Custom Interface Instructions (CIs) for the Siemens WinAC Soft PLC allow the addition of new instructions to the PLC’s standard instruction set. These instructions are used the same way as the built-in instructions, such as Add (ADD_I) or Jump (JMP). This extensibility of the instruction set allows easy customization of the Soft PLC to suit any needs.
The Advanced Engineering CI for Siemens WinAC PLC allows PLC programmers to read and write data to up to 256 available serial ports. Configuration settings such as baud rate, data bits, parity, and termination characters are specified for each serial port. Once the serial port is opened, reads and writes to that port may be performed. This is all done without code outside of the PLC.