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Clock of 1Hz in STEP7 proct.

Created by: Aymen A at: 10/27/2011 4:35 PM (3 Replies)

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10/27/2011 4:35 PM	Rate (0)
Aymen A Advanced Member Joined: 9/11/2011 Last visit: 6/20/2022 Posts: 52 Rating: (0)	Good afternoon Please how can I insert a clock frequency of 1 Hz in a STEP7 project V5.4. If possible, describe for me the steps to configure the clock. And thank you in advance.

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10/27/2011 4:55 PM	Rate (0)
Aymen A Advanced Member Joined: 9/11/2011 Last visit: 6/20/2022 Posts: 52 Rating: (0)	/tf/WW/en/Posts/33261 This thread contain the solution.

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10/27/2011 5:06 PM	Rate (0)
MM1234 Posts: 270 Rating: (52)	Hello Aymen A, I don't know if this would help, but frequency of 1 Hz means each 1 second (f = 1 / T). Since I don't think you want to have a CPU clock cycle 1 second :D, I would guess that what you need is a cyclic interrupt, which means you can use either OB32 (1000 mscyclic interrupt)or OB35 (cyclic interrupt which you can set up for 1000 and has higher priority than OB32, idk if that could be of any use). Either way, you find what OBs are for what interrupts in the hardware config, click right button on your CPU, there go into Object properties and find the tab Cyclic Interrupts. You also gotta check if the interrupt is availabe for your CPU, because it varies and you might have only OB35 there for example. Other than that, I think you just make your codeof OB for particular cyclic interrupt, copy itto the CPU and you are good to go (and eventualy fix the settings for OB35 in hardware config).
MM1234 Posts: 270 Rating: (52)
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10/27/2011 5:10 PM	Rate (0)
MM1234 Posts: 270 Rating: (52)	Aymen A /tf/WW/en/Posts/33261 This thread contain the solution. Glad you found it, because I would never guess that this is in fact what you are asking for.
MM1234 Posts: 270 Rating: (52)
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