Distributed embedded systems Outline
Distributed embedded systems Outline
Distributed embedded systems Outline
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<strong>Distributed</strong> state variables, {M1, M2, M3}<br />
=> the system state; is it consistent?<br />
Message M’<br />
Com.<br />
controller<br />
Computer<br />
hardware<br />
and<br />
software<br />
Drive<br />
circuitry<br />
Signal<br />
conditioning<br />
Actuator(s)<br />
Sensor(s)<br />
Com.<br />
controller<br />
Computer<br />
hardware<br />
and<br />
software<br />
M 1<br />
M 2<br />
Drive<br />
circuitry<br />
Signal<br />
conditioning<br />
Actuator(s)<br />
Sensor(s)<br />
Com.<br />
controller<br />
Computer<br />
hardware<br />
and<br />
software<br />
M 3<br />
Drive<br />
circuitry<br />
Signal<br />
conditioning<br />
Actuator(s)<br />
Sensor(s)<br />
When is the state required to be consistent?<br />
Consistency in the precense of faults?<br />
Trade-offs --> compare voice vs. file transfer!<br />
Martin Törngren, Sept. 2010 – <strong>Distributed</strong> <strong>systems</strong><br />
Embedded <strong>systems</strong>,course, MF2042<br />
23<br />
Time delays in distributed<br />
<strong>systems</strong><br />
Sending Node<br />
Receiving Node<br />
Application<br />
Access Control<br />
prep.,<br />
send<br />
wait<br />
decode,<br />
retrieve<br />
Application<br />
Access Control<br />
Comm. Interf.<br />
Comm. Interf.<br />
transmission<br />
Martin Törngren, Sept. 2010 – <strong>Distributed</strong> <strong>systems</strong><br />
Embedded <strong>systems</strong>,course, MF2042<br />
24<br />
12
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