How can I select entity to specific output port in simevents?

I'm trying to simulate a production system, idea is that, the customer order one product with type 1 or 2 or 3, which is random generated by using attribute. In production area, there are machine A1 B1 C1 A2 B2 C2, A for operation OP1, B for OP2, and C for OP 3, product type 1 need OP1 and OP2, product type 2 needs OP2 and OP3, type 3 needs OP3 and OP1. all operation with arbitrary sequence. what I wanna do is, let the control system using stateflow to decide which machine should take the Order, if the machine is not busy. if the operation steps are finished, the order will be taken to terminator.

Answer 1

[Ravi]

Hi Xinrui Qian,

I will provide you a pseudo code about how the chart should be designed, since the interpretation of variables is unclear from the screenshot you have attached. Also, what parameters determine if the machine is busy or available is unclear. You can create the stateflow chart as follows.

Pseudocode:

state Idle
    on: new_order % IN variable has some value in it.
    if product_type == 1 then
        transition to State_OP1_for_Type1
    elseif product_type == 2 then
        transition to State_OP2_for_Type2
    else
        transition to State_OP3_for_Type3
    end
    
%---------------------%

state State_OP1_for_Type1
    on: entry
    if A1_not_busy then
        assign A1  
        transition to State_OP2_for_Type1
    elseif A2_not_busy then  
        assign A2  
        transition to State_OP2_for_Type1  
    else  
        stay in State_OP1_for_Type1
    end
    
%---------------------%

state State_OP2_for_Type1  
    on: entry  
    if B1_not_busy then  
        assign B1  
        transition to Order_Completed  
    elseif B2_not_busy then  
        assign B2  
        transition to Order_Completed  
    else  
        stay in State_OP2_for_Type1  
    end

%---------------------%
    
state Order_Completed  
    on: entry  
    send_order_to_terminator  
    transition to Idle

In the above pseudocode, you can add similar states for type 2 and type 3, “State_OP2_for_Type2”, “State_OP3_for_Type3” for type 2 and “State_OP1_for_Type3” and “State_OP3_for_Type1” for type 3.

Let us assume a new order with type 1 has arrived into the system. The Idle state, identifies a new order and passes it to the “State_OP1_for_Type1” state. Here, if “A1” is available, then after processing, it is sent to “State_OP2_for_Type1”. If “A1” is busy, then “A2” is checked. If we find that both “A1”, and “A2” are busy, then call the same state again until any of the machine is free. Once, it passes both the operations, transition it to the “Order_Completed” state.

I hope this provides a way to solve the issue you are facing.