11.03 2 General Information about Integrated Safety Systems
2.13 Others
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
2-51
2.13 Others
2.13.1 Applications
The pulse enable command must be cancelled via drive terminal 663 before the
park state is activated (via interface signal "Park"). This can be done by means
of the NCK-SGE "Test stop selection" (the message "Test stop active" is then
displayed). The pulse enable signal may not be applied again until the park
state has been deselected. Pulses are cancelled via SGA "Enable pulses". The
pulses can be cancelled by selecting external stop A (corresponds to "Safe
standstill").
When the "parking" function is selected, actual value acquisition and the
position measuring system monitoring are de-activated for an axis/spindle. The
NCK actual value is frozen and mechanical actual value changes are no longer
detected. This also applies to the actual value acquisition of the two safety
monitoring channels NCK and 611 digital.
The absolute reference of an axis can therefore no longer be reliably detected.
The safety monitoring channels respond as follows:
− Alarms 27000/300950 are displayed "Axis no longer safely referenced"
− SGA "Axis safely referenced" cancelled on NCK and drive side.
The user can align the actual value acquisition of the safety monitoring
channels by referencing/synchronizing to the machine position. These alarms
are only displayed for axes for which safety monitoring functions with absolute
reference are activated, i.e. for SE and SN. They are not displayed for axes
without these monitoring functions.
Machine data SAFE_PARK_ALARM_SUPRESS can be used to suppress
Alarms 27000/300950.
The machine manufacturer must take various measures (refer to Chapter 2,
"System prerequisites") to prevent vertical axes from falling when the safe
standstill function is activated (e.g. after STOP B/A). This means that the
mechanical brake must be controlled as quickly as possible.
From SW 6.3.21, a function check of the mechanical braking system is carried-
out for all axes that must be held using a holding brake to prevent movement in
the open-loop controlled mode (refer to Chapter 8.3).
When the measuring systems are changed-over (selected) via interface signals
"Position measuring system 1" (DB 31..., DBX1.5)
"Position measuring system 2" (DB 31..., DBX1.6), the following applies:
The encoder used by the position controller is changed over.
Note
SI continues to work with the configured encoder.
Parking an axis
Parking axes with
absolute reference
Vertical axis:
Measuring system
changeover on 840D
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