Siemens SIMATIC FM 453, Руководство пользователя

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9-81
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
9.7.3 Stepper Motor Control System
In open-loop controlled operation of the stepper motor, the axis is driven via
the frequency output of the pulse/direction interface with “counted” distance
increments and without following error. This results in the maximum dynam-
ics possible for the movement, because when the target position is reached
via interpolation, setpoint value output to the step drive is also terminated.
Error signals
Position
comparitor
From interpolation
Backlash
compensation
Diagnosis
To actuating signal driver
Target speed
Controller
ready
External zero
reference mark
MD37
From drive actuation
v(t
)
Fig. 9-11 Overview of stepper motor control system
Basic diagnostics
In all operating modes except Control mode, the “servo enable” signal is re-
quired for the duration of every traversing movement, irrespective of the pa-
rameter definitions. If the controller enable is not detected or is deactivated
during the movement, the “servo enable missing” message is triggered (see
Table 11-7, Class 3/No. 61).
In all operating modes except Open-loop control mode, the “controller
ready” signal is required for the duration of every traversing movement when
the parameter is active (MD37.2). If the servo ready is not detected or is
deactivated during the movement, the “servo not ready” message is triggered
(see Table 11-7, Class 3/No. 62).
Overview
Diagnostics
Description of Functions