Siemens SINUMERIK 840D Description Of Functions page 63

11.03
active until the timer has expired and the user cancels the "test stop selection"
signal at the PLC SGE.
The checkback signal is returned via the PLC SGA "pulses cancelled status".
This checkback signal must have been made before the timer, started at the
beginning, has expired. If this is not the case, then "STOP A" is initiated.
The PLC is able to activate the test stop in the NCK monitoring channel if the
checkback signal at the PLC SGA "pulses cancelled status" is appropriately
programmed to a PLC output.
Requirement:
There is a connection between this PLC output and the NCK SGE "test stop
selection".
The pulses must be enabled again before the test stop in the NCK monitoring
channel is selected.
Pulse cancellation via terminal 663 is requested in the NCK monitoring
channel
(Refer to Fig. 3-3 "Shutdown path of NCK CPU") via the NCK SGE "test stop
selection". The timer "pulses cancelled status" is started, the NCK SGA "enable
pulses" output and the message "test stop in progress" is displayed on the
screen.
The checkback signal is returned via the NCK SGE "pulses cancelled status"
(received via terminal AS1/AS2). This checkback signal must have been made
before the timer, started at the beginning, has expired. If this is not the case,
then "STOP A" is initiated.
The internal pulse cancellation is also requested
via the NCK-SGE "test stop selection" for the NCK monitoring channel, the
NCK-SGA "enable pulses" is not connected to terminal 663 however (refer to
Fig. 3-4 "Shutdown path of NCK-CPU via internal pulse cancellation").
The external pulse cancellation must also be tested via terminal 663.
Testing the external The external pulse cancellation test is started by setting the SGE "test stop
pulse cancellation external shutdown" on a single channel only for the NCK. The SGE must be
assigned to either the NCK periphery or the SPL using machine data 36979:
MA_SAFE_STOP_REQUEST_EXT_INPUT. A possible configuration for this is
shown in Fig. 3.5. When the NCK-SPL is used, the specification for single-
channel SI-specific signals from the PLC described in Chapter 3.10.10 can be
used.
The external pulse cancellation only has to test that the wiring connected to
terminals 663 is still correct for the configured drive modules. Furthermore, the
test stop is required because internal pulse cancellation is now used as shown
as an example in Fig. 3-5 for the first 2-axis module with axes X and Y.
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
3 Safety-Related Functions
3.1 Basic mechanisms of SI functions
3-63