=+

(c) Estimate the mean utilization of the robot. Is it playing a satisfactory role in the system?

Hint: The program should have a similar structure as that of MC2.MDL. There is, however, an additional requirement to test the availability of the robot each time a part is to be loaded or unloaded. This can be easily accomplished by using the following instructions:

TP (Test Positiont): Test the screen location(s) specified for occupancy. Continue execution with the next instruction only if the location is clear.

PO (POst position): Post the specified location(s) as occupied.

CL (CLear position): Clear posted location(s).

Once a free machine is found, the program could try to grab the robot by, for example, calling a link such as:

BL(!LOAD)

TP(*ROBOT)

PO(*ROBOT)

WT(%LOADING)

CL(*ROBOT)