Industrial Control Systems (ICS)
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The main PLC is the Micro850 (the one with the sticker), however, we plan to interoperate the Micrologix1100 as a producer of a tag or two in a process we have yet to think of...
No wiring diagram was created but the Black and Green buttons are NO and the Red button is NC.
The processing logic on this PLC has changed many many times, but at the time of this photo, a simple four-rung ladder program was created to latch the light upon the push of the respective color button and unlatch by pushing the black.
As you can see we make use of Rockwell latching/unlatching (or set/reset in CCW) blocks. Since the red button is NC we need to XIO and the other two buttons are NO to we XIC. This can be done in 3 rungs if you are not a lazy copy and paster like us.
For this project, we mainly only want to simulate an over-current condition on the "grid" and then make sure the data from many cycles before and after the trip are recorded and streamed to Splunk.
We will get that as soon as we can get a working serial to USB cable lol.
To generate the currents necessary to simulate fault conditions on an overcurrent relay like the SEL-501 we used a step-down transformer with a ratio of 120 Volts: 12 Volts to take wall-socket AC voltage and decrease it to a safer level while at the same time boosting current (since a 10:1 voltage step-down ratio also yields a 10:1 step-up current ratio). We made sure to choose a transformer with its low-voltage ("secondary") winding rated for the amount of current I intended to pass through the SEL relay's inputs. REF:
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