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Modbus Master RTU with digital inputs

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#1 Chrissi


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Posted 01 October 2006 - 08:52 AM

Hello together,

this is my first posting here.
You have an nice and useful forum and I hope you can help me
with my small probem.

I am searching for a small PLC with min. two digital inputs that act as Modbus Master RTU over RS485
(8 Databits, no parity, 2 Stopbits) half duplex.
It only have to support function code 6 .(more is OK but not needed)
The device should be connected to a Modbus Slave and by setting one of the digital
inputs it have to write a selected value to a register (40XXX) by using FC 06. If the digital input is .
not setted it have to write an other selected value to the same register.
It is also possible to realize it with two digital inputs setted alternately.
I have found a device I can use at WAGO.com (WAGO I/O series) but it is expensive
and the software also.
If somebody have a tip, a link or something else please let me know.

Many thanks


#2 Steve Bailey

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Posted 01 October 2006 - 06:59 PM

The DL05 and DL06 PLCs from Automation Direct PLCs can be Modbus RTU masters.

If price is your primary consideration, the DL05 prices start at $99.
The DL06 starts at $199 but it includes easier to use serial read and write instructions in its function set.


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