Hi all,
I'm fairly new to the PLC world and am currently working on designing a portion of a ladder logic diagram for a group project. I was hoping someone here could help me find some footing and gain some direction on the project?
Here are further details:
There are 3 sections in “Texas Automated Grocery” store namely Fresh produce section, Meat section and Frozen/ready to go section. A customer entering the store goes to Fresh produce section first and is given 30 minutes to choose a selection and put in their assigned grocery carton. After the 8 minutes at the Fresh produce section they are moved to the Meat section. They can spend 8 minutes in the Meat section and choose whatever they want to be put in their grocery carton. After 8 minutes in Meat section they move to the Frozen/ ready-to-go section. Like the previous time limit, customers can spend 8 minutes here and choose whatever they want. If at any time the grocery carton is loaded with more than 30 items, customers are instructed to choose another grocery carton. The assigned time in each section is limited to 8 minutes to avoid traffic. The store still uses the RSLogics 5000 software for the controlling PLC.
Note: Time in each section is reduced to 2 min and total items in bag to 20 for implementing the scenario.
Steps to do:
1> Entering the grocery store is indicated by IN_1 which starts the 2 min timer, T1. IN_2 is used to count the total number of items being put in the grocery carton from fresh produce section.
2> After the 2 min timer T1 ends another timer T2 starts which runs for a total of 2min. During this time period grocery items added to the carton are incremented using IN_2. Fresh produce section Meat Section Frozen/ Ready to go section Carton Carrier ESET400 Lab Project Assignment Spring 2020 2
3> After the 2 min timer T2 ends another timer T3 starts which runs for a total of 2min. During this time period grocery items added to the carton are incremented using IN_2 for Produce, IN_3 for Meat, and IN_4 for Frozen food.
4> Anytime during the process if the total number of items in the grocery carton becomes more than 20, an indicator LED indicating overload and requests one additional carton to be added to the carrier.
5> Consider a math function to be used to determine the total items that are loaded in the carton and provide OUT_1 to indicate a full carton and request the additional carton. Consider using intermediate outputs A, B, C, D to facilitate a move command from one station to the next and to initiate the addition of the extra carton. (Output A) provides a move command to move the cart from the produce section to the meat section. Output B provides a move command to move the cart from the meat section. Output C provides a move command to move the cart from the meat section to the frozen food section. Finally, Output D provides a command that the carton is full and another carton must be provided to the cart.)
6> OUT_3 turns on the loading robot which has a cycle time of 30-seconds (T4). Once the robot cycle time is completed OUT_4 provides a light to signal the car to leave the store.
7> At the end of the cycle all the timers and counters should be reset indicating the end of process. (Do not use another input to reset the timers and counters)
Thanks in advance to anyone who is able to help me out! If there's anything I can clarify, please let me know.
I'm fairly new to the PLC world and am currently working on designing a portion of a ladder logic diagram for a group project. I was hoping someone here could help me find some footing and gain some direction on the project?
Here are further details:
There are 3 sections in “Texas Automated Grocery” store namely Fresh produce section, Meat section and Frozen/ready to go section. A customer entering the store goes to Fresh produce section first and is given 30 minutes to choose a selection and put in their assigned grocery carton. After the 8 minutes at the Fresh produce section they are moved to the Meat section. They can spend 8 minutes in the Meat section and choose whatever they want to be put in their grocery carton. After 8 minutes in Meat section they move to the Frozen/ ready-to-go section. Like the previous time limit, customers can spend 8 minutes here and choose whatever they want. If at any time the grocery carton is loaded with more than 30 items, customers are instructed to choose another grocery carton. The assigned time in each section is limited to 8 minutes to avoid traffic. The store still uses the RSLogics 5000 software for the controlling PLC.
Note: Time in each section is reduced to 2 min and total items in bag to 20 for implementing the scenario.
Steps to do:
1> Entering the grocery store is indicated by IN_1 which starts the 2 min timer, T1. IN_2 is used to count the total number of items being put in the grocery carton from fresh produce section.
2> After the 2 min timer T1 ends another timer T2 starts which runs for a total of 2min. During this time period grocery items added to the carton are incremented using IN_2. Fresh produce section Meat Section Frozen/ Ready to go section Carton Carrier ESET400 Lab Project Assignment Spring 2020 2
3> After the 2 min timer T2 ends another timer T3 starts which runs for a total of 2min. During this time period grocery items added to the carton are incremented using IN_2 for Produce, IN_3 for Meat, and IN_4 for Frozen food.
4> Anytime during the process if the total number of items in the grocery carton becomes more than 20, an indicator LED indicating overload and requests one additional carton to be added to the carrier.
5> Consider a math function to be used to determine the total items that are loaded in the carton and provide OUT_1 to indicate a full carton and request the additional carton. Consider using intermediate outputs A, B, C, D to facilitate a move command from one station to the next and to initiate the addition of the extra carton. (Output A) provides a move command to move the cart from the produce section to the meat section. Output B provides a move command to move the cart from the meat section. Output C provides a move command to move the cart from the meat section to the frozen food section. Finally, Output D provides a command that the carton is full and another carton must be provided to the cart.)
6> OUT_3 turns on the loading robot which has a cycle time of 30-seconds (T4). Once the robot cycle time is completed OUT_4 provides a light to signal the car to leave the store.
7> At the end of the cycle all the timers and counters should be reset indicating the end of process. (Do not use another input to reset the timers and counters)
Thanks in advance to anyone who is able to help me out! If there's anything I can clarify, please let me know.