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The threads that wouldn't die...
- PC reliability?
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- Where do we go from here?
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- 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
The greatest dangers to liberty lurk in insidious encroachment by men
of zeal, well-meaning but without understanding.
-- Justice Louis D. Brandeis
of zeal, well-meaning but without understanding.
-- Justice Louis D. Brandeis
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from the Honeywell EPKS Modbus department...
ModbusRTU Write Coil with Pulse output
We have Honeywell EPKS DCS at our site. We have Terminal server for all the Modbus communication. And we are using 485 to RS232 converter in order to get long distance. The problem here is we could establish communication and everything is fine. But once if I write to the Coil, we have the readback at DCS, it says Control failed at sometime but all the time it is writing as desired. After that we are getting alarm for Control Failed. We need Pulse output with 4 secs duration. Sometimes it is working as a Pulse output but sometimes it holds at Logic 1 and is not coming back to 0.
If anyone came across this problem, could you please help in this regard.
Prakashkumar N
If anyone came across this problem, could you please help in this regard.
Prakashkumar N
From Control Engineering magazine...
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Above articles copyright 2008 Reed Business Information.
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