The SLC-500 OSR / PLC-5 & Micrologix 1200&1500 ONS is a single bit instruction. However, depending on the processor you select, the unsupported instructions won't be available, and OSR will be interpreted differently. The Micrologix 12 are introduced, and lo and behold, they support the same three one-shot instructions the PLC-5 does, and they are called the same names as the PLC-5! The RSLogix500 software is used to program the SLC-500 _and_ Micrologic processors, so it supports all three instructions. But for some reason that remains a great mystery to me, that _same_instruction_ in the SLC-500 processors was, and still is, called OSR. The then-new SLC-500 processors had only the simplest one shot instruction, equivalent to the PLC-5 ONS. The PLC-5 had three one shot instructions: ONS, OSR, and OSF. The PLC-5 already existed, and the SLC-500 was designed by a different group within A-B. Go back with me in time about 10 years to the beginning of the Allen-Bradley SLC-500 line of processors.
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