Good day,

I have CPU 1512SP-1 PN.

I need sending:

Array of Bools

Array of Reals

and receiving Array of Bools.

To/from one ModbusTCP client.

Could you please help me how to configure MB_SERVER block/blocks?

Should i use one or multiple instances of MB_SERVER?

How should I put the data in MB_HOLD_REG?

How to address bools, reals and write bools in client? (where to start 3000X, 1000X, 0000X)

I want to communicate with the PLC using one IP address and one slave ID.

Thank You

Hello,

is really easy to find similar Topics (exactly explained by me f.ex.) on Forum where this problematic is described and explained, mostly to exact problem of user situation. Look inside this Conference a few Topics bellow yours:

Read Coils and Inputs with Modbus protocol

Hope you understand that this problematic isn't easy to describe on one page. Generally help in TIA is enough to understand how this system is working. Becxause Modbus is standard, you can also check general problematic with Modbus RTU data accessing, also inside TIA help about RTU blocks where registers are described and what memory and areas they occupy.

Just one example and logical tip. To understand Modbus system, Holding register can be defined with WORD data type as general access so it is typical one register length. How to access then REAL value in this memory? Easy and logical if you think how many WORDs use REAL data type, then LEN parameter can define how much WORDs you want read/write. This also explains that REAL value is nothing else than 2 WORDs value inside your Holding register at specific offset