Siemens 6ES7157-0AC85-0XA0 SIMATIC NET FDC 157 PROFIBUS PLC Communication Module

The Siemens 6ES7157-0AC85-0XA0 is the Field Device Coupler FDC 157, a SIMATIC NET PROFIBUS DP to PA / Foundation Fieldbus H1 physical-layer coupler with an integrated bus-powered supply of up to 1 A for up to 31 field devices. It runs from 24 V DC, offers redundancy capability, and is rated IP20 for an extended -25 to 60 °C temperature range.

Technical Specifications

Selection Notes

The FDC 157 couples a PROFIBUS DP segment at up to 45.45 kbit/s to a PROFIBUS PA or Foundation Fieldbus H1 segment at 31.25 kbit/s, so it sits at the transition point where DP-side controllers need to read PA/FF field instruments without a separate power supply for the field segment - the integrated bus supply feeds up to 31 devices at up to 1 A total. Redundancy capability lets a second coupler back up the same field segment, relevant when the PA-side instruments sit on a process loop that cannot tolerate a single point of failure. IP20 limits mounting to a cabinet or enclosure rather than direct field installation.

Applications

Physical-layer coupling point between a PROFIBUS DP automation network and PROFIBUS PA or Foundation Fieldbus H1 field instruments, such as process transmitters and positioners, mounted inside a control cabinet.