Siemens SIMATIC S7-200 System Manual page 283

Enter jog parameters
Next, enter the JOG_SPEED and the JOG_INCREMENT values.
JOG_SPEED: The JOG_SPEED (Jog speed for the motor) is the maximum speed that can
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be obtained while the JOG command remains active.
JOG_INCREMENT: Distance that the tool is moved by a momentary JOG command.
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Figure 9-13 shows the operation of the Jog command. When the Position module receives a Jog
command, it starts a timer. If the Jog command is terminated before 0.5 seconds has elapsed, the
Position module moves the tool the amount specified in the JOG_INCREMENT at the speed
defined by SS_SPEED. If the Jog command is still active when the 0.5 seconds have elapsed, the
Position module accelerates to the JOG_SPEED. Motion continues until the Jog command is
terminated. The Position module then performs a decelerated stop. You can enable the Jog
command either from the EM 253 control panel or with a position instruction.
Speed
MAX_SPEED
JOG_SPEED
SS_SPEED
JOG_INCREMENT
JOG command active for
less than 0.5 seconds
Figure 9-13 Representation of a JOG Operation
Enter acceleration time
Enter the acceleration and deceleration times in the edit boxes
Enter jerk time
For single step moves enter the jerk time compensation. This provides smoother position control
by reducing the jerk (rate of change) in acceleration and deceleration parts of the motion profile.
See Figure 9-14.
Jerk time compensation is also known as "S curve profiling." This compensation is applied equally
to the beginning and ending portions of both the acceleration and deceleration curve. Jerk
compensation is not applied to the initial and final step between zero speed and SS_SPEED.
Open Loop Motion Control with the S7-200
JOG command terminated
JOG command active for
more than 0.5 seconds
Chapter 9
Distance
269