The Program

Program’s Main Screen

Data Exchange between ControlLogix PLC and Siemens S7 PLC

- This program exchanges two kinds of data registers:  The first type is Real Array registers and the second type is a Double Integer register (Dint).  

- The Real Registers are a Real array and consists of 2 to 50 registers.   The number of registers are defined in both PLCs and the exact number exchange is give by the ‘Array Length’ variable.  The length can be from 2 to 50 registers.  The array length shown here is for a 10 element array.

- The Double Integer (Dint) register is one registers that is used to transfer discrete values back and forth.  The definition of the Dint register in the ControlLogix processor is a single Dint register.  However, in the Siemens S7 a Boolean Array from 0 to 31 elements is defined for the exchange.

- The bit positions are preserved from the ControlLogix and Siemens S7.  Meaning if ControlLogix bit ‘0’ is set to 1 the corresponding Siemens S7 Boolean array position ‘0’ will be set to ‘1’ (True).

- Note: To access a Program tag array (as opposed to a Global tag array), use this format:

Program:MainProgrm.To_Siemens_Real