5. Answer the questions about the following timer instructions. a.) Fill in appr

Question

5. Answer the questions about the following timer instructions. a.) Fill in appropriate values for each of the blanks below to setup a timer with a timing interval of 35 seconds. TIMER ON DELAY Timer Time base Preset Accumulated EN DN b.) Fill in appropriate values for each of the blanks below to setup a timer with a timing interval of 12 seconds. TON TIMER ON DELAY Timer EN Preset Accumulated DN c.) Which of the timers above (part'a' or part 'b') would likely be found in a ControlLogix program?

Explanation / Answer

a) TON instruction is used to turn an output on or off after the timer has been on for a preset time interval. following are the perameters to be programed in TON.

Timer: It is used to address a timer counter. it has following format. T4:x. Here T stands for a timer file, 4 is default file number and x is timer no (0 to 255).

Time base : is the time interval used for increment of accumulation. ACC will increase by 1 after delay of time base. this is preset between two values, 1.0 second or 0.01 second for counting.

Preset : Accumulated will count upto this value.

Accumulated : is initial value if ACC.

following are the valid parameters for TON to generate delay of 35sec.

Timer --> T4:2

TIme Base --> 1

Preset --> 35 (35x1sec is delay time)

Accumulated --> 0 (start counting from 0)

or following values can also be used.

Tmer --> T4:1

Time base --> 0.01

Preset --> 3500 (3500x0.01 is delay time)

Accumulated --> 0

b) An alternate data type to for TOn instruction. it used in ControlLogix. following is the description of its parameters.

Timer : To use TON instruction we need to create a tag for that timer. Use of same tag on multile timers cause interface. this tag will have a perset, accumulated value, EN (Enable) bit, DN (Done) bit, and a TT (Timer Timing) bit. e.g.-"exampleTimer".

Preset : Accumulated will count upto this value. This valued shows time interval in milliseconds(ms).

Accumulated: this value increment from initial value to preset value.

parameter to generate delay of 12sec (12000ms) are:

Timer : exampleTimer

Preset : 12000 (12 sec)

Accumulated : 0

c) Timer in part b is used in ControlLogix.

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