FAQs on PROFIBUS DP
Contents
1. Question Can time stamped indications be transferred via PROFIBUS DP from the SIPROTEC device to the PROFIBUS DP master and what prerequisites are to observe Is the restriction for time synchronization via Y Link also valid for transmission of indication with time stamps November 13th 2007 FAQs on PROFIBUS DP Transmission of Indications with Time Stamp Answer Yes with the following preconditions e Select a PROFIBUS DP mapping file for the SIPROTEC device that supports the event list mechanism via PROFIBUS DP available for all SIPROTEC devices except 7VK6 and 7SJ602 e The PROFIBUS DP master PLC must be programmed to read the time stamped information according to the handshake mechanism described in our PROFIBUS DP Communication profile user manual gt You find the manual in the communication modules user manuals directory on www siprotec com e The SIPROTEC device should be time synchronized via PROFIBUS or another method like e g IRIG B This is not necessary but recommended for evaluation of time stamps No Indications with time stamp can also be transmitted to the PROFIBUS DP master if the SIPROTEC device is connected to a Y Link which do not support time synchronization via bus Use then e g IRIG B or DCF for external time synchronization of the devices over port A S EMENS siemens russia com2. DP modules What is a GSD file used for and where to get it from Can see the parameterized PROFIBUS DP address of the SIPROTEC device in one of the devices menus in the display Can replace a SIPROTEC communication modules HW revision 2 with a communication module HW revision 4 and must adapt the device parameterization November 13th 2007 FAQs on PROFIBUS DP General PROFIBUS DP and SIPROTEC PROFIBUS DP Modules e 6 MB s with SIPROTEC RS485 PROFIBUS modules and e 3 MB s with SIPROTEC fiber optical PROFIBUS modules A GSD file describes the technical data of the PROFIBUS DP device and it is required for the bus configuration Every manufacturer has to deliver a GSD file for its PROFIBUS DP device For the SIPROTEC devices there exist two GSD files one for devices with RS485 PROFIBUS module and one for devices with fiber optical PROFIBUS module gt You find these GSD files in the communication modules user manuals directory on www siprotec com Yes this is possible with Communication module from HW revision 4 and a SIPROTEC device firmware 4 6 or higher if such a firmware version is already available for the device type Select MENU gt Test Diagnosis 5 gt Modulinfo 5 gt Port B SIPROTEC communication modules HW revision 2 can be replaced directly by the same type of a communication module HW revision 4 without any changes of the device parameteri zation Please note that communication modules from H
3. the max baud rate of 3 MB s of the SIPROTEC fiber optical modules a disadvantage for the customer Are there special configuration settings for fiber optical ring topologies to observe in the PROFIBUS DP master What is the order number of the Optical Link Modules OLMI G12 e g for connecting SIPROTEC devices with fiber optical PROFIBUS DP interface to a PROFIBUS DP master with RS485 interface November 13th 2007 FAQs on PROFIBUS DP Fiber Optical Interfaces and Networks Depending on the data transmission rate 187 5 kB s gt 55 500 kB s and 1 5 MB s gt 41 The SIPROTEC fiber optical PROFIBUS modules use different fiber optical transmitter and receiver which only support 3 MB s No let s take an example With about 40 PROFIBUS devices 100 bytes to transfer in input and output direction sum of both and 1 5 MB s the bus cycle time of the PROFIBUS DP system is approx 40 ms which is normally faster than the cycle time of the PLC Yes set Retry Limit 3 and the Number of OLM equal to the sum of Optical Link Modules OLM and SIPROTEC devices with fiber optical module in the ring every fiber optical module contains an OLM This must be observed because of transmission delays of the OLM gt A separate Service Info SIPROTEC with fiber optical PROFIBUS DP Modules is available in the communication modules user manuals directory on www siprotec com PROFIBUS OLM G12 V3 1 6GK1502 3CB10 up to 09 200
4. 7 PROFIBUS OLM G12 V4 0 6GK1503 3CBO0 from 10 2007 Page 6 S iIEMENS slemens russla com Question We want to connect SIPROTEC devices to a redundant PROFIBUS DP master system S7 400 H Is this possible Is there an example for network configuration with Y Links available or do driver blocks for PCS7 exist How many SIPROTEC devices can be connected to a Y Link How many Y Links do need November 13th 2007 FAQs on PROFIBUS DP Redundant PROFIBUS DP Networks Answer SIPROTEC devices have a single non redundant PROFIBUS DP interface In order to connect them to a redundant PROFIBUS DP system with a S7 400 H so called Y Links are necessary These Y Links are devices from Siemens A amp D which are used for connecting non redundant PROFIBUS DP slave devices to a redundant S7 400 H PROFIBUS DP master system Order no for Y Links e g 6 S7197 1LA11 OXA0O Please refer to our Application Web Page www siprotec de gt Applications gt Communication There you find a description of a PCS7 driver block from IT plant solutions I amp S for connecting a 7UM62 via Y Link to a S7 400 H It depends on the number of input and output bytes which are transferred this is fixed by the selected Standard mappings A Y Link supports at most 244 bytes in the input direction and 244 bytes in the output direction Please add the input and output bytes of the SIPROTEC devices independently and if one sum exc
5. W revision 4 need another firmware version but they are already delivered with the correct firmware version S EMENS siemens russia com FAQs on PROFIBUS DP Electrical RS485 Interfaces and Networks Question Electrical RS485 topologies consist of so called bus segments At most 32 devices with a RS485 interface can be connected to one segment Repeaters are used to expand the bus with i How many devices can be connected to a RS485 bus additional seqments and additional devices The max number of PROFIBUS devices is 126 because of each device needs its unique address in the range 0 125 This is because of the RS485 bus driver load hardware requirement and does not come from the PROFIBUS protocol Why there is a limitation of 32 devices in one segment Terminating resistors have to be enabled at both ends of each RS485 segment Use either the terminating resistors integrated in the plug or on the communication module The terminating resistors need power supply from the device If the device with the terminating resistors switched off switch on the resistors on the device before in the line What do have to know about terminating resistors November 13th 2007 Page 5 9 SIEMENS slemecns russla com Question How many devices can be connected to a fiber optical ring Why does an Optical Link Module OLM G12 support up to 12 MB s and the SIPROTEC fiber optical modules only 3 MB s Is
6. eeds 244 bytes then the device must be connected to the next Y Link Page 7 S iIEMENS slemecns russla com Question Can the SIPROTEC devices be time synchronized via PROFIBUS DP Can the SIPROTEC devices also be time synchronized via PROFIBUS DP if they are connected with a Y Link to a redundant PROFIBUS DP system What accuracy can be reached with time synchronization via PROFIBUS DP November 13th 2007 FAQs on PROFIBUS DP Time Synchronization of SIPROTEC Devices via PROFIBUS DP Answer Yes but the master must support this this is not a standard function of PROFIBUS DP VO All S7 400 CPU with PROFIBUS DP master and firmware from V3 and all S7 CP443 5 extended PROFIBUS DP modules as well as the CP 5613 PC card support this gt For SIPROTEC devices connected via Y Link to a redundant system please observe the next question answer Time synchronization via PROFIBUS DP for devices connected via Y Links to a redundant system is only possible with Y Links 6ES7197 1LA11 OXA0 using the IM 157 2 High Feature modules situation in Nov 2007 Other Y Links do not relay the time synchronization messages and therefore time synchronization of SIPROTEC devices then will not be possible Absolute difference of lt 10 ms between the devices For time synchronization of devices connected to a Y Link the absolute difference is lt 20 ms between the devices S EMENS siemens russia com
7. siemens SIPROTEC Devices with PROFIBUS DP on PROFIBUS DP November 13th 2007 Page 1 9 SIEMENS siemens russia com FAQs on PROFIBUS DP Table of Contents Table of Contents 1 References FAQs about General PROFIBUS DP and SIPROTEC PROFIBUS DP Modules Electrical RS485 Interfaces and Networks Fiber Optical Interfaces and Networks Redundant PROFIBUS DP Networks Time Synchronization of SIPROTEC Devices via PROFIBUS DP ee a Se Transmission of Indications with Time Stamp November 13th 2007 Page 2 9 SIEMENS slemecns russla com FAQs on PROFIBUS DP References Please also refer to the following manuals Siemens AG PTD EA Manual SIPROTEC4 Communication module PROFIBUS DP Communication profile C53000 L1840 B001 03 Revision from V4 0 www siprotec com gt Prot Devices gt General information gt Complete documentation to all communication modules and protocols gt PROFIBUS DP Siemens AG PTD EA Manual SIPROTEC4 Communication module Device specific PROFIBUS DP Bus mapping documentations one manual per device type e g for 78J61 62 63 64 7UM61 7UM62 7SA522 7SA6 etc www siprotec com gt Prot Devices gt General information gt Complete documentation to all communication modules and protocols gt PROFIBUS DP November 13th 2007 Page 3 9 SIEMENS SICMCNS FUSSla CIM Question Which max data transfer rates baud rates are possible with PROFIBUS DP and SIPROTEC PROFIBUS
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