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Weekly Sequence Rotation of 4 Outputs

10/7/2008 11:55 PM	Rate (0)
Ian J Member Joined: 10/6/2008 Last visit: 8/2/2020 Posts: 1 Rating: (0)	Hi all, firstly thanks in advance for any help recieved from this post - it's very appreciated.. I've got a project running at the moment which uses a 0-10v temp sensor to ramp up and down a PI loop to bring in 4 boilers to a setpoint.. I've got this far and it works fine, but I'm looking to duty rotate the 4 boiler "Q" ouputs every week - so 1 boiler in turn is lead each week, with the rest as lag boilers... I don't know if it's me being abit thick, but it's driving me mad!!! Can anyone help?? Regards, Ian.

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10/8/2008 9:43 AM	Rate (0)
Fux Posts: 661 Rating: (123)	Hi, you could use a shift register. Please find the attached 0BA6 file. I connected also a switch to simulate the weekly pulses... In the first cycle the shift register gets activated (+B003) by using startup flag M8, then it gets deactivated again, when the first S-bit is ON. If the sequence is at the end (when S4 is ON) B003 gets set and it starts again. If you need more support, please attach your program. Attachment Shift register.zip (884 Downloads)
Fux Posts: 661 Rating: (123)
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