Forward/reverse conveyor

The brief

Client

Northfield Packing

Site

Transfer conveyor CV-04

Work order

NP-2602

Industry

Packaging

Task code

PLC-02

Difficulty

Foundation

Type of work

Programming

Run a conveyor both ways from two contactors that must never close together, with a dead time before the motor may be reversed.

What you do

1. Read the client brief and the tag table: 5 tags, 3 inputs and 2 outputs.
2. Write the logic in ladder, Structured Text or SFC.
3. Press Simulate and watch the plant answer your program.
4. Run the factory acceptance test and fix what fails.

Skills you practise

• Electrical and software interlocks
• TON timers
• Seal-in circuits
• Reversing starters

What the test checks

The factory acceptance test runs 5 numbered tests against your program. The numbers in the brief are drawn per learner. The tests are:

• Forward runs and keeps running until Stop
• Reverse runs and keeps running until Stop
• The other direction is locked out while running
• Forward to reverse waits for the dead time
• Reverse to forward waits for the dead time

In this lab

• Ladder, Structured Text and SFC in one studio
• A plant that answers: motors, tanks, conveyors
• Numbered tests mark your program