Reading and Writing a STRING_30 Data Type with CLX

[gustavson]

Hello,

First of all ,thank you for providing such a great tool!

After testing reading and writing options to a ControlLogix PLC using the EthernetIPforCLXCom1 driver, I came to an issue. I can't read or write to a STRING_30 data type tag. It's an Overflow Exception that is triggered and I wonder if my call is wrong, or perhaps it is not possible to read/write to these data types as yet.

What I'm doing is simply trying to read a tag like this:

EthernetIPforCLXCom1.Read("z_Test_String_30")

and for writing:

EthernetIPforCLXCom1.Write("z_Test_String_30", "test")

I've also tried reading this tag as an array, like this:
EthernetIPforCLXCom1.Read("z_Test_String_30", 5), but still without any luck, I still get an Overflow Exception triggered in DLL(MyDLLInstance).ReadTagValue(PLCAddressByTNS(Sequencenumbershort), numberOfElements, CUShort(SequenceNumber))

Could anyone help me clarifying this please? Thanks.

Cheers,
Alex

[Archie]

The ControlLogix driver can only work with the default string length, which I think is 88 characters.

[gustavson]

Thanks Archie. Got it working using the default string type and it's all good.