Delta Electronics AH500 Manual page 244

output pin. The Busy output pin and the Done output pin in a function block indicate the state of the
motion control function block. If the execution of motion control function block is to be interrupted by
another motion control function block, the Aborted output pin will be added to the motion control
function block. Besides, the Error output pin in a motion control function block is used to indicate
that an error occurs in the motion control function block when the motion control function block is
executed.
A motion control function block has not only the Execute input pin/the Enable input pin, but also
value/state input pins. The characteristics of the value/state input pins are described below.
 Use of input values:
 If the input pin that a motion control function block has is the Execute input pin, values are
used when there is a transition in the Execute input pin's signal from low to high. If a new
value is created, it becomes valid when the Execute input pin is triggered again.
 If the input pin that a motion control function block has is the Enable input pin, values are
used when there is a transition in the Enable input pin's signal from low to high. Compared
with the Execute input pin, the Enable input pin is used more often when a value used is
updated repeatedly.
 An input value exceeds a range.
After a motion control function block is started, the input values which are not in ranges allowed
will be limited, or result in an error occurring in the motion control function block. If an error
occurring in a motion control function block results in an error occurring in an axis, the motion
control function block is applied incorrectly. Users should prevent incorrect values from being
generated in an applied program.
 Output pins are mutually exclusive.
 If the input pin that a motion control function block has is the Execute input pin, only the
Busy output pin, the Done output pin, the Aborted output pin, or the Error output pin can be
set to True. If the Execute input pin is set to True, the Busy output pin, the Done output pin,
the Aborted output pin, or the Error output pin must be set to True.
 If the input pin that a motion control function block has is the Enable input pin, the Valid
output pin and the Error output pin are mutually exclusive, and only the Valid output pin or
the Error output pin can be set to True.
 Time when output data/states are valid
 If the input pin that a motion control function block has is the Execute input pin, the Done
output pin, the Error output pin, the Aborted output pin, and data output are reset when
there is a transition in the Execute input pin's signal from high to low, but the execution of
the function block does not stop when there is a transition in the Execute input pin's signal
from high to low. Even if the Execute input pin in a motion control function block is reset
before the execution of the motion control function block is complete, output states will still
be generated and retained for one cycle. If a motion control function block is started again
before the execution of the motion control function block is complete, the motion control
function block will not give feedback to the Done output pin and the Aborted output pin, and
an error will occur.
 If the input pin that a motion control function block has is the Enable input pin, the Valid
output pin, the Busy output pin, and the Error output pin are reset when there is a transition
in the Enable input pin's signal from high to low.
 Characteristic of the Done output pin
The Done output pin in a motion control function block will be set to True after the motion control
function block is executed successfully.
 Characteristic of the Busy output pin
 If the input pin that a motion control function block has is the Execute input pin, the motion
control function block uses the Busy output pin to indicate that the execution of the motion
control function block is not complete, and new output states (values) are expected to be
generated. The Busy output pin is set to True when there is a transition in the Execute input
pin's signal from low to high. When the Done output pin, the Aborted output pin, and the
Error output pin are set to True, the Busy output pin are reset.
 If the input pin that a motion control function block has is the Enable input pin, the motion
control function block uses the Busy output pin to indicate that the execution of the motion
control function block is not complete, and new output states (values) are expected to be
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Ch ap te r 5 Ap plie d Instruc tions