Alan Case
Lifetime Supporting Member
Hi all. Mine is a specific AB question. I am trying to move an item at 2 metres a second and stop it with about 3mm accuracy.
I am using an AB micrologix 1200 HSC, a bulletin 160 drive, a squirrel cage motor with brake and an encoder.
I have the system working but I am not sure if there is a better way.
Sequence of events.
Load a high preset into the HSC
Release the brake and on the output for 50 Hz to the drive
In the normal scan when the item is close to the position I on the slow speed command to the drive. 3 hz
When the HSC sees the high preset reached, the HSC program file is run.
In this file the outputs controlling the drive and the brake are unlatched. Then I use an immediate output to set the outputs to what the data table says they should be. I also set the binary bits that control these outputs elsewhere in the program to a state that will not turn them on again.
When the item has performed all the tasks at this position the process is repeated. I am getting the accuracy I require but is this the usual way to attack a job like this.
Regards Alan Case
I am using an AB micrologix 1200 HSC, a bulletin 160 drive, a squirrel cage motor with brake and an encoder.
I have the system working but I am not sure if there is a better way.
Sequence of events.
Load a high preset into the HSC
Release the brake and on the output for 50 Hz to the drive
In the normal scan when the item is close to the position I on the slow speed command to the drive. 3 hz
When the HSC sees the high preset reached, the HSC program file is run.
In this file the outputs controlling the drive and the brake are unlatched. Then I use an immediate output to set the outputs to what the data table says they should be. I also set the binary bits that control these outputs elsewhere in the program to a state that will not turn them on again.
When the item has performed all the tasks at this position the process is repeated. I am getting the accuracy I require but is this the usual way to attack a job like this.
Regards Alan Case