVI outputs 20,000 pulses in the negative direction. Note: the instruction does not output in the negative

direction if the negative limit point is ON when the function starts.

 When the limit input point X0.7 is triggered by the external mechanism and is ON, the condition for the

hardware negative limit function is met.

 DDRVI instruction stops the output immediately and the negative limit alarm SM467 is ON.

 If the condition for the hardware limit function is not met, Y0.0 stops the output after -20,000 pulses.

SM flags related to the limit function

Enabling the

hardware positive

Positive limit alarm

Enabling the

hardware negative

Negative limit alarm

Note: The limit point alarm flag is read-only and is set or reset automatically by the PLC according to the state of

the start flag.

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