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1.3 The fundamentals of motion control
Stepper motor control (C230-2, C240)
In addition to the analog setpoint outputs, the C230-2/C240 has pulse outputs for up to four
stepper motor axes. The stepper motor is controlled by means of cycle clocks, the number of
which determines the position and the frequency of which determines the rotational speed
(velocity). The actual position value is not measured during controlled operation; the position
controller takes the number of pulses output (position setpoint) as the actual value. With this
type of control circuit, the motor cannot lose any steps in order to enable exact positioning.
Figure 1-7
Position-controlled stepper motor control (C230-2, C240)
The C230-2, C240 also provide the option of using one encoder input per axis to operate
stepper motors in closed-loop position control as a servo axis.
Figure 1-8
22
Controlled stepper motor system with control circuit
Position-controlled stepper motor system with control circuit
SIMOTION C
Operating Instructions, 02/2012
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