ACC Control Panel Scene

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BRIDGE WS URL: Run acc-modbus-bridge.js first, then click CONNECT

OUTPUTS Y

Motor RunPanel Pilot Light

I/O Map

Y1 → Motor Run LED

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INPUTS X

Start PBN.O. Momentary

Stop PBN.C. Momentary

N.C.

Jog PBN.O. Momentary

Sequence Log

Open ACC PLC Simulator to link — or press RUN for standalone mode SCAN #0

CONTROL PANEL SCENE

Start / Stop / Jog Motor Control

A floor-mounted NEMA 4 steel enclosure with three 30mm operator pushbuttons and a pilot light. This is the fundamental building block of every industrial control panel — the Start/Stop/Jog circuit is usually the first program a PLC technician writes on a real machine.

I/O MAP

Address	Dir	Description
X1	IN	Start pushbutton — N.O. momentary
X2	IN	Stop pushbutton — N.C. momentary
X3	IN	Jog pushbutton — N.O. momentary
Y1	OUT	Motor run pilot light / contactor

FIVE STEPS TO PLC PROGRAM DEVELOPMENT

Use these five steps to develop your ladder program for this scene. Run standalone mode first to observe correct behaviour, then build and test your program in the ACC PLC Simulator.

STEP 1

Define the Task

A motor must be controlled from a panel with three pushbuttons. Pressing Start runs the motor. Pressing Stop turns it off. Pressing and holding Jog runs the motor only while held — releasing stops it immediately. Stop must always override Start and Jog. The motor must not restart after a power failure.

STEP 2

Define the Inputs and Outputs

X1=Start (N.O.), X2=Stop (N.C. — normally ON, goes OFF when pressed), X3=Jog (N.O. — ON only while held), Y1=Motor output. Note: Stop is wired N.C. for safety — a broken wire opens the stop circuit.

STEP 3

Develop the Sequence of Operation

Motor starts when Start is pressed AND Stop is not pressed. Once running, the motor must continue after Start is released — this requires a seal-in contact (Y1 parallel with X1). Stop unlatches the seal-in. Jog runs without latching — a Jog condition must block the seal-in from engaging. Consider: what happens if Start and Jog are pressed at the same time?

STEP 4

Develop the PLC Program

Write your ladder in the ACC PLC Simulator. You will need at least two rungs: one for the Start/Stop seal-in, and one to handle Jog without latching. Think carefully about the interlock between Jog and the seal-in contact.

STEP 5

Test the Program

Connect this scene, press RUN, and verify: (1) Start latches motor ON; (2) Stop turns it off; (3) Jog runs only while held and does not latch; (4) Stop always wins over Start and Jog. Use STEP mode to trace individual scans.

What is the ACC Modbus Bridge?

Step 1 — Download the installer

Step 2 — Install Node.js (one-time)

Step 3 — Run the installer

Step 4 — Start the bridge

Step 5 — Connect this scene

Modbus Address Map — Control Panel Scene