Once again, there's nothing wrong with that, but you should experiment with the TMR instruction to understand the difference.įinally, at this stage of your learning, don't worry about trying to combine things into a single rung. Third, the way you set up the enable and reset nodes of your ONDTR timer on rung 3 makes it work the same as the TMR instruction. In fact, your rungs give you the ability to modify the on and off times by varying the presets of the two timers. Not that there's anything wrong with that. Second, your rungs 2 and three have duplicated the operation of the T_SEC variable I referred to in my earlier post. In so doing, you have made it the equivalent of the built-in %S0007 variable. That's as much as I'm willing to offer until you show us an example of what you've done.įirst, you have provided no way to turn %M00001 off. While the first timer is done, but before the second timer is done, turn the lamp on continuously, and then turn it off when the second timer is complete. Use the timer's completed state to enable a second timer with a preset of 10 seconds.
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While that timer is enabled, but not yet completed, use the T_SEC contact to flash your lamp on and off. That would be 300 tenths of a second or 3000 hundredths of a second. Use the internal to start a timer with a preset of 30 seconds. You'll need to keep that bit turned on following the first scan. Use the FST_SCN bit to turn on an internal bit. You can find it in the variable declarations table. There is another internal bit that turns on and off at exactly the frequency your instructor wants. It is true during the first scan of the program following the transition from stopped to running.
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The first scan bit in GE Fanuc PLCs is %S001, named "FST_SCN".
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The PLC has internal bits that will be useful.
LADDER LOGIC PROGRAM LAMP FLASH PRO
When the Data Point with Line and Line Only features are used, a line is drawn between each data point.Since you mentioned Versa Pro software you must be using a GE Fanuc PLC. Data can be retentive so that it is maintained even if power is removed from the HMI + PLC. Up to 100 historic data points can be displayed. XY Plot (multipoint ? IEC programming mode only): In this mode, data points (historic) previously recorded are not erased when new data points (current) are read. An error message will display along the bottom of the plot when values are read that are outside the specified grid range. Reference lines can be added to the grid to help determine if the data points are within an acceptable range. A single point is displayed on the plot, the position of the point changes as the values in the registers change over time. XY Plot (single point): Plot the value in one register against the value in another register. Data logged to the external SD card can be sent to an external FTP server at a user specified periodic interval.Data logging start and stop times can be controlled by a push-button or a system bit.Data logging can start immediately on power up or the start times can be pre-configured in the Data Logger Start Time/Stop Time fields.Up to 20MB of internal memory or 32GB of external SD card memory can be configured for data logging.Up to four groups can be created, and each group can have a maximum of 30 registers.Gathers and saves important process information for analysis. Theĭata Logging feature is most often used for data acquisition where the HMI + PLC HMI + PLC screen using the Historical Trend or Real Time Trend objects. HMI + PLC's non-volatile memory or attached SD card and can be displayed on the
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LADDER LOGIC PROGRAM LAMP FLASH SERIES
The Data Logger available in the HMC3000 series is used