Logix Designer, RSLogix 500/5000, RSLinx, FactoryTalk and the faults you meet on a ControlLogix or CompactLogix line.
Scaling a Kinetix Axis in Real Units: Position Units, the Conversion Constant and the Gearbox A new Kinetix axis is scaled one Position Unit per motor rev, at 1,000,000 Motion Counts per rev, and on Unlimited travel that axis rolls its position accumulator over after 2,147 revolutions. The motion runs through the rollover perfectly smoothly. … Read more
Tuning a Kinetix 5700 Axis: Load Ratio, Bandwidth and the Autotune That Lies Loop Response on the General page of a Kinetix axis is a three-item dropdown, and on a drive with the default 1.5 ms model time constant it moves the position loop between 8.2 Hz and 101.7 Hz. That is a factor of … Read more
Driving a Motor from a ControlLogix: From a Rung to a Turning Shaft on a Kinetix 5700 A 2198-D032-ERS3 inverter, a VPL-B1303C motor on one Hiperface DSL cable, and a 1756-L83E that has never carried a motion group. Two rungs will turn that shaft — an MSO and then an MAM — and neither is … Read more
MCD and MCCP: Changing the Speed of a Move in Flight, and What MCCP Actually Calculates An MCD that lowers Decel from 1000 mm/s² to 200 mm/s² 1.72 seconds into an absolute move catches the axis at 391.6 mm with 131 mm/s still to lose. Stopping at the new rate takes 42.8 mm and only … Read more
MAG and Gearing Two Axes: The Ratio, the Slave, and What Happens on a Fault A MAG with a Ratio of 0.5 and Clutch enabled, fired at a slave whose master is already running at 600 mm/s, ramps the slave to 300 mm/s in 0.30 seconds at 1000 mm/s² and leaves it permanently 44.9 mm … Read more
MAH and Homing a Kinetix Axis: The Switch, the Marker, and the Home That Lands in the Wrong Place A home-to-switch-then-marker sequence at a Home Speed of 25 mm/s and a Home Return Speed of 5 mm/s takes just over four seconds on a 2198-D032-ERS4 axis, and 1.5 of those seconds are spent crawling back … Read more
MAM Against MAJ on a Logix Axis: A Move That Ends and a Move That Does Not An absolute MAM to 400.000 mm at 250 mm/s, with 1000 mm/s² either side of the cruise, sets its .PC bit 1.83 seconds after the rung goes true. An MAJ at 120 mm/s on the same axis sets … Read more
MSO, MSF and MASD on a Logix Axis: Enabling It, Dropping It, and the One That Opens the OK Contact An MSO against a 2198-D032-ERS4 axis sets ServoActionStatus and DriveEnableStatus, and it does not set its own .DN bit in the scan that fired it. On a 2 ms coarse update period the drive answers … Read more
The Motion Group and the Coarse Update Period: What Happens When You Ask for Too Much Bit 2 of MOTION_GROUP.GroupFault is GroupTaskLoadingFault, and the motion instruction reference describes it in plain words: the group coarse update period is too low, and user application tasks are not getting enough time to execute. That is a 1756-L84E … Read more
Kinetix 5700 DC Bus Sharing: What the Bus Supply Carries and Where the Limit Is A 2198-P208 supports 13,000 µF of total system capacitance and puts out 46 kW continuously. Those are two separate ceilings, they get reached by two different kinds of machine, and on most rails the one that stops you first is … Read more
Removing an Axis From a Running Kinetix 5700 System Without Faulting the Rest A 2198-D032-ERS4 is two axes behind one Ethernet connection on one set of bus bars, and inhibiting either half takes the other half with it. Getting the module off the rail is a different order of problem: control power and mains off, … Read more
Adding an Axis to a Kinetix 5700 System: the Module, the Axis, and the Four Places to Set It The eighth axis on the line is a 2198-D032-ERS4 in the last 55 mm of the rail, and getting it into the project is four dialogs and about twenty minutes. What takes the rest of the … Read more