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Workshop PG5 Project management 6.2 Cyclic Blocks (COB 0 ... 15) The fact that your SB is waiting on an event must under no circumstances block the rest of the program from being executed continuously. To prevent you from programming such a structure, a SB must be called from a COB. You can’t have a SB without a COB! The SB then will be called once a cycle and the state will be tested. If the SB is waiting on an event, then the program simply returns to the COB and continues to execute the COB. The next step of the SB will not be executed until the next cycle in which it is not in a waiting state. Cycle starts here Cyclic programs: Cycle time: Cycle ends here Until now our programs have been executed in an endless loop. They always started at the beginning of a COB and then one COB after the other was executed until the program reached the last COB. Once the program reaches the end, it automatically returns to the beginning of the first COB and starts the cycle all over again. The time it takes to execute all the COB’s from the beginning of the first COB to the end of the last COB, depends on the number and type of instructions and FBOX’s you use in your program. This time is called Cycle time. The cycle time is typically in the millisecond range. If you know the cycle time, then you know how long it takes for a PCD output to react on the change of the state of an input. Cyclic programs are built with program blocks like COB’s, PB’s, FB’s, SB’s or XOB’s. PG5-06-E.doc © Saia-Burgess Controls Ltd. Page 6-2
Workshop PG5 Project management 6.3 Open a new GRAFTEC file Sequential Blocks are drawn in the Graftec editor. As already mentioned, a SB must always be called from a COB. Therefore we need to open two new files: • First we need to create a file containing a COB which calls the SB. This can be a FBD file for a graphical program (chapter 4) or the COB can be programmed in an Instruction list program (chapter 7) • Second we have to open a Graftec file. Open a new project: Start with a new project: PG5-06-E.doc © Saia-Burgess Controls Ltd. Page 6-3
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Edition: 26/732E5 USERS GUIDE PCD P
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Workshop PG5 Welcome Introduction.
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3. PCD Resources INTRODUCTION: 1 3.
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