trend - PLC Programming & Automation

Sortation Verification: Proving the Carton Went Where the Logic Sent It

plc programming sortation verification confirm eye mis sort counter 1 plc

Sortation verification with a confirm eye past each divert: open a window per commanded divert, then count confirmed, missed and stray per lane.

Accel and Decel Times on a Conveyor PowerFlex 525: The Parameters That Stop F005 on Stop

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plc programming powerflex 525 decel time f005 overvoltage on stop 1 plc

A loaded conveyor trips F005 on every stop: what PowerFlex 525 decel time, A550, P045 and the DB resistor each do to the DC bus, with b005 trended.

PowerFlex 525 F013 Ground Fault: Finding It Without Guessing

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Insulation resistance of the washdown pump measured twice on the same leads: 0.4 megohm at 06:00 cold and damp before the first start, 60 megohm at 08:00 after two hours of running, against the 5 megohm IEEE 43 floor, with a panel listing what each combination of readings points at

F013 is current leaving the motor circuit for earth. A megger routine that separates motor, cable and junction box, with the readings that decide it.

Counting Runtime Hours and Trending Vibration in the PLC

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Timing chart of condition monitoring sampling: the machine starts, a warm-up delay blocks sampling, one-second sample pulses run only while warmed up, and the level 1 alert sets after the average crosses the limit

Build PLC predictive maintenance on hardware you own: vibration and motor current inputs, runtime hours, moving averages, baselines and alarm levels.

HVAC Point Names, BACnet Objects and Overrides That Expire

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Ladder rung for stage 2 cooling: cooling demand in series with stage 1 running, the interstage delay timer done bit, and a normally closed contact on the minimum off timer, driving the stage 2 command

PLC building automation that a stranger can maintain: naming, sequences of operation in the code, staging, BACnet mapping, trends, alarms and overrides.

Remote PLC Monitoring and Control Without Open Ports

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Ladder rung for a remote write permissive: XIC on Remote_Session in series with XIO on the Local_Only key switch and XIO on WDog_Fault, driving the Remote_Write_OK coil

Remote access to a PLC that security will sign off: outbound VPN routers, read-only web HMI, an access rights table, a permissive rung and an audit trail.