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11.92 5 Organization Blocks
5.3.6 Priority assignment for interrupts
5.3.6 Priority assignment for interrupts
If several interrupts occur simultaneously, the interrupts are processed in the following
sequence:
Increasing priority
OB 1
OB 7
OB 6
OB 5
OB 4
OB 3
OB 2
cyclic processing
time-controlled processing
aperiodic processing
interrupt-controlled processing
OB 2 and OB 5 are only processed if PLC machine data bit 6051.0 is 0 (Special mode see
Installation Guide, "PLC MD bits for basic program").
If the cyclic program is interrupted by an interrupt, all interrupts present are serviced before
cyclic program processing is continued. This applies both to interrupts which cause interruption
of cyclic operation and all interrupts which occur during interrupt servicing. Hereby after the
processing of each interrupt service routine, the interrupt with the next highest priority is found
and processed.
5.4 Programming the cyclic program
A programmable controller's program is "normally" scanned cyclically (Fig. 5.4). The
processor starts at the beginning of the STEP 5 program, scans the STEP 5 statements
sequentially until it reaches the end of the program, and then repeats the entire procedure.
5.4.1 Interface between system program and cyclic program
Organization block OB 1 is the interface between the system program and the cyclic user
program. The first STEP 5 statement in OB 1 is also the first statement in the user program,
i. e. is equivalent to the beginning of the cyclic program.
The program, sequence and function blocks comprising the cyclic program are called in
organization block 1. These blocks may themselves contain block calls, i. e. the blocks can be
nested (see Section "Program organization").
© Siemens AG 1992 All Rights Reserved 6FC5197- AA80 5–9
SINUMERIK 840C/880 (PJ)
- SINUMERIK 840C 1
- SINUMERIK 880/880 GA2 1
- PLC 135 WB/WB2/WD 1
- SINUMERIK 2
- documentation 3
- Preliminary Remarks 4
- Contents 5
- 1 Introductory Remarks 8
- 1.3 Programming 9
- 1.3.1 Program structure 9
- 1.3.2 Program organization 10
- 1.3.3 Program processing 11
- 1 Introductory Remarks 12.93 13
- 2 Program Blocks 14
- 2.2 Calling program blocks 15
- 3 Data Blocks 16
- 3.2 Calling data blocks 17
- 3 Data Blocks 11.92 19
- 4 Function Blocks 20
- 4.2.1 Block header 21
- 4.2.2 Block body 21
- 4.3.1 Call statement 22
- 4.3.2 Parameter list 22
- 4.4.1 Library number 23
- 4.4.4 Block parameter types 24
- 5 Organization Blocks 27
- 5.2 Overview 28
- 5.3 Points of interruption 29
- 5.3.1 Normal mode 30
- 5.3.2 Response time 30
- 5.3.3 Special mode 31
- (LIM/SIM) 31
- 1) SINUMERIK 880 only 33
- PLC 1 PLC 2 34
- 11.92 5 Organization Blocks 39
- 5 Organization Blocks 12.93 40
- V Block type Block number 45
- 6 Start-up 46
- 6 Start-up 12.93 47
- 6.1 Self-diagnostics program 47
- 11.92 6 Start-up 48
- 6.3 User data blocks 49
- 6.4 Timeout analysis 49
- 7 Device Error Analysis 50
- 7.1 Interrupt stack 51
- 7.2 Detailed error code 54
- 8.1 Segment allocation 56
- 1) SINUMERIK 880, SW 6 57
- 8.1 Segment allocation 58
- 8.2 Segment switch 59
- 8.3 Block lists 59
- 8.3 Block lists 60
- Examples 61
- 9.2 Basic operations 64
- 9.2.2 Storage operations 67
- 1) Not for transfers 70
- 2) PII: Process input image 70
- 3) PIQ: Process output image 70
- 9.2.5 Comparison operations 80
- 9.2.6 Block calls 84
- 9.2.7 Code operations 86
- 9.2.8 Arithmetic operations 87
- 9.2.9 Other operations 88
- 9.3.2 Setting operations 89
- 9.3.8 Shift operations 95
- 9.3.9 Conversion operations 96
- 9.3.11 Jump operations 97
- 9.3.11 Jump operations 98
- 9.3.12 Processing operations 100
- 9.3.12 Processing operations 101
- SINUMERIK 840C/880 (PJ) 101
- 9.3.14 Other operations 103
- 9.3.14 Other operations 104
- 10.1 General 106
- AND-boxes 109
- Fig. 10.20 Connector for CSF 119
- 11 Hardware 122
- 12.93 11 Hardware 126
- Programmer 127
- 12.3 START PLC 128
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