Hi all,

I've been trying to get modbus communication running on a 1511F-1 PN CPU (6ES7 511-1FK02-0AB0) and I'm having trouble even getting started. I've started out with the "Master-Slave Communication via a CM PtP using the Modbus RTU Protocol" sample but if I change the CPU type to the correct one I get the error "The 'Modbus_Comm_Load V3.0' data type is not supported on this CPU or by the current library version."

I'm using TIA portal 15 and I seem to be using the latest firmware version on the CPU. I've got CM PtP RS422/485 HF modules as recomended by this article "Which hardware and software components do you need to establish communication between SIMATIC S7 stations and third-party devices using the MODBUS RTU protocol?" but the only thing it says about the CPU is "The SIMATIC S7-1500 station can be used as Modbus Master (RTU) or Modbus Slave (RTU).".

Am I missing something obvious here?

Many thanks,

Ben.

Hello,

I think there are newer Versions of these instructions available for your plc.

In TIA portal => Task card "instructions" => communication ==> Modbus

you can change the version of the blocks.