Zone 5 is stopped, PE5 is clear, Zone[5].Expecting is 0, and there is a 600 mm carton standing 30 mm short of the beam that no zone on the line is driving. Zone 4 behind it has a carton on its eye, Owns clear, its hold timer done, and every permissive it needs to release … Read more
The warehouse system’s report for the night shift said 4,629 cartons sorted, 100% to the lane the order wanted, and the lane 2 pallet had 19 cartons on it that belonged in lane 3 and a picker who found them at 06:40. The sorter had no way to know. Its scanner read the label, its … Read more
Zone 6’s eye came out of stores as a 42EF-P2KBB-F4, went onto the bracket in place of a 42EF-P2JBB-F4, and from the next 600 mm carton on, zone 6 reported occupied while it was empty and empty while a carton stood on it. One letter in the fifth position of the catalogue number, K for … Read more
A CTU on the end-of-line eye of a takeaway running 0.500 m/s read 12,480 at the end of a shift in which the palletiser stacked 12,116 cartons, and it had been drifting the same way, 2.6% to 3.4% high, for three weeks. Counting cartons was one contact and a counter, and there was nothing wrong … Read more
Two PowerFlex 525s with 42.50 Hz on both keypads were running the takeaway at 0.500 m/s and the palletiser infeed it hands over to at 0.462 m/s, and every carton that crossed the transfer between them arrived 7.6% closer to the one in front than it had left. A 1219 mm carton that left the … Read more
A 1024 PPR encoder on the tail roller of an 8 m belt, read in X4 by a 5069-HSC2xOB4, gives 652 counts for every 50 mm of belt, and a shift register that moves one cell every 652 counts knows where a carton is to within one cell whether the belt is running at 0.500 … Read more
Write an AHU sequence on a CompactLogix: damper minimum position, supply fan VFD, chilled water PID, economizer changeover, compressor staging and BACnet.
How to pick discrete and analog I/O, get sinking and sourcing right, set RPI and electronic keying, wire a 4-20 mA loop and scale the raw counts.
How a PLC state model feeds OEE, downtime reason codes and SPC triggers on a rotary filler: the ST block, the tag structure and the classic mistakes.
Wellpad controller choice, an ESD permissive rung that will not auto restart, Modbus poll budgets over radio, flow computers and tank farm level control.
Wire a power meter into Logix or S7, totalize kWh in Structured Text, hold the demand peak with priority load shedding, and check if a VFD retrofit pays.
PLC motion control step by step: motion group setup, coarse update period, axis scaling, MSO and MAM moves, homing, gearing and position error faults.