Basics On The Safety Functions Integrated In The System/Drive; Monitoring Clock Cycle - 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 chan-
nel.
S The shutdown path of the Motor Module is assigned the control monitoring
channel.
5.1

Monitoring clock cycle

Setting the monitoring clock cycle time
The axial safety-relevant functions are monitored cyclically in the monitoring clock
cycle that can be set jointly for all axes/spindles using the following machine data:
with 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
(see Subsection 8.1.2 "Description of the machine data").
for SINAMICS S 120
p9500 SI motion, monitoring clock cycle
(see Subsection 8.2.2, "Description of the parameters")
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
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