 Configuration examples for PA link and DP/PA coupler PA linkThe PA link is a modular combination in S7-300 design consisting of the IM 153-2 High Feature Outdoor PROFIBUS DP interface module (with optional redundancy) and up to 5 DP/PA couplers (FDC 157-0 or Ex [i]). All components of the PA link are interconnected through the S7 backplane bus. Use of active bus modules on the backplane allows hot swapping of individual modules and redundancy of the IM 153-2 High Feature Outdoor PROFIBUS DP interface modules and the FDC 157-0 DP/PA couplers. If redundancy and changes during operation are not required, passive bus connectors can be used instead of active bus modules. The PS 307 or PS 305 load power supply can be used for the 24 V DC. With a redundant IM 153-2 High Feature Outdoor PROFIBUS DP interface module, a redundant 24 V DC supply is also recommended, e.g. using two PS 307/PS 305 load current supplies. The PROFIBUS PA bus segments designed with the DP/PA couplers are physically separated as regards current infeed, but form one bus system in communication terms. A PROFIBUS PA ring segment or a PROFIBUS PA line segment with coupler redundancy can be operated on a PA link. Further PROFIBUS PA line segments can be operated on this PA link using individual couplers. The FDC 157‑0 DP/PA couplers provided for the ring coupling or coupler redundancy must always be located at the right-hand end of a sequence of up to 5 couplers. The following basic components are available for configuring the PA link:
Additive option:
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