I was wondering if allen Bradley had a clock bit option like Siemens does. I have a 1 hertz clock bit on the siemens version and was wondering if AB had the same option. If not, whats the best way to pulse a 1 hertz frequency. I know timers is one way. Just looking for a fast way to do so.
Clock bit on Allen Bradley?
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Ken Roach
Lifetime Supporting Member + Moderator
It should take about thirty seconds to put in a self-resetting timer and a comparison statement; that's what I would do.
Otherwise, all MicroLogix and SLC family controllers have a free-running clock based on the controller's crystal oscillator that is stored in the Status data file in word S:4.
The individual bits of that clock can be used as 50% duty cycle flashers.
Because they're based on the crystal and not on the real-time clock, they don't have an exact 1 Hz period. Bit S:4.07 will be on for 1.28 seconds and off for 1.28 seconds.
Don't try to use the Real Time Clock (RTC) data file for a 1 Hz flasher; the Seconds value is only updated every two seconds so you never see any odd numbers.
Otherwise, all MicroLogix and SLC family controllers have a free-running clock based on the controller's crystal oscillator that is stored in the Status data file in word S:4.
The individual bits of that clock can be used as 50% duty cycle flashers.
Because they're based on the crystal and not on the real-time clock, they don't have an exact 1 Hz period. Bit S:4.07 will be on for 1.28 seconds and off for 1.28 seconds.
Don't try to use the Real Time Clock (RTC) data file for a 1 Hz flasher; the Seconds value is only updated every two seconds so you never see any odd numbers.
Thanks Ken, it looks like I will be sticking with the timers as well. Seems like a safer bet without having to mess around with the setting all that much.
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