Specifications

Operation

In OFFLINE mode, you can check the current voltage and position

values on the channel-specific screens.

3.2 Modes of Operation

Control mode: The piezo channels (amplifiers) of the control electronics

can be operated in either ONLINE or OFFLINE control mode. The active

mode determines the applicable control sources for the output voltage. See

"Control Modes" (p. 23) and see "Display Screens" (p. 21) for more

information.

Servo mode: The current servo mode determines if a motion axis is

driven in open-loop (servo OFF) or closed-loop (servo ON) operation. In

closed-loop operation a servo loop participates in the generation of the

control value for the piezo channel. The servo loop thus maintains the

current axis position, based on a given target position and the position

feedback of the corresponding sensor channel. See

"Servo Modes" (p. 24)

and "Control Value Generation" in the E-517 User Manual for more

information.

The individual control and servo modes can be combined arbitrarily. The

current states are visible on the main screen of the E-517 display.

3.2.1 Control Modes

The current control mode of a piezo channel determines the applicable

control sources for the output voltage and hence for the axis motion:

■ OFFLINE mode:

The output voltage depends on analog control input and DC offset

applied to the channel (e.g. a voltage applied to the CONTROL

INPUT socket; setting of the DC-OFFSET knob).

Move commands (received via interface or from a running macro),

wave generator output and trackball target settings are ignored and

may provoke an error message.

■ ONLINE mode:

The E-517 controls the generation of the output voltage. Target

values for the axis motion can be given by move commands

(received via interface or from a running macro), wave generator

output and trackball settings. Analog control input voltage and DC

offset settings are ignored.