Hello all. I just repied this thread below. But i decide to post a new topic hoping more people will read it. The link of the similar topic is shown below:
http://www.plctalk.net/qanda/showthread.php?t=20918
I am using siemens step 7 to do a airport project. I am working on an baggage handling system with 18 check in counters to merge to the main conveyour. I am to use a technique called "window reservation" for the merges. Once the baggage is moved to the induction conveyor, the control system will look for available space on the take away conveyor to create a virtual window. The virtual window is detected by a sensor installed 1m upstream for every check in counter. ( No encoder is used and the main belt travel at constant speed) And we want to release the baggage once a 1.75m window is created. All the counters have equal opportunity to create the virtual window, the induciton of baggage onto the wirtual window is based on 1st com 1st served basis.
I have read some related topics but still not very sure about the method to use. some people say should use shift registers while others say use FIFO. I am using siemens step7 and quite new to this software, which one shall i choose? how to apply to my project? if use shift register, shall i use one shift register for all counters or one register one counter? Is FIFO useful to my project?
Thanks a lot for the help. Waiting for your reply.
http://www.plctalk.net/qanda/showthread.php?t=20918
I am using siemens step 7 to do a airport project. I am working on an baggage handling system with 18 check in counters to merge to the main conveyour. I am to use a technique called "window reservation" for the merges. Once the baggage is moved to the induction conveyor, the control system will look for available space on the take away conveyor to create a virtual window. The virtual window is detected by a sensor installed 1m upstream for every check in counter. ( No encoder is used and the main belt travel at constant speed) And we want to release the baggage once a 1.75m window is created. All the counters have equal opportunity to create the virtual window, the induciton of baggage onto the wirtual window is based on 1st com 1st served basis.
I have read some related topics but still not very sure about the method to use. some people say should use shift registers while others say use FIFO. I am using siemens step7 and quite new to this software, which one shall i choose? how to apply to my project? if use shift register, shall i use one shift register for all counters or one register one counter? Is FIFO useful to my project?
Thanks a lot for the help. Waiting for your reply.
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