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5 Organization Blocks 11.92
5.3.1 Normal mode
5.3.1 Normal mode
In normal mode the cyclically processed program can only be interrupted at the block limits by
interrupt-controlled processing (Fig. 5.2). Only when a change is made from one block to
another - either by calling a new block or by returning to a higher-order block after a block end
statement - can the system program call up an organization block for interrupt servicing.
Organization blocks OB 2 and OB 5 cannot be called up in normal mode. If these blocks are
available in the user program and enabled via machine data (see Interface Description Part 1:
Signals, "PLC MD bits for basic program"), they are nevertheless not processed.
Fig. 5.2 Point of interruption of the cyclically processed program in normal mode
JU PB 3
JU PB 13
JU FB 5
PB 13
BE BE BE
BE
FB 5PB 3OB 1
Point of interruption
at which interrupt servicing can be erfolgen
5.3.2 Response time
In normal mode interrupt-controlled processing cannot normally take place while a block is
being processed. An interrupt is only serviced on a block change, i.e. when a block is called or
terminated. The maximum response time between an interrupt occuring and being serviced is
therefore, in the worst case, the processing time of the longest block. If two alarms occur
simultaneously, the response time for the interrupt increases for the interrupt with lower
priority. First the cyclic program is processed up to the next block change and then the
processor processes the "interrupt service routine" with the highest priority. Once the
"interrupt service routine" with the higher priority has been completed, the "interrupt service
routine" with lower priority is then processed. The response time of this lower-priority program
has thus been increased by the processing time of the higher-priority program (see Section
"Priority assignments for interrupts").
If several interrupts occur simultaneously, the interrupt with the lowest priority is only serviced
when all higher-priority interrupts have been serviced.
The priorities of an interrupt-controlled processing can be shifted if an interrupt occurs while an
interrupt-controlled program is being processed. After completion of the servicing of the higher-
priority interrupt, the priorities are reassigned, causing the response time for the lowest-priority
interrupt to be further increased.
5–4
© Siemens AG 1992 All Rights Reserved 6FC5197- AA80
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
Prodotti e manuali riguardandi Generatori elettrici Siemens 880
Generatori elettrici Siemens v1.0 Manuale Utente
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