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Programming the PLC - Twelve Drummers

The editing results are shown graphically on the PC’s screen in a form that electricians call “ladder logic” networks.

Picture 11 shows an example screen of one such network, the one controlling the four outputs (17-20) for the “Santa Drummer, Alligator & Hearts” at the top centre of the 12 Drummers Drumming display.

Steadily the program was built up network by network until all of the 51 different lighting elements in the display were controlled in line with the program sequence chart, and when completed consisted of 20 networks in total.

Again this stage took about a week to complete, to load, test, debug, re-test and finalise things like labelling and updating record documentation of changes made along the way.

 

Picture 11 – Example program network
Picture 11 – Example program network

Contributions by GordonG

TitleUpdatedType
Installing Onsite - Twelve Drummers 8 years 37 weeks agoBook page
Final Fitting - Twelve Drummers 8 years 37 weeks agoBook page
Wiring the Components - Twelve Drummers 8 years 37 weeks agoBook page
First Impressions - Twelve Drummers 8 years 37 weeks agoBook page
Backplate Assembly - Twelve Drummers 8 years 37 weeks agoBook page
Sourcing the Equipment - Twelve Drummers 8 years 37 weeks agoBook page
Unit Design - Twelve Drummers 8 years 37 weeks agoBook page
Design & Equipment - Twelve Drummers 8 years 37 weeks agoBook page
The Call to Arms! - Twelve Drummers 8 years 37 weeks agoBook page
Program Chart - Twelve Drummers 8 years 37 weeks agoBook page
Bringing the Display to Life - Twelve Drummers 8 years 37 weeks agoBook page
Programming the PLC - Twelve Drummers 8 years 37 weeks agoBook page