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Thermal Overload
The threads that wouldn't die...
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
Fortune
There is no cure for birth and death other than to enjoy the interval.
-- George Santayana
-- George Santayana
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from the Automation List department...
Ethernet...Ethernet is envisaged as a de facto standard for communication but its usage at field instrument level is not commonly in vogue. I mean, at instrument level bus networks like Fieldbus, Modbus, CANbus, are mostly implied renouncing ethernet despite its COTS trait.
Would anybody help me to get out of this fix?
Would anybody help me to get out of this fix?
The CAN (and other similar) networks are targeted at low I/O count applications, while Ethernet does everything else. The CAN type networks allow for simpler hardware at the device node and simpler cabling, but they have very limited capacity. In other words, you would use Ethernet to an I/O rack or block, but a CAN or ASI network to an individual sensor or relay.
It's not an either/or choice. You can use both in different parts of the same system, and connect them together using gateways.
There are also some other networks that are targeted at process industries, due to special requirements there.
It's not an either/or choice. You can use both in different parts of the same system, and connect them together using gateways.
There are also some other networks that are targeted at process industries, due to special requirements there.
From Control Engineering magazine...
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