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9-93
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
9.8.1
Function Description for Digital Inputs
The control signals of the axis include the start signal which triggers a posi-
tioning operation in “Reference point approach”, “MDI” and “Automatic”
modes. A logical OR is established with the “External Start” digital input and
the control signal (ST).
External start is connected to digital input I1.
Control signal (Start)
ST
dig. “External start” input
1
2
3
w
1
1
2
3
Input I1 not inverted (MD36)
Input I1 inverted (MD36)
Example
Minimum signal length at the digital input:
w
2
@
FM cycle
The enable input signal must be set, if defined in MD34, for a positioning
operation/movement/output of the axis to take place. A reset stops the move-
ment (external movement enable).
S
In the “Jogging” and “Control” modes, the movement of the axis pro-
ceeds as long as the AND link continues between the control signal
(
R+/R–
)
and the enable input.
Positioning
R+ or R–
Enable
1
2
3
&
1
2
3
Example
S
In the other modes, note the following:
If the enable input is still not enabled after a start edge, the start edge is
stored internally and “waiting for enable” is indicated by the checkback
signals. When the input is set, movement begins and the stored Start edge
is deleted (a Stop likewise deletes the stored Start edge).
External Start
Enable Input
Description of Functions
Summary of Contents for SIMATIC FM 453
Page 6: ...vi FM 453 Servo Drive Step Drive Positioning Module C79000 G7076 C453 01 Preface ...
Page 14: ...xiv FM 453 Servo Drive Step Drive Positioning Module C79000 G7076 C453 01 Table of Contents ...
Page 378: ...Index 6 FM 453 Servo Drive Step Drive Positioning Module C79000 G7076 C453 01 Index ...