CeCo3
Member
Okie,
Thanks, the real magic is having an eight channel analyzer. The continuous recording capability gives you a real opportunity to study machine behaviors over time, even if it means millisecond by millisecond.
The SLC5/04 is lightly loaded, meaning there isn't a whole lot going on except measuring two inputs, calculating statistics, populating a data table and messaging the table to the main controller once per revolution. Yeah, I'm pleased it holds the 4msec pretty well, all things considered.
The encoder is an AMCI unit with an external relay board providing the timed interrupts. That makes it very accurate because the SLC does not generate its own timing strobes (we don't have an HSCE card). Darned if the manufacturer didn't route the precise timing strobe back through the SLC though, meaning the process is still somewhat scan dependent.
Yessir, ControlLogix would be the way to go.
Heck, we had a kickers that had AC solenoids driven by zero-crossing SSRs, so we would lose up to 8msec waiting for the solenoid to activate. These things also had short a duration cycle, and they couldn't figger out why the kickers were short stroking. Hmmm, we were only seeing three alternations of AC for the entire kicking cycle. Arrgh. I replaced dem solenoid-driven cylinders with double acting cylinder controlled by DC solenoid valves. Huge improvement.
Lots more stories with low hanging fruit.
Nice chatting with you.
CeCo3
Thanks, the real magic is having an eight channel analyzer. The continuous recording capability gives you a real opportunity to study machine behaviors over time, even if it means millisecond by millisecond.
The SLC5/04 is lightly loaded, meaning there isn't a whole lot going on except measuring two inputs, calculating statistics, populating a data table and messaging the table to the main controller once per revolution. Yeah, I'm pleased it holds the 4msec pretty well, all things considered.
The encoder is an AMCI unit with an external relay board providing the timed interrupts. That makes it very accurate because the SLC does not generate its own timing strobes (we don't have an HSCE card). Darned if the manufacturer didn't route the precise timing strobe back through the SLC though, meaning the process is still somewhat scan dependent.
Yessir, ControlLogix would be the way to go.
Heck, we had a kickers that had AC solenoids driven by zero-crossing SSRs, so we would lose up to 8msec waiting for the solenoid to activate. These things also had short a duration cycle, and they couldn't figger out why the kickers were short stroking. Hmmm, we were only seeing three alternations of AC for the entire kicking cycle. Arrgh. I replaced dem solenoid-driven cylinders with double acting cylinder controlled by DC solenoid valves. Huge improvement.
Lots more stories with low hanging fruit.
Nice chatting with you.
CeCo3