Siemens SINUMERIK 840D Description Of Functions page 62

3 Safety-Related Functions
3.1 Basic mechanisms of SI functions
operating personnel enter the dangerous zone (e.g. when the set-up mode is
selected) if the shutdown paths had not been tested within the last eight hours.
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Requirements for the
test stop
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Which SGEs/SGAs The following SGEs/SGAs are needed in each monitoring channel and for each
axis/spindle for the purpose of the test stop:
are needed for the
test stop?
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Signal The message "test stop in progress" is displayed on the screen while a "test
stop" is being executed.
Test stop sequence The test stop can be initiated by the hardware by pressing a button or from the
PLC user program using a function block that has been created (refer to
Chapter 7, "Engineering example").
Pulse cancellation is requested in the drive monitoring channel (refer to
Fig. 3-2, "Shutdown path of drive CPU") via the PLC SGE "test stop selection".
The timer "pulses cancelled status" is started and the message "test stop in
progress" is displayed on the screen. The pulse cancellation signal remains
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SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
Note
The time for the "shutdown path test" must be defined by the machine
manufacturer in a "test block".
All of the drives on the drive module, on which the drive to be tested is
configured, must be at a standstill.
The pulses must still be enabled at the start of the test.
The manufacturer must ensure that hanging (vertical) axes are securely
locked and cannot drop.
When the test stop is selected, the "status pulses cancelled" signal may
not be present at the PLC SGA or the "status pulses cancelled" signal at
the NCK SGE, otherwise, stop response STOP F will be activated.
For a test stop in the NCK monitoring channel
NCK SGE "test stop selection"
NCK SGE "pulses cancelled status"
NCK SGA "pulses enabled"
For a test stop in the drive monitoring channel
PLC SGE "test stop selection"
PLC SGA "pulses cancelled status"
For a test stop in the NCK monitoring channel for internal pulse disabling:
NCK SGE "test external pulse cancellation"
NCK SGE "externally enable pulses"
Note
To ensure that the shutdown paths have been tested correctly, the "test stop"
must be executed twice, once for the drive and once for the NC. In this way, it
can be ensured that each channel is operating correctly up to the point that
the pulses are cancelled.
For a 2-axis control module, the shutdown path must be tested for specific
axes, i.e. for each axis on the module.
© Siemens AG 2003 All Rights Reserved
11.03