Applied Logic (Level 2)

This section warms you up for level two by introducing a few new instructions, offering bonus theory, and highlighting the updated Rs links version needed for project nine.

Learn how the retentive timer preserves accumulated time and supports reset, illustrating with a sample program, a time base of one second, and a comparison to a normal timer.

Explore negate and absolute value in a simple test program, storing results from register 7:0 to 7:1 starting with 25, and observe magnitude and sign changes.

Explain how return and temporary end govern ladder logic execution, using GSR and subroutines to move values through 7:0, 7:1, and 7:2 with one-shot triggers.

Explore bitwise instructions and, or, not, and clear at the word and bit level with hands-on testing on two data words.

Master string search and string extract by locating a dash in a sample string, computing the index, and extracting a three-character substring like PLCC using ASC and AEX.

Explore string handling by converting strings to integers and back in the HCI AIC program. Test A and B verify 747 and 130 conversions and that the final strings match.

Learn to work with ASCII strings by performing an ASCII string compare and a string concatenate, testing equality between strings and building a combined string, preparing for upcoming projects.

Engage in a hands-on level 2 course that trains you to be a capable PLC programmer through ten real-world projects, emphasizing struggle, independent problem solving, and testing against clear criteria.

Solve assignment one by building a PLC program that maintains pressure between 90 and 110 psi, turning the pump on below 90 and off at 110, with run indicator lamp.

Watch a real-world, error-tolerant programming session that shows mistakes while building a four io project with two inputs and two outputs, including IO setup, bits, GSR, and basic control logic.

Explore building pump and indicator control with two rungs, one-shots, and timers, using start and stop delays tied to pressure thresholds such as below 90 psi and 110 psi.

Build semi complex ladder logic to control an indicator bit using start and stop triggers, timers, and open/closed pressure switches, then test in emulate.

Test the first project in the emulator by verifying pump and light behavior across low and high pressure switch states, including five-second delays and energize/de-energize sequences.

Drive motorized conveyor to feed boxes into a filling station, using proximity and color-detection sensors to choose pecans or walnuts from hoppers, with a sonar level sensor stopping the fill.

Develop a RS logic 500 program mapping inputs from proximity switch, level sensor, read photo, blue photo to outputs conveyor, walnut hopper, pecan hopper, using always, interrupts, and one-shot timing.

Learn to implement a three-stage cycle for box handling using an integer counter, tracking bring, fill, and unload, with proximity switch, photo eyes, level switch, and one-shot actions.

Design and tune a conveyor motor and walnut and pecan hopper control using a cycle with mode checks, one-shot triggers, blue photo matching, and level switch interrupts to operate devices.

Test and debug a PLC based conveyor system in an emulator, fix a one shot issue, and introduce an intermediate mode to stop the conveyor when the proximity switch closes.

Test and debug an automated conveyor system by running emulations, saving, reloading, and iterating mode logic to ensure hoppers and conveyors respond correctly to proximity, photo eyes, and level sensors.

Detect when a new value arrives at esti 9:0, parse the string into part number, quantity, and direction, and update inventory counters for parts 1-3, 4-6, and 7-9.

Learn to handle barcode scans and string-based data in an APRC programming context by managing stock quantities and extracting part numbers, quantities, and directions via ASCII string comparisons.

Implement inventory logic for a scan-based system. Use string comparisons to map widget, doodad, and walkie part numbers and adjust quantities from incoming and outgoing values converted to ascii strings.

Practice debugging and iterative testing by running the emulator, diagnosing and fixing a string index bug, and validating that values update correctly across test cases.

Control an automatic multi-position valve with a servo-driven cam and microswitches to detect home, fill, drain, and flush, driven by a host cycle with timing and a home reset.

Learn to build a one-servo control program using bit addressing and io mapping, defining inputs and outputs, a position register 7 0, and microswitch-driven home, fill, drain, and travel states.

Define home, drain, and flush positions and travel state, using XIC conditions to drive destination logic, then implement cycle running, triggers, interrupts, and resets for controlled cycling.

Develop a servo control logic using trigger bits, cycle timers, and position checks to automate fill, drain, and flush sequences, with home and interrupt-driven cycle management.

Perform an ops check to validate servo energization, IO handling, and microswitch state transitions, confirming position values and a pass on all test criteria.

Measure oil flow in a pipe using a rotor meter, count pulses to compute gallons per minute, and validate against Attash PTF test criteria.

Develop a simple k-factor flow meter using timers and counters to pulse a flow sensor every 12 seconds, then convert pulses into gallons per minute.

Perform an ops check by testing a control system in an emulator, adjust F-8 registers to set the K factor and GBM flow, and verify pulse timing yields target counts.

Store runtime in four registers, with seconds in 7:0, minutes in 7:1, and hours across 7:2 and 7:3, enabling up to a million hours and a reset option.

Builds an hour meter by accumulating time with a retentive timer at a millisecond base, converting cycles into seconds, minutes, and hours, with reset and run signals.

Perform an ops check by running the program, verifying zeroed accumulators, enabling input to watch seconds, minutes, and hours counters increment, hold, reset to zero, and resume accurately.