11.03
3 Safety-Related Functions
3.1 Basic mechanisms of SI functions
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
3-61
Timer
"Pulse
disabled
status"
Outputs
Inputs
STOP A
NCK-CPU
SGE Test stop selection
Drive bus
Drive closed-loop control
Terminal 663
AS1
+5V
0V
Safety
relay
AS2
+24V
0V
0V
Start
Relay
drive_IMP
(via NCK I/Os or SPL)
Enable SGA pulses external
>=
SGE Test external pulse disabling
(via NCK I/Os or SPL)
&
>=
&
Pulses
disabled
status
External
pulse supression
Internal
pulse
suppression
Fig. 3-4
Shutdown path of NCK CPU via internal pulse cancellation
Activation is carried out by configuring the SGAs "enable pulses" and "enable
pulses externally" and the SGE "test stop external shutdown".
If bit 30 is set in $MA_SAFE_PULSE_ENABLE_OUTPUT, the pulses are
internally cancelled. In this case, MD
$MA_SAFE_EXT_PULSE_ENAB_OUTPUT must also be configured so that
the NCK has a further option for canceling pulses. However, this path is only
used if the internal pulse cancellation fails.
$MA_SAFE_PULSE_ENABLE_OUTPUT can still be configured on a hardware
output or in the SPL (refer to Chapter 3.10).
This can be used, for example, in order to initiate responses in the SPL while
canceling the pulses, and not having to wait until the state "pulses are
cancelled" has been detected.
3.1.3
Testing the shutdown paths
The test stop carries out a test of the entire shutdown path plus external wiring
for each monitoring channel. In the course of the test, the comparators and stop
modules of the two monitoring channels that are responsible for the stop
function are processed in succession. Also refer to Chapter 2.6.3 "Forced
checking procedure".
The shutdown paths must be tested (forced checking procedure) at a suitable
time after the machine has been powered-up and thereafter in set-up mode
once every eight hours. It is advisable to carry out the test before the protective
device is opened or
Activating
Description
When must a test stop
be carried out?