1.2 COMPUTER COMMUNICATION TO SUPPORT FMS

 

1.2.1 Basic Computer control functions

 

• NC part program storage

 

• Distribution of the part programs to the individual machine tools

- include post processing for specific machine formats

 

• Production control

 

- decisions of part mix, rates, inputs to parts of system

- considers data like,

- desired production rate for parts per day

- number of raw workparts available

- number of applicable pallets

- routes pallets to load/unload area

- gives instructions to operator about desired parts via a data entry unit (DEU)

 

• Traffic Control

- Regulates materials transfer system to ensure parts are moved between desired workstations. This may be problematic, depending upon the transportation system used. Can act like a railway switch operator.

 

• Shuttle Control

- moves parts between stations and main conveyor

- coordinates actions between machines, and primary handling system

 

• Work handling system monitoring,

- monitor both work parts, and pallets.

 

• Tool Control

- tracks tools at each station (and reroute parts if necessary, or notifies operator to install parts)

- tool life monitoring, and operator orders for replacement

 

• System performance monitoring and Reporting

- Generate management reports

 

1.2.2 Data Files Required in a FMS system,

 

• Part program file

- numerical control files for each part, and for each machine which may make a part

 

• Routing File

- A list of machines which the parts must be routed through for completion, including alternates in some cases.

 

• Part Production File

- Production parameters for each workpart

- production rates

- allowances for in-process inventory

- inspections required

- etc.

- used for production control

 

• Pallet reference file

- a record of which parts a specific pallet is fixtured for

- each pallet is individually identified

 

• Station Tool File

- a file for each workstation identifies,

- codes of cutting tools at station

- used for tool control purposes

 

• Tool-life file

- keeps tool-life value for each tool in the system for comparison with maximum value.

 

1.2.3 System reports generated by an FMS system,

 

• Utilization Reports

- summarize individual, and group efficiencies for stations.

 

• Production Reports

- daily and weekly reports of parts produced in the FMS

 

• Status Reports

- a snapshot of present conditions in the FMS system for,

- tools

- parts

- stations

- pallets

- etc

 

• Tool Reports

- list of tools at (or needed at) a workstation

- tool life status reports

 

• A Graphical Depiction of a Workstation Controller