If you don't use the "Output Bit" outside of the OSR instruction, then it is effectively doing nothing. So one OSR instruction can simultaneously "rung-condition-out" on its own rung, and control other rungs using its "Output Bit". However, the advantage of now having an "Output Bit" for an OSR instruction, is that anywhere apart from the OSR's rung that you also want the OSR to control, you can use the "Output Bit". In that case, you just have to assign a tag to the "Output Bit" for the program to verify. So, you do not have to use the "Output Bit" anywhere else in the program if all you want the OSR instruction to do is enable the rest of the rung it resides on. If you do not use the "Output Bit", outside of the OSR instruction, the "rung-condition-out" will still enable the "rung-condition-in" for the next instruction on the rung, if there are any.
The "rung-condition-out" from the OSR is then set to true. This bit, or tag, is set true when the OSR is executed, and the "Storage Bit" is false. What you now have to do is assign another unique tag for the "Output Bit". These instructions are output instruction, and so can reside at the end of the rung. On the output side, these OSR instructions provide both a "rung-condition-out", and an "Output Bit". Any unique tag you create to store the current "rung-condition-in" for the OSR instruction can be assigned as the "Storage Bit". The "Storage Bit" is similar to the older OSR "Storage Bit". These OSR instructions are not output instructions, they are input instructions, and so must be placed before output instructions on a rung.Īs Bernie pointed out, how the OSR instruction operates for the Logix controllers, and the MicroLogix 1200/1400/1500 controllers, is somewhat different.įor these newer OSR instructions, both the "Storage Bit" and an "Output Bit" are included in the OSR instruction. You appear to be converting from an SLC 500 or MicroLogix 1000/1100 controller, which only uses a single "Storage Bit" for OSR instructions.įor these older OSR instructions, the "Output Bit" does not exist, and the only "Output" it provides is its "rung-condition-out" to the next instruction on the rung. so where i find an OSR in the micrologix.
0 kommentar(er)
