Page 240 - Sensors and Control Systems in Manufacturing

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Cha p te r
F o u r

an FMS, it was decided to divide development of the diagnostics pro-
gram into three major blocks (Fig. 4.2):
• Analyzing the existing design
• Setting up diagnostics that are machine-based
• Choosing important points in the flexible manufacturing cells
where critical failure can occur and where sensors are mounted
• Setting up a diagnostic decision system for the hardware system
• Establishing a workpiece-based diagnostic system that is
actually part of quality control

The flexible manufacturing cells were divided into control vol-
umes (as shown in Fig. 4.3 for the turning cell). For the turning cell,

FIGURE 4.2 Diagnostics for an FMS.

FIGURE 4.3
Hardware control
volumes in a
manufacturing cell.

d d c b a
S/W control S/W control S/W control S/W control
volume volume volume volume
p4 p3 p2 p1
Control volume identification