Plc Md For The Operating System (System Data) - Siemens SINUMERIK 840C Installation Instructions Manual

09.95
8.2
You can use the organization blocks OB 5, OB 6 and OB 7 for time-controlled program
execution.
You can vary the time base by specifying a factor. This factor is specific to the block:
Blocks
OB 5
OB 6
OB 7
You must not specify zero as a factor.
If you want to use OB 5, set PLC MD 6051.0 to 0 to enable OB 5 to be invoked. See also
PLC MD 6050 (enable block for processing) and PLC MD6048 (processing delay).
The processing of timers causes a certain amount of work for the PLC operating system.
Should a user program require e.g. only timers 1 to 20, entry of the number 20 tells the
operating system that it should process only these timers. This saves processor time, and can
even reduce the PLC cycle time.
An entry of "-1" disables all timers.
The extension to 255 is only possible with option N05; otherwise 127 timers are available.
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
More user manuals on

PLC MD for the operating system (system data)

2
Default value Lower input limit
1
3
Default value Lower input limit
1
4
Default value Lower input limit
1
Normal time
base
2.5 ms
10 ms
100 ms
5
Default value Lower input limit
64
ManualsBase.com
8.2 PLC MD for the operating system (system data)
Time base for calling OB 5
Upper input limit
+1 3
Time base for calling OB 6
Upper input limit
+1 9
Time base for calling OB 7
Upper input limit
+1 255
Factor
1 to 3
1 to 9
1 to 255
Last STEP 5 timer
Upper input limit
-1 +255
6FC5197- AA50
8 PLC Machine Data (PLC MD)
DB 60
DW 2
Units
2.5 ms
DB 60
DW 3
Units
10 ms
DB 60
DW 4
Units
100 ms
DB 60
DW 5
Units
–
8–3