Hi Everyone,
I've ran into a problem with a project I'm working on for college so hoping to get some advice here as my knowledge and experience is limited. The system includes a motor and incremental encoder feeding back to a control logix 1756 input card. The encoder is a sick DSK40 and it has up to 2048 lines per rev. The motor has a reduction gear fitted to the working end of it meaning I get 1 revolution for every 32 of the motor. The problem is the input card cannot pick up on the pulses from the encoder, I've read here that I will need a high speed input card for this to function correctly. My problem is I don't have the time or the money to get the high speed card. So, my question is, would a less accurate encoder, one of say 10 or 15 pulses per revolution suffice? Would a encoder with 10 pulses give longer pulses or just less of them? If they were longer pulses then do you think the input card could pick up on them? I'm not to too worried about losing the accuracy because of the 32:1 reduction gear I will still be accurate on the head. So if I had an encoder with 10 pulses per rev this would still give me 320 pulses per revolution of my tooling head.
If possible I would prefer to use the incremental encoder due to cost etc but alternatively, would an absolute encoder need a high speed card or would this be usable with my input card?
Apologies for long winded question, any help or advice would be hugely appreciated.
Thanks,
BP
I've ran into a problem with a project I'm working on for college so hoping to get some advice here as my knowledge and experience is limited. The system includes a motor and incremental encoder feeding back to a control logix 1756 input card. The encoder is a sick DSK40 and it has up to 2048 lines per rev. The motor has a reduction gear fitted to the working end of it meaning I get 1 revolution for every 32 of the motor. The problem is the input card cannot pick up on the pulses from the encoder, I've read here that I will need a high speed input card for this to function correctly. My problem is I don't have the time or the money to get the high speed card. So, my question is, would a less accurate encoder, one of say 10 or 15 pulses per revolution suffice? Would a encoder with 10 pulses give longer pulses or just less of them? If they were longer pulses then do you think the input card could pick up on them? I'm not to too worried about losing the accuracy because of the 32:1 reduction gear I will still be accurate on the head. So if I had an encoder with 10 pulses per rev this would still give me 320 pulses per revolution of my tooling head.
If possible I would prefer to use the incremental encoder due to cost etc but alternatively, would an absolute encoder need a high speed card or would this be usable with my input card?
Apologies for long winded question, any help or advice would be hugely appreciated.
Thanks,
BP