Reading REAL (Float) Values via Modbus RS485?

[alexander.hefner]

Hi,

please see here…

Reading Floating point value from modbus slave

Hello experts, I have configured x20 CPU as modbus master and communicating with modbus slave with ModbusTCP_Any. I wanted to read the floating point value from the slave. For this: I have defined two consecutive 16 bit register to hold the floating values. in TCPAny configuration, created block 1 for FC 3 with 2 channels: UNIT I can see the values forced by the slave in the configured channels but don’t know how to realize/get the final floating point value. Please guide!

… and here

Modbus, FLOAT to REAL Convert

AS4.12.8.41 SP CPU CP0410 Runtime J4.93 Reading a FLOAT value via Modbus. In Older CPU (not arm and AS3) I have been able to read the value in a REAL array directly. Now I have to save it in an Array of data type UINT. Then convert this to REAL as below. Can I convert this variable on a another way than this? (this works to) VAR u32 : UDINT; Damperflow : REAL; readarray1 : UINT[1..2] END_VAR u32 := SHL(UINT_TO_UDINT(readarray1[1]), 16) OR UINT_TO_UDINT(readarray1[2]); brsmemcpy(AD…

Best regards!