Internet PLC Forum

General => Technical support => Topic started by: perching on August 05, 2009, 06:54:16 AM

Title: Matrix keypad
Post by: perching on August 05, 2009, 06:54:16 AM

I want to connect a matrix keypad 3x4 to a T100MD-888+, how is this done?

Title: Re:Matrix keypad
Post by: support on August 05, 2009, 10:19:27 AM

A matrix keypad consists of rows and columns. You need to connect the rows to the PLC's digital input and columns to the PLC's digital outputs. So if you use a T100MD888+ you need to reserve 4 digital inputs and 3 digital outputs for the keypad alone.

There is a sample program called "MatrixKeypad.pc6" in the "TRiLOGI\TL6\usr\samples" folder that you can follow to understand how the PLC can be programmed to handle a matrix keypad.