User Manual
E727T0005, valid for E-727
BRO, 2019-06-28
Physik Instrumente (PI) GmbH & Co. KG, Auf der Roemerstrasse 1, 76228 Karlsruhe, Germany
Page 90 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email
Example 4:
The same conditions as in example 3 are valid, but the positive input voltages range to +5 V.
MinNormalizedValue = 0
MaxNormalizedValue = +50
GAIN = (120 - 0)) / (50 - 0) = 2.4
OFFSET = 120 - 2.4 * 50 = 0
ScaledValue = 2.4 * NormalizedValue
Send:
SPA 4 0x02000200 0
SPA 4 0x02000300 2.4
Use as Control Value Generation Source
To enable the analog control input for an axis, an input signal channel must be connected to that
axis. This is done with the
ADC Channel For Target
parameter (ID 0x06000500). If the connection
of axis and input signal channel is saved as the power-on default, the axis can be commanded via
analog input immediately after controller start-up, and no host PC is required. Example: With an E-
727.3CDA, the input signal channel 4 (pins 2 and 9 of
Analog I/O
) is to be used to command axis 1.
Send:
SPA 1 0x06000500 4
to enable the connection in volatile memory. Note that in PIMikroMove, this parameter is available
in the
Target Manipulation 1
parameter group in the
Device Parameter Configuration
window.
When the analog control input is enabled for an axis, then it overwrites the values of all other
control sources for that axis except those from the AutoZero procedure. The AutoZero procedure
has the highest priority, i.e. it will overwrite the control values given by all other sources. When the
analog control input is enabled, it will be disabled automatically at the start of the AutoZero
procedure and reenabled again when AutoZero is finished. See "Control Value Generation" (p. 30)
for more information.
An offset value can be added to the analog input scaled value for an axis using the AOS command.
When no input signal channel is connected to an axis (i.e. the value of the
ADC Channel For Target
parameter is 0), the analog control input is disabled for that axis (including the offset set with
AOS).
When the analog input is used as control source and the axis motion is stopped with STP or #24,
the behaviour depends on the value of the
Disconnect Analog Target Input When Stopping
parameter (ID 0x0E001E00): 1 = the analog input channel is disconnected from the axis; 0 = the
analog input channel remains connected to the axis. If the analog input channel is disconnected
from the axis: To recommence commanding the axis via the analog input, the corresponding input
signal channel must be reconnected to the axis. See the description above.
When the analog input is being used as control source and the servo mode is switched off, the axis
motion will continue in open-loop mode.