Free
Simulate Routine
Runs the routine you have open, scanning top to bottom continuously, the same way a PLC does.
Simulation
Put the Whole Controller in Run Mode — in a Browser Tab
Simulate one routine on Free, a whole program on Pro, or the entire controller on its real task schedule on Max. No controller needed.
Three scopes
Routine. Program. Whole controller.
Each scope scans the way a Logix controller does.
Pro
Simulate Program
Every scan starts at the Main routine, and every energized JSR runs its routine right there, mid-scan — all sharing one set of tags.
Max
Simulate Project
Every task runs its scheduled programs: the continuous task every cycle, each periodic task on its own clock, event tasks when triggered. The closest thing to putting the project in Run mode.
The test bench
Drive it like you're standing at the panel.
Inputs and outputs
Bit inputs as switches, numeric inputs as fields, and an indicator lamp for every output. Click a lamp to jump to the rung that drives it.
Play, Step, Reset, Speed
Run continuously, step one scan at a time, slow it down, or reset every tag to its saved value.
Forces and pushbuttons
Toggle or force bits and numerics right on the rungs, with a Forces panel to see and clear them. Make an input a momentary N.O. or N.C. pushbutton.
Power flow you can read
Contacts, wires, branches and coils light up the way Studio shows them online, and timers and counters accumulate live.
Pre-Flight
Catch it before site.
The Pre-Flight Summary flags logic that passes Studio's checks but won't behave:
- Duplicate output coils — the same tag driven by an OTE on more than one rung, where the last rung wins every scan.
- Instruction order — a rung whose saved logic runs an output before the conditions drawn to its left, so it would execute differently than it looks.
Loops and alarms
PID loops that actually close.
PID runs live
With its own tuning, control action, limits and manual mode. Tune it in the PID Setup dialog while it runs.
Field Devices
Switch on a simulated pump and the loop controls a real-feeling process. Turn up the Disturbance knob and watch it recover.
Alarms
ALMD and ALMA detect their conditions and levels, including minimum durations.
Max · preview
Record and trend
Record tags and watch them in Record Weaver's live trend, with measured loop figures for each setpoint step.
With AI
The simulator checks the AI, too.
Pro · AI
Ask while it runs
Questions carry the simulation's live values, so you can ask why a rung isn't energizing right now.
Pro · AI
Every AI edit is test-driven
Before you see a proposed change, it has been run in the simulator and graded against Behavior checks — plain statements of what it should do.
Max · AI · preview
Ask about a recording
Attach a recording to the chat and ask what happened: which interlock dropped out first, why the pump tripped, or which tuning worked better. Answers quote the measured response — settling time, overshoot, offset.
Coverage
What runs, and what doesn't.
Contacts and coils, one-shots, timers, counters, compares, math and CPT, move and logical instructions, program control (JSR, JMP/LBL, MCR, TND), PID, ALMD and ALMA, and Add-On Instructions — with their internals visible.
Rungs with an instruction the engine doesn't simulate yet are greyed out and labelled "Out of scope" — never guessed.
Run Simulate Routine free on your own logic.
Import a routine on the Free plan and put it through its paces today.