PLC systems are inherently expensive, and down-time is often very costly. Download the ladder logic program to the TLP LogixPro Simulator and test the traffic light control.In order to properly understand the operation of a PLC as complex and powerful as the RSLogix 5000, it is necessary to spend considerable time programming, testing, and de-bugging ladder logic programs. If the one-second delay is insufficient to control the traffic, you can increase the timer preset value to 200 (2 seconds) in step 4.ħ. OTL O:2/04 (Red (delayed) light output)Ħ.
OTL O:2/05 (Amber (delayed) light output) OTL O:2/06 (Green (delayed) light output) XIC Timer 0:2/01.ACC > 0 (Timer accumulated value greater than 0) XIC Timer 0:2/01.ACC > 100 (Timer accumulated value greater than 100) XIC Timer 0:2/01.ACC > 300 (Timer accumulated value greater than 300) XIC Timer 0:2/01.ACC > 400 (Timer accumulated value greater than 400) XIC Timer 0:2/01.ACC > 800 (Timer accumulated value greater than 800) Network 1: Timer and Word Comparison Instructions
Let's use a timer preset value of 100 (1 second) and a timer timing bit address of T4:0/DN (done bit of Timer 0:2/01). To implement the timing, we will use the timer in conjunction with word comparison instructions. We need to implement the following sequence:
The sequence of operation and timing durations are given in the timing diagram. Let's assign a timer address to Timer 0:2/01.ģ. We will use a single timer to control the timing of the traffic light sequence.
We will use the given addresses for the traffic light outputs: Red = O:2/00, Green = O:2/02, Amber = O:2/01, and Green (delayed) = O:2/06, Amber (delayed) = O:2/05, Red (delayed) = O:2/04.Ģ. First, we need to create a ladder logic program in TLP LogixPro Simulator to control the traffic light.
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