SIMATIC DP, interface DP/PA-link A. ET 200M IM 153-2 HF for expanded temperature range for max. 12 S7-300 modules, with redundancy, time stamping FIT for isochrone mode new features: up to 12 modules can be used slave initiative for drive ES and switch ES extended data for hard secondary variables operation w. 64-channel modules 32 signals/slot