PA ROUTERS To create a smooth network transition between PROFIBUS DP and PROFIBUS PA, the SIMATIC product range offers two versions: the DP/PA coupler and the PA link. The following criteria can be applied when choosing the network transition: DP/PA coupler: For small quantity frameworks (volumes of data) and low timing requirements; limiting of data transfer rate on the PROFIBUS DP to 45.45 kbit/s PA link: For large number of stations and high cycle time requirements; data transfer rate on the PROFIBUS DP up to 12 Mbit/s Configuration examples for PA link and DP/PA coupler Page 1968 Mar 2008 Siemens ITS
PA link The PA link is a modular combination in S7-300 design consisting of the IM 153-2 High Feature 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. The use of active bus modules as backplane bus allows hot swapping of individual modules and redundancy of the IM 153-2 High Feature PROFIBUS DP interface modules and the FDC 157-0 DP/PA coupler. 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 interface module for PROFIBUS DP, it is also recommendable to have a redundant 24 V DC supply, e.g. with two PS 307/PS 305 load power 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. Page 1969 Mar 2008 Siemens ITS
The following basic components are available for configuring the PA link: IM 153-2 High Feature interface module for extended temperature range DP/PA coupler (Ex [i] and FDC 157-0) Components for redundant design and for hot swapping Mounting rail for hot swapping (as an alternative to the standard mounting rail) BM PS/IM for 1 load power supply and 1 IM 153-2 High Feature module, for extended temperature range IM/IM (IM 157) bus module for two IM 153-2 High Feature modules, for redundant and non-redundant design and for extended temperature range BM FDC for 1 DP/PA coupler Ex [i] or FDC 157-0, for extended temperature range (up to 5 DP/PA couplers possible per PA link) BM FDC/FDC for 2 DP/PA couplers FDC 157-0, for extended temperature range Additive option: PS 307 load power supply for 120/230 V AC; 24 V DC, version in 2, 5 or 10 A, or PS 305 load power supply for 24/48/60/110 V DC; 24 V DC, 2 A Technical specifications Page 1970 Mar 2008 Siemens ITS
Technical specifications DP/PA coupler Bus connection Connection for PROFIBUS PA Connection for PROFIBUS DP 2 terminals of a 4-pole screw-type terminal, integral terminating resistor 4-pole screw-type terminal for connection and looping through, selectable terminating resistor 9-pin Sub-D plug, contact assignment as described in IEC 61158/EN 50170 Page 1971 Mar 2008 Siemens ITS
Module-specific data Degree of protection IP20 Transmission rate on PROFIBUS DP 45.45 Kbit/s Transmission rate on PROFIBUS PA 31.25 Kbit/s Communication protocol PROFIBUS DP Voltages, currents, potentials Supply voltage 24 V DC (20.4 V... 28.8 V) Reverse polarity protection Overvoltage protection Voltage at coupler output (PA) 13 V... 14 V DC 31 ± 1 V DC Voltage monitoring 15.5 V Overvoltage monitoring U > 35 V; latching cutoff Voltage failure bridging Min. 5 ms Current at coupler output (PA) for supplying the PA field devices max. 110 ma max. 1 A Galvanic isolation 24 V DC PROFIBUS DP/PROFIBUS PA PROFIBUS DP/supply PROFIBUS PA/supply All electric circuits/functional grounding Page 1972 Mar 2008 Siemens ITS
Power consumption of modules (24 V DC) Max. 400 ma max. 2.3 A Power loss of the module Typ. 7 W Typ. 13.4 W Status, interrupts, diagnostics Diagnostics displays DP/PA coupler Ex [i] and DP/PA coupler FDC 157-0 PROFIBUS DP bus monitoring Yellow LED "DP" PROFIBUS PA bus monitoring Yellow LED "PA" 24 V DC power supply monitoring Green "ON" LED Additive diagnostics displays of the DP/PA coupler FDC 157-0 Group error Red LED "SF" Bus error Red LED "BF" Monitoring DP/PA coupler (active coupler in Yellow LED "ACT" redundant configuration) Climatic conditions Permissible operating temperature DP/PA coupler Ex [i] and DP/PA coupler FDC 157-0 Horizontal installation -25... +60 C Vertical installation -25... +40 C Page 1973 Mar 2008 Siemens ITS
Dimensions and weight Dimensions (W x H x D) in mm 80 x 125 x 130 Weight approx. 550 g Approx. 515 g IM 153-2 High Feature (for extended temperature range) Function Bus connection Connection for PROFIBUS DP Linking of PROFIBUS DP (9.6 Kbit/s to 12 Mbit/s, slave functionality) and PROFIBUS PA (master functionality) with support of the "Configuration in Run" function The DP/PA link function is only implemented by extending the IM 153-2 High Feature with one or more DP/PA couplers. Stand-alone operation of the IM 153-2 High Feature is not possible. 1 Y coupler, up to 5 DP/PA couplers or up to 64 slaves can be connected Isolation from the higher-level DP master system 9-pin Sub-D plug, contact assignment as described in IEC 61158/EN 50170, Vol. 2 Page 1974 Mar 2008 Siemens ITS
Connectable lower-level components Number of couplers DP/PA coupler max. 5 Y coupler 1 Number of PA devices on PROFIBUS PA max. 64 Module-specific data Degree of protection IP20 Transmission rate of the higher level DP master 9.6; 19.2; 45.45; 93.75; 187.5; 500 Kbit/s; system 1.5; 3; 6; 12 Mbit/s Communication protocol PROFIBUS DP Frame length I/O data Max. 244 bytes Configuration frame Max. 244 bytes Diagnostics frame Max. 244 bytes Parameter assignment frame Max. 244 bytes Voltages, currents, potentials Supply voltage 24 V DC (20.4 V... 28.8 V) Reverse polarity protection Voltage failure bridging 20 ms Galvanic isolation to the higher-level DP master system to the DP/PA coupler or Y coupler No Power consumption of modules (24 V DC) In the PA link Max. 200 ma (at 20.4 V) Page 1975 Mar 2008 Siemens ITS
in the Y link Max. 400 ma (at 20.4 V) Power loss of the module In the PA link Max. 2.6 W (at 28.8 V) in the Y link Max. 3.6 W (at 28.8 V) Infeed, mechanical design Status, interrupts, diagnostics Diagnostic displays Group error Red LED "SF" Bus error on higher level DP master system Red LED "BF 1" Bus error on underlying bus system Red LED "BF 2" Module is active in redundancy mode Yellow LED "ACT" 24 V DC power supply monitoring Green "ON" LED Climatic conditions Permissible operating temperature Horizontal installation -25... +60 C Vertical installation -25... +40 C Dimensions and weight Dimensions (W x H x D) in mm 40 x 125 x 130 Weight 4-pin screw terminal, short-circuiting link between PE and M24; the short-circuiting link must be removed for floating operation (independent of this, the DP interface is always floating) approx. 360 g Page 1976 Mar 2008 Siemens ITS