Basics On The Safety Functions Integrated In The System/Drive - Siemens SINUMERIK 840D sl Function Manual

Basics on the Safety Functions Integrated
in the System/Drive
Motion monitoring functions with a higher–level control
The motion monitoring functions are carried out using a higher–level control. The
higher–level control and the drive are the two monitoring channels. Just like the
monitoring functions integrated in the drive, also here, each channel must be as-
signed a shutdown path so that when a fault develops, the pulses can be cancelled
independently of the other channel.
S The shutdown path of the Control Unit is assigned to the drive monitoring
channel.
S The shutdown path of the Motor Module is assigned the control monitoring
channel.
5.1 Monitoring cycle
Setting the monitoring clock cycle time
The axial safety–related functions are monitored cyclically in the monitoring clock
cycle that can be set jointly for all axes/spindles using the following machine data:
for 840D sl
MD 10090: $MN_SAFETY_SYSCLOCK_TIME_RATIO
The specified clock cycle is checked and rounded–off to the next possible value
when the control boots and every time the machine data changes.
The resulting monitoring clock cycle is displayed using MD 10091:
$MN_INFO_SAFETY_CYCLE_TIME
(refer to Chapter 8.1.2, "Description of machine data").
for SINAMICS S120
p9500 SI motion monitoring clock cycle (Control Unit)
(refer to Chapter 8.2.2, "Description of parameters")
© Siemens AG 2008 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
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