Siemens sinumerik 840D sl Function Manual page 545

Detailed description
2.6 Programming
2.6.6 Voltage offset definable by synchronized action
Syntax
$A_OUTA[
Number
Number of the parameterized analog output (see below: Parameterization)
• Format: Integer
• Range of values: 1, 2, . . .max. number of analog outputs
oltage offset
V
As with voltage offset with CLC_VOFF (see "Voltage offset, can be set on a block-specific
basis (CLC_VOFF)" section).
Functionality
A parameterizable output (system variable $A_OUTA) can be used to apply a voltage offset
for clearance control, which, like CLC_OFF, is subtracted from the input voltage of the
clearance sensor.
The voltage offset can be modified in the interpolation cycle by programming the analog
output within a synchronized action.
Parameterization
The following machine data is used to parameterize the analog output:
MD62522 $MC_CLC_OFFSET_ASSIGN_ANAOUT (modification of the setpoint distance by
means of sensor signal override)
Example
An external voltage Uext is present at analog input $A_INA[3], which is to be overlaid on the
sensor voltage as a continuously variable voltage offset e.g. for test or start-up purposes.
$A_OUTA[2] is used as an analog output for the clearance control voltage offset.
Parameter setting for the analog output for clearance control voltage offset:
MD62522 $MC_CLC_OFFSET_ASSIGN_ANAOUT = 2 (modification of the setpoint distance
by means of sensor signal override)
The analog input $A_INA[3] is assigned to the clearance control analog output $A_OUTA[2]
within a synchronized action:
ID=1 DO $A_OUTA[2] = $A_INA[3]
40
number oltage offset
] = V
Special functions: Clearance Control (TE1)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0