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(I can post a screenshot of what I had been doing if helpful) (because you can adjust your PLC program logic to work with either switch polarity). Yes, you will be able to control Forward and Reverse with 2 separate physical limit switches. As almost all beginners, you have failed to state WHICH model you have, and until that is known, all question answers can only be vague and based on guesswork.Ģ) Can this be done with 2 limit switches only, 1 NO and 1 NC, or would I need 4?
#Internal relays logix pro manual
See Appendix A-1 in your MicroLogix 1000 User Manual for a list of the Hardware Specifications of each MicroLogix 1000 model.
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However there are about 3 models of the MicroLogix 1000 that have analog I/O: the models that have a "-5A" at the end of the model number. Your MicroLogix1000 has mostly Digitial On/Off Inputs and Outputs. Yes, and the two basic types are Digital (On/Off) and Analog (continuous signal over some Min to Max range). I tried looking at the user manual but was still confused.ġ) Are certain I/O "nodes" designated for certain types of signals? Or am I way off here, and the PLC only outputs much less voltage. 1 set to stop the fwd and another set to simultaneously start the reverse circuitry for the motor? (I can post a screenshot of what I had been doing if helpful)ģ) I noticed that the micrologix has a 24V DC output, I'm assuming I need to find relays that close when 24V is introduced. Can this be done with 2 limit switches only, 1 NO and 1 NC, or would I need 4.
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So the slider on the machine would run forward hit a limit switch, reverse, hit the other limit switch, run fwd. The goal of the lab is for a machine to undergo continuous motion. For instance, are I:0-4 only for digital or does it not matter really where I wire certain things up? For reference, I'm designing this lab around the micrologix 1000, might be overkill but it's all hypothetical.Ģ) I was playing around with the RSLogix demo software, and I couldn't get the "fwd LED" and "rverse LED" to simultaneously turn off and on respectively. Yea I was thinking about that, but since I'm basically designing a lab that future students could do, I figured I'd let them think about this.ġ) Are certain I/O "nodes" designated for certain types of signals. I understand - again not needed here - just a thought Good practice to avoid the posibiity of bringing both contactors on at once. When you swap a motor from forward to reverse it is a good idea to allow a few Milli seconds of delay time. Just to throw a spanner in the works of your program