PSIM
Word Compare Instructions
Introductory Lab

Word Comparison Instructions

• From the Main Menu of the PSIM program, select the I/O simulation display.

• Toggle Function Key [F2] until the minimum I/O Data Table is displayed in the upper box of the display, and the Counter Table is displayed in the lower box of the Data table display.

• Select the Rung Editor [F5] and enter the following ladder Logic program.

• Once you have entered your program, select the Program Utility menu and save your program to disk. Now exit the Rung Editor and return to the I/O simulation Display.

• Open and Close switch I:1/00 a number of times and carefully observe the incrementing of C1's accumalator and the operation of the 3 lights which are controlled by your program.

• Continue incrementing the counter until the "RES" instruction in rung #2 is activated.

• What was the highest count achieved before the "RES" instruction zeroed the accumalator?

• Highest accumalator count: ________

• Increment the counter again through its range and note the accumalator values which allow the lights O:1/00, O:1/01 and O:1/02 to be energized. Note the values on the appropriate rungs listed below.