Siemens Simovert Masterdrives Compendium page 216

09.2008
DANGER
7.1.2.1 Time monitoring
Siemens AG 6SE7087-6QX70 (Version AK)
SIMOVERT MASTERDRIVES
Examples:
1. Function block 350 should be processed in time slot T4 before
function block 390:
U953.50 = 4
U953.90 = 4
U963.50 = 1000
U963.90 = 1010
2. Function block 350 should be processed in time slot T9 after
function block 390:
U953.50 = 9
U953.90 = 9
U963.50 = 1050
U963.90 = 1010
When the units are delivered, a processing sequence has already been
determined. You should adjust this to suit your requirements once you
have determined the interconnection of the function blocks.
Please note that an incorrect processing sequence will lead to
uncontrolled axis movements!
Depending on the number and frequency of the blocks to be processed,
the microprocessor system of the units has a varying degree of
utilization. In order to avoid any dangerous overloading, the operating
system has a time monitoring facility, which
♦ monitors the system for its overall workload
♦ monitors the various time slots to ensure they are being completely
processed within the allocated time
♦ generates alarms and fault messages if calculating times are not
adequate.
Compendium Motion Control
Functions
7-7