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plc s7-300 vietnam pro1_12e_obs
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SITRAIN Training for
Automation and Drives
ST-7PRO1
Page 1 Organization Blocks
Contents Page
Objectives ......................................................................................................................................... 2
Overview of the Organization Blocks ….......................................................................................... 3
Startup OBs ..................................................................................................................................... 4
Interrupting the Cyclic Program ………........................................................................................... 5
Time-of-Day Interrupt (OB10) .......................................................................................................... 6
Cyclic Interrupt (OB35) ...................................................................................................................... 7
Hardware Interrupt (OB40) .............................................................................................................. 8
Time-Delay Interrupt (OB20) ............................................................................................................ 9
The Diagnostic Interrupt and Asynchronous Error Interrupt (OB81 to OB87) .................................. 10
Asynchronous Error OBs .................................................................................................................. 11
Synchronous Errors .......................................................................................................................... 12
System Functions for Controlling Interrupt OBs ............................................................................... 13
OB Start Information ….................................................................................................................... 14
Exercise: Displaying the Startup Type (OB100) .............................................................................. 15
Exercise: Response to a Synchronous Error ................................................................................... 16
Date: 25.07.2008
File: PRO1_12E.1
SIMATIC® S7
Siemens AG 2003. All rights reserved.
SITRAIN Training for
Automation and Drives
Organization Blocks
Operating
system
OB1
FC
FB
SFC
SFB
Other
OBs
FC
FB