Hello,

I wasn't seeing the "using local option file" message and solved the problem by putting "Plc" in the BuildOPtions PlcProcess field. Thus the name of the option file became plc_"NODE"_"BUS_ID"_plc.

Thanks very much,

Eduardo

your welcome

Hello,

How to read a single byte from the PLC via Nodave_Transaction?
There are ChanIi and ChanIo which are 32-bit, but we need to read/write a single byte from/to a PLC DB...

Eduardo Fiss Beloni

Hello,

I think it is not a problem to read an integer instead of a byte? You can split the integer into bytes and use the one You need.
For writing for example writing to byte 3: Read integer 0 (is byte 0, 1, 2 and 3) change the byte 3 part and write the complete integer.
It is a bit slower than just writing but may be this wil do?

Frans

The Proview Io and Ii signals are 32-bit integers, but it's the Representation attribute in the ChanIi and ChanIo that defines the format in the message. Set this to Int8 and it will be a byte.

/Claes

i've been studying this post and others to help solve my problems, but have come to the end of my abilities

i'm trying to use nodave much like the others, with a slight twist. I'd like to use Serial and AS511 as the protocol.

I have libnodave installed and can run the testAS511 program and access my PLC.

i'm using /dev/ttyUSB1 as my device and i've made sure its writeable by user pwrp.

i've added in the buildoptions for nodave and confirmed the option is added

when i start up the runtime and check messages, i see the typical error that others have reported

Failed to initialize io, %IO-E-ERRINIDEVICE, initialization device '%s*

Thinking that maybe serial / AS511 wasn't fully supported I tried to use some of the other protocols even though I don't have a PLC available as such. That didn't seem to work either.

Any pointers you could offer would be appreciated