Siemens SINUMERIK 840D Description Of Functions page 65

11.03
The state of the active monitoring function (SBH, SG, SE, SN) is not changed
by "test stop external shutdown".
Checkback signals, Since the SGE "status pulses cancelled" is only used for checking pulse
pulse cancellation cancellation for test stop or for "test stop external shutdown", this signal can be
configured according to the 3-terminal principle. In this way, the information for
(SW 6.3.21 and higher)
all 611 digital modules no longer has to be obtained by wiring the AS1/AS2
terminals to NCK I/Os. The 3-terminal principle is used in the form of a two-
channel pulse-cancellation control with single-channel feedback.
Activation The function is activated by configuring the SGE "status pulses cancelled". Up
to now, the assignment to an I/O input or to the NCK-SPL had to be made via
MD $MA_SAFE_PULSE_STATUS_INPUT. If this machine data is set to 0, the
information on whether or not the pulses have been cancelled is retrieved from
the SI interface of the 611 digital.
Testing the shutdown The test stop is executed internally in the drive monitoring channel (via the
paths for several axes NC/PLC interface). To implement the test stop for the NCK monitoring channel,
without SPL the SGEs/SGAs must be appropriately connected-up for each axis.
A large number of inputs and outputs are required in the NCK when there are
several axes. It is possible to group or distribute signals using inputs/outputs
assigned via machine data (refer to Chapter 4, "Data description").
To obtain the "test stop selection" signal of a certain axis, it must be possible to
evaluate the checkback signal "pulses cancelled status" for the same axis in
order to be able to detect if there are any errors.
Testing the shutdown For a dual-axis module, there is only one terminal 663 and one AS1/AS2 for
paths for a dual-axis both axes. The shutdown path in the NCK and drive monitoring channels must
module still be tested in succession for both axes.
The following example (refer to Fig. 3-6, "Testing the shutdown path") shows a
circuit for testing the shutdown path of the NCK with four axes, axes 3 and 4
being provided by a dual-axis module.
© 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
3-65