Parameterization and configuration
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6.2.5 Preset function
Danger of physical injury and damage to property due to an actual value
jump during execution of the preset adjustment function!
The preset adjustment function should only be executed when the
measuring system is stationary, or the resulting actual value jump must be
permitted by both the program and the application!
The measuring system can be adjusted to any actual position value in the value range of 0 to
(measuring range in steps – 1) using this function. If an invalid preset value outside the measuring
range is transmitted, the bit 7 Warning present is set in signal 81 ZSW2_ENC and the preset
execution is rejected. In order to delete the warning, a valid preset value must be transmitted.
The preset function is controlled via bits 11 Preset mode and 12 Execute preset in the control
word G1_STW (Chapter 6.2.1.6 on Page 37) and acknowledged via bit 12 Preset function is
executed in status word G1_ZSW (Chapter 6.2.1.7 on Page 38).
In the default setting the preset value parameter has a value of 0. This value can be changed via
acyclic data exchange using PNU 65000, see Chapter “Acyclic parameter access (Base Mode
Parameter Access - Local)” from Page 53.
Preset mode = absolute, current preset value e.g. = 0:
Set bit 11 and 12 in control word G1_STW to 0. The current actual position value 12 is set to the value
0 with a rising edge 0->1 of bit 12 in control word G1_STW.
The preset execution is acknowledged in the status word G1_ZSW by setting bit 12. In order to
conclude the preset execution, bit 12 must be reset again in the control word G1_STW. Bit 12 is then
also automatically reset in the status word G1_ZSW.
The internally calculated offset value can be read via acyclic data exchange using PNU 65001.08,
see Chapter “Acyclic parameter access (Base Mode Parameter Access - Local)” from Page 53.
Preset mode = relative, current preset value e.g. = 1000, current position e.g. = 4000:
Set bit 11 to 1 and bit 12 to 0 in the control word G1_STW. The current actual position value 4000 is set
to the value 5000 with a rising edge 0->1 of bit 12 in control word G1_STW.
The process then continues as described above.
6.2.6 Warnings, errors, diagnosis
A number of diagnostic mechanisms are available for monitoring the measuring system functions. The
following table shows an overview of the various options.
The measuring system errors are divided into faults and warnings:
● An error is reported if a malfunction in the measuring system leads to an incorrect position output
● A warning indicates that one or more internal measuring system parameters have been exceeded.
Unlike error messages, warnings do not lead to an incorrect position output.
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