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Operating Instructions

1. 9185 11 Slave Slave 9185 11 Slave m3 T3 9 N 5 z i g amp RS 485 Exi 5 RS 485 Ex i Q o 9 a Slave 1 oe Slave 1 SB Slave 2 gt Slave 2 e e 10 Slave 10 Fig 2 RS 485 Ex i conform to the R STAHL specification with fieldbus isolating repeater type 9185 Figure 2 shows the principle structure of an RS 485 bus system with intrinsically safe RS 485 Ex i segments in accordance with R STAHL specification and the bus terminating resistors to be installed UART protocols such as Profibus DP Modbus RS 485 HART or the Servicebus of R STAHL are used as the protocol In this example the 9185 11 fieldbus isolating repeater is set to RS 485 Ex i in accordance with the R STAHL specification Furthermore the Sub D connector type type 94 900 03 22 0 must be used The number of fieldbus devices which can be connected to a network is limited by the address space of the bus protocol used see 4 7 The RS 485 interface limits the number of fieldbus devices per physical segment to 32 11 Ex i all devices connected to the segment such as master slaves repeaters and isolating repeaters etc connected to the segment are considered as fieldbus devices If more than 32 fieldbus devices are used in a network repeaters or isolating repeaters must be provided for further physical segments Segment 1 is extended via 2 fieldbus isolating repeaters Type
2. Cascading Cascading and 1 fold 2 fold fold Master Master Master RS 485 RS 485 RS 485 fa Slave amp Slave S Slave E r oO o o E E E D D D Loy Do Do Oo ao 7 Slave Slave Slave Slave ea 9185 12 9185 12 9185 12 NI RS 485 RS 485 RS 485 9373 xx x a 5 Slave 5 Slave S Slave E E 3 RS 485 Ex i RS 485 Ex i p p ao ao 7 N NN Slave F Slave Slave Slave Slave ao Slave ae Slave 9185 11 9185 11 RS 485 IS RS 485 IS oO ka oO o Slave 2 Slave 5 D 2 ao Slave Slave Fig 4 The illustration on the left indicates single cascading There is a maximum of 1 type 9373 21 isolating repeater between the master and any slave The illustration in the centre indicates double cascading Two type 9185 fieldbus isolating repeaters are arranged between the master and the most distant slave The right hand illustration shows a combination of the two others R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 4 13 Sub D connector for the fieldbus Only Sub D connectors approved by R STAHL may be employed for the intrinsically safe segment of the fieldbus The connectors are provided with a connection for an incoming and an outgoing cable
3. e A mix of devices with differing specifications is not permitted unless this is expressly allowed e CPM Type 9440 22 e CPM Type 9440 12 e Fieldbus isolating repeater Type 9185 11 Fieldbus isolating repeater Type 9373 21 e Fieldbus isolating repeater fibre optic Fieldbus isolating repeater fibre optic Type 9372 1 1 21 30 1 Type 9372 1 1 21 30 e Sub D connector for RS 485 IS e Fieldbus isolating repeater fibre optic Order code 94 900 02 22 0 Type 9372 11 21 20 e Sub D connector for RS 485 Ex i Order code 94 900 03 22 0 Warning Standard PROFIBUS connectors must not be used in an intrinsically safe bus segment 1 Length of the intrinsically safe bus maximum 100 m with maximum 5 fieldbus devices Activation of the terminating resistor on the 9372 and deactivation in the Sub D connector 4 5 Bus length RS 485 RS 485 IS and RS 485 Ex i Max length of a bus segment if using standard PROFIBUS cable Type A see Chapter 3 7 Max sum of the lengths of Transmission speed stub lines per segment 1 9 6 to 93 75 kbit s 96 m 1 200 m 187 5 kbit s 75m 1 000 m 500 kbit s 30 m 400 m 1 5 Mbit s 10m 200 m 1 Stub lines along the bus should be avoided Stub lines are generally implicitly present e g the internal connection lines from the Sub D connector to the chip generally amount to up to 20 cm per device These are a part of the stub line length The minimum distance between two fi
4. The terminating resistors are integrated into the Sub D connectors from R STAHL The devices supplied by R STAHL feature two power supply pins for powering the terminating resistor in parallel with the two data line pins The terminating resistor can be connected by means of a switch in the Sub D connector The outgoing bus cable is disconnected from the field bus if the bus termination is activated The Sub D connector type used depends on the fieldbus device used and the bus specification and is described in section 4 2 3 and 0 Description Bus Terminator Order number Sub D connector standard RS 485 none Ex and Zone 2 105715 Sub D connector for zone 1 CPM according to RS 485 Ex Ex i conform 94 900 03 22 0 to R STAHL specification 120 ohms SUBCON PLUS AXIAL Sub D connector for zone 1 CPM according to RS 485 IS conform to PNO 94 900 02 22 0 Specification 200 ohms Sub D connector for zone 1 45 version according to RS 485 IS 201805 R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 19 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 4 14 Additional terminating resistors for the RS 485 Ex i fieldbus according to the R SSTAHL specification when type 9373 21 or 9372 fieldbus isolating repeaters are used The powered terminati
5. 2 Compatibility Components complying with the previous RS 485 Ex i Specification in accordance with R STAHL and components in accordance with RS485 IS Specification cannot be mixed in one bus segment since functional characteristics differ When planning an intrinsically safe RS 485 segment it is necessary to define which of the two specifications the segment is designed to comply with New devices of R STAHL comply with the RS 485 IS specification 3 Definitions RS 485 Fieldbus in safe areas based on a standard RS 485 interface RS 485 Ex i Intrinsically safe fieldbus based on the R STAHL specification RS 485 IS Intrinsically safe fieldbus based on the PNO Profibus User Organisation specification 4 R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 4 Project planning 4 1 Safe area The field bus must be executed as a linear system In general the start of the bus is formed by the bus interface module of a DCS Automation System a repeater or an isolating repeater The end of the bus is formed by the terminating resistor or a repeater Fieldbus devices of the most varied types can be arranged along the bus For example these can be the R STAHL remote I O system I S 1 the R STAHL VOS 200 system R STAHL HART multiple
6. STAHL are used as the protocol The number of fieldbus devices which can be connected to a network is limited by the address space of the bus protocol used see 4 7 The RS 485 interface limits the number of fieldbus devices per physical segment to 32 11 Ex i all devices connected to the segment such as master slaves repeaters and isolating repeaters etc connected to the segment are considered as fieldbus devices If more than 32 fieldbus devices are used in a network repeaters or isolating repeaters must be provided for further physical segments In Figure 1 segment 1 is extended via 2 fieldbus isolating repeaters with 2 physical segments 2 and 3 The maximum number of fieldbus devices in an intrinsically safe segment in accordance with R STAHL specification is 11 Description bus terminating resistor Ordering code Ti Sub D connector standard RS 485 non Ex and Zone 2 105715 T2 Internal bus terminating resistor 470 Ohm at terminals T3 Sub D connector for Zone 1 CPM in accordance with RS 485 Exi 94 900 03 22 0 Not for use in new installations R STAHL Schaltger te GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 4 3 Upgrade from RS 485 Ex i to RS 485 IS Installation When upgrading an old installation according to R
7. value is the same Fieldbus devices according to RS 485 Exi or RS 485 IS must be kept on separate field busses due to functional reasons see chap 4 16 R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area A distinction is made between two cases as regards calculation a All fieldbus devices have the same priority Uo 3 75 V lo lo 14 149 mA 184 mA 2270 mA U AR 1 650hm I 2270mA b Half of the fieldbus devices have positive polarity and half of them have negative polarity Uo 2 3 75 V 7 5V I lo 2 7 149mA 184mA 1227mA oe one i 1 1227mA The values are as follows substituted in the formula above Cas U Ri L R allowed L R cable e a 3 75 V 1 65 Ohm 16 68 wH Ohm gt 15 wH Ohm OK b 7 5 V 6 11 Ohm 15 44 uH Ohm gt 15 wH Ohm OK The permitted capacitance for Uo lt 10 V is 3 uF for IIC This is sufficient at 30 nF km with a maximum fieldbus segment length of 1200 m The permitted total current lo for voltages Uo lt 12 V is 3 33A gt lo asags is lt lo permitted R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 17 Operating Instructions Project planning installation and commissioning of
8. 9185 11 with 2 intrinsically safe physical segments 2 and 3 The maximum number of fieldbus devices in an intrinsically safe segment in accordance with R STAHL specification is 11 Description bus terminating resistor Ordering code Ti Sub D connector standard RS 485 non Ex and Zone 2 105715 T3 Sub D connector for Zone 1 CPM in accordance with RS 485 Ex i 94 900 03 22 0 R STAHL Schaltger te GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area Master RS 485 1 2 3 eee o o 32 Y Segment V V 9373 xx Slave Slave 9373 xx Slave RS 485 Ex i RS 485 Ex i Segment 3 Segment 2 pa Slave 1 gt Slave 1 SB Slave 2 pe Slave 2 10 Slave 10 Fig 3 RS 485 Ex i conform to the R STAHL specification with fieldbus isolating repeater type 9373 Figure 3 shows the basic structure of an RS 485 bus system with intrinsically safe RS 485 Ex i segments in accordance with R STAHL specification and the bus terminating resistors to be installed when type 9373 xx fieldbus isolating repeaters are used UART protocols such as Profibus DP Modbus RS 485 HART or the Servicebus of R
9. a field enclosure near to the hazardous area or in Zone 2 One exception to this rule relates to the fieldbus isolating repeaters for fibre optic strands types 9186 12 11 11 These are normally installed in an I S 1 field station in zone 1 5 5 Measurement of the Profibus cable After installation it is necessary to test its quality There are three ways of doing this 1 Measuring with a multimeter and checking the resistance values This process uncovers short circuits and open circuits and gives information about the cable length 2 Using a Profibus testing instrument e g Nettest This device provides information about short circuits open circuits cable impedance points of interference reverse cable core connections A and B cable length and transmission level of fieldbus devices 3 Measurement by TDR Time Domain Reflection A signal generator Profibus or Modbus Master for edge generation is used for measurement The measurement is evaluated with an oscilloscope This method allows best diagnosis but is complicated and requires great experience interpreting the measured results Nettest can only be used for Profibus If Modbus is to be transmitted via the RS 485 bus measurements can be made using the multimeter Nettest is however an outstanding test instrument for a Profibus network it documents all the measurements and can transfer them to a PC This is particularly useful when verifying the installation Nettest can
10. arene trere ne mr trre Teme a E reer tree errr reer 5 4 3 Upgrade from RS 485 Ex i to RS 485 1S Installation ccceceeeeceeeesseeeeeseeesenees 10 4 4 Usable components 25 cts ss eccasceteteteccatd gaits eae ace ceca s0k see e g eee esate 11 4 5 Bus length RS 485 RS 485 IS and RS 485 EX i eee eee cece eeeeeeeee ee eeeeteeneeeeeeeeeees 11 4 6 Extending the network SUUCtUING iccicicciesctcctsiciecislenisiiesecehdsseteceniendsenstswoieditsaeeiceresdeieise 12 4 7 Address space of the bus protocols ceeeeeceeeeeeeeeeeeeeeeee cess ee eeeeee settee teeenennee 12 4 8 Number of fieldbus devices of an RS 485 segment c cceeeeeeeeeceeeeeeeeeneeeeeeeeeees 12 4 9 Number of fieldbus devices of an intrinsically safe RS 485 IS or RS 485 Ex i bus SOQ MCN ariiraa E egal bezecoese datee etereats 12 4 10 Fieldbus CAIN sien sous Agiesacceteentrqeetis inate teateratesnetete tonne aaa riadatuanenae saan EE a E TETE 13 4 11 Proof of intrinsic safety of a fieldbus installation ccc eeeeeee eee eeeeettee teenies 13 4 12 Maximum number of series connected repeaters ceeeecceceeeeeeeeeeeeeeeeeeeetteeeteeeeeees 18 4 13 Sub D connector TOF the TEIABUS ec csnecsiicainsestns vinatetinmaiioaheacmen Manele vetnemend 19 4 14 Additional terminating resistors for the RS 485 Ex i fieldbus according to the R STAHL specification when type 9373 21 or 9372 fieldbus isolating repeaters are used 20 4 15 Earthin
11. of devices on a physical bus segment dD 2 25A 12 2212 n 0 184A n I Max_devices The maximum number of field devices on the bus may be less for functional reasons than the number stated for technical safety limitation reasons see 4 9 A cable conform to the specifications in 4 10 1 must be used as a field bus cable No concentrated capacitances or inductances are permitted along the fieldbus The Sub D connector type 94 900 03 22 0 supplied by R STAHL are approved for use within the RS 485 Ex i intrinsically safe fieldbus for an ambient temperature of 40 C to 70 C The fieldbus system must be marked as follows at least once in the vicinity of the start of the fieldbus The marking label is provided with the Sub D connectors Eigensicheres Feldbussystem RS 485 Ex i Intrinsically Safe Fieldbus System RS 485 Ex i Sys me de bus de terrain s curit intrins que RS 485 Exi Il 2 G SYST EEx ib IIC T4 0102 PTB 04 ATEX 2089 Ta 40 C 70 C R STAHL Schaltger te GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 15 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 4 11 3 Proof of intrinsic safety of an installation conform to EN 60 079 11 for RS 485 IS and RS 485 Ex i In accordance with EN 60 079 11 2012 Chapter 6 2 3 the maximum external inductance
12. only be used to measure the cable length impedance and junctions in an RS 485 Ex i or RS 485 IS segment Further measurements that can be made using Nettest are designed for a standard RS 485 interface and can thus not be used R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 25 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 6 Commissioning The most important step in commissioning a RS 485 network is the examination of the physical installation and measurement of the bus If this has not been performed it makes poor sense to continue with commissioning 6 1 Bus segment in the safe area For proper functioning of the bus segment the bus must be terminated at both ends with active terminating resistors These resistors can be integrated in the Sub D connectors or in the devices themselves Modern Sub D connectors with switchable terminating resistors isolate the bus cable leaving that point from the bus when the terminating resistors are switched in An unreliable multiple termination of the bus is not possible Simpler troubleshooting by isolation or disconnection of part segments 6 2 Bus segment in the hazardous area See also Chapters 4 13 and 4 14 for ordering information RS 485 IS in accordance with PNO Specification For proper functioning of the bus segment the
13. resistance ratio L R for a source with ohmic current limiting can be determined on the basis of its maximum values Uo and lo The maximum permitted capacitance is determined from the minimum ignition curves The fieldbus devices of R STAHL approved for the RS 485 IS and RS 485 Ex i fieldbus such as 9440 22 9440 12 9185 11 and 9372 11 are certified as single devices with the following maximum values or less in accordance with ATEX Fieldbus device Uo lo Ui Ci and Li 9440 12 01 11 3 72 V 107 mA 3 75 V 0 9440 22 01 3 73 V 149 mA 4 2 V 0 9185 11 35 10 3 73 V 149 mA 4 2 V 0 9372 11 21 20 3 72 V 184mA 3 75 V 0 9372 11 21 30 3 72 V 184mA 4 2 V 0 The technical safety related output voltage of all fieldbus devices is Uo lt 1 3 75 VI This is permissible from a technical safety viewpoint as the minimum Ui 3 75 V L 32 e R Formula for Li 0 o i r e 40 wd for IIC Ro 9 UG The calculation is based on 15 fieldbus devices i e 14 I S 1 field stations and one fieldbus isolating repeater type 9372 11 can be connected The maximum number of field devices on the bus may be less for functional reasons than the number stated for technical safety limitation reasons see 4 9 The calculation considers the use of a 9372 11 this can also be replaced by a 9185 11 In addition it is allowed to use further 9185 11 to replace field stations owing to the fact that the I
14. the RS 485 field bus system of R STAHL for the safe and hazardous area 4 12 Maximum number of series connected repeaters 9373 xx Segment 3 The number of repeaters which can be connected in series depends on manufacturer Repeaters allow a bus segment to be extended e g at 1 5 Mbit s the max segment length is limited to 200 m if a repeater is fitted the segment length is extended by a further 200 m The fieldbus isolating repeaters type 9373 21 are designed for isolation between the safe area and the hazardous area They cannot be used as repeaters As shown in Fig 3 a fieldbus isolating repeater is connected in the safe area to an RS 485 segment thus opening up one RS 485 Ex i segment in each case It is not permitted to extend the RS 485 Ex i segment The fieldbus isolating repeaters type 9185 also perform the function of a repeater in addition to the function of the 9373 21 and thus these units can be used as conventional repeaters in an RS 485 bus segment to extend a bus segment The maximum number of series connected fieldbus isolating repeaters type 9185 is limited to 4 without cable redundancy and to 2 with cable redundancy between any two fieldbus devices Cascading 1 fold
15. the basis of the PTB 04 ATEX 2089 1 Supplement system certificate Conform to RS 485 IS the fieldbus devices can be connected with the maximum values Uo 4 2 V and lo 149 mA with a linear source characteristic The total current of all field devices on the RS 485 IS bus may not exceed 4 8 A Fieldbus devices Uo lo Ui Ci and Li 9440 22 01 21 43 7 V 134 mA 4 2 V 0 9440 22 01 11 43 7 V 134 mA 4 2 V 0 9185 11 35 10 3 73 V 149 mA 4 2 V 0 The technical safety related output voltage of all fieldbus devices is Uo lt l 4 2 VI The maximum current of a fieldbus device is 149 mA which results in the following maximum number of devices on a physical bus segment I 2 eae 32 2 32 n n 0 149A I Max_devices The maximum number of field devices on the bus may be less for functional reasons than the number stated for technical safety limitation reasons see 4 9 A cable conform to the specifications in 4 10 1 must be used as a field bus cable No concentrated capacitances or inductances are permitted along the fieldbus The Sub D connector type 94 900 02 22 0 supplied by R STAHL are approved for use within the RS 485 IS intrinsically safe fieldbus for an ambient temperature of 40 C to 70 C A minimum fieldbus length between two field devices must be observed when installing the fieldbus system Number of field Fieldbus length devices lt 16 gt Om gt
16. 16 gt 1m The fieldbus system must be marked as follows at least once in the vicinity of the start of the fieldbus The marking label is provided with the Sub D connectors Eigensicheres Feldbussystem RS 485 IS Intrinsically Safe Fieldbus System RS 485 IS Sys me de bus de terrain s curit intrins que RS 485 IS C Il 2 G SYST EEx ib IIC T4 0102 PTB 04 ATEX 2089 Ta 40 C 70 C R STAHL Schaltger te GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 4 11 2 Proof of intrinsic safety of a fieldbus installation conform to RS 485 Ex i on the basis of the PTB 04 ATEX 2089 system certificate Conform to RS 485 Ex i the fieldbus devices can be connected with the maximum values Uo 3 75 V with a linear source characteristic The total current of all field devices on the RS 485 Ex i bus must not exceed 2 25 A Fieldbus device Uo lo Ui Ci and Li 9440 12 01 11 3 72 V 107 mA 3 75 V 0 9185 11 35 10 3 73 V 149 mA 4 2 V 0 9372 11 21 20 3 72 V 184 mA 3 75 V 0 9372 11 21 30 3 72 V 184 mA 4 2 V 0 The technical safety related output voltage of all fieldbus devices is Uo lt 1 3 75 VI The maximum current of a fieldbus device is 184 mA which results in the following maximum number
17. Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area R STAHL Schaltgerate GmbH Am Bahnhof 30 D 74638 Waldenburg Wirttemburg Germany Ordering code Version 2 0 Date of issue 16 04 2014 Applicable to S 1 Target group Trained qualified staff in accordance with ElexV IEC 79 17 Subject to change and correction without notice Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 2 R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area Contents Page 1 UO CUI GUO cccceccs sciatica eects ccenase etree tracert et 4 imme 10 11 9c Zane ene nn a en ete noe Oe een iaaeaie 4 cam 21 C0 8 bene eee a On ee a ror Oe aaa iddiada iaa 4 4 Project planning sees cece scesledecececsoesescesencadectvescesacsteccecceacsatesancoectecesccsenstecteceses 5 lity 13 Ut gt gt eee ene ener re eer ene een rte ce RR Ree ear Tee ene rete eee eee rere 5 42 2 F 2 109 60 ogc o s Meare err ne tere the ee
18. S 485 Ex i according to STAHL specification with CPMs type 9440 12 and 9373 21 to the new PNO specification RS 485 IS the following topics shall be accomplished 1 The interface use towards the DCS Profibus Modbus shall always be treated as one system This mean all components connected to the Bus shall be changed at the same time a Fieldbus isolating repeater 9185 11 35 10 i The DIP switch PNO set to ON ii Sub D connector for zone 1 CPM according to RS 485 IS STAHL order no 94 900 02 22 0 or Sub D connector for zone 1 45 version according to RS 485 IS STAHL order no 201805 b Exchange CPM with type 9440 22 and the socket type 9490 11 12 i Sub D connector for zone 1 CPM according to RS 485 IS STAHL order no 94 900 02 22 0 c The profibus cable type A may be used for the new installation 2 With the servicebus interface the components used may be replace partially This allows a transition between RS 485 Ex i and RS 485 IS For the servicebus often several IS 1 stations where to the same servicebus but to different DCS busses If not all IS1 stations are upgraded at the same time it is allowed to operated CPMs with an RS 485 Ex i and RS485 IS interface at the same physical link To do so the following rules shall be observed a Fieldbus isolating repeater 9185 11 35 10 i The DIP switch PNO set to OFF ii Sub D connector for zone 1 CPM according to RS 485 IS STAHL order no 94 900 02 22 0 or Sub D connector for
19. ation of the bus master Mastertools ComProfibus Connection of the bus segment to the bus master Check whether the bus master can access all fieldbus devices gt What quality is achieved error magnitude etc A good bus should not indicate errors in the normal operating state If errors occur these must be eliminated since minor rare errors become serious problems over the course of time R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 27 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 7 Troubleshooting Troubleshooting can be split into two groups a The logical search using a bus analyser that carries out an analysis of the protocol and data link levels This records and plays back telegram traffic It is important to note that the bus analysers partly indicate faults e g defective telegrams and the Profibus master runs without faults special Profibus analyser with Siemens ASPC 2 chip in monitor mode are affected here This means that a bus which is really stable will be tested as bad by the Profibus analyser A serial analyser is suitable for the Modbus or the Servciebus b On the physical level using an oscilloscope This determines how good the construction of the bus segment is This is necessary should the logical examination show that many telegrams have been destr
20. bus must be terminated at the front end with an active terminating resistor On the 9185 the internal terminating resistor in the Sub D connector type 94 900 02 22 0 is switched ON and the DIP switches on the front SCAN and RS2 set to OFF and PNO set to ON The terminating resistor in the type 94 900 02 22 0 connector is switched on at the end of the bus segment RS 485 Ex iin accordance with R STAHL specification If a type 9373 21 fieldbus isolating repeater is used the bus must be terminated on the fieldbus isolating repeater with 470 ohms parallel to the active terminating resistor in the fieldbus isolating repeater If a type 9185 fieldbus isolating repeater is used the Sub D connector type 94 900 03 22 0 must be used on the fieldbus isolating repeater The DIP switches on the front SCAN and RS 2 set to OFF and PNO set to ON see also 9185 operating instructions The end of the bus segment must be terminated by a type 94 900 03 22 0 Sub D connector from R STAHL 26 R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 6 3 Checking and setting the fieldbus devices Address Configuration GSD programming etc Power supply Repeater field bus isolating repeater speed setting 6 4 Commissioning the master Configur
21. ched off The attachment of the bus cable identification must be of a permanent nature R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 23 24 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 1 Fig 9 Zone 2 and safe area Sub D connector The incoming and outgoing cable entries are the reverse on the Zone 1 connector The green wire to A1 and the red wire to B1 for the incoming cable and to A2 and B2 for the outgoing cable Switch in bus termination Incoming cable ml Outgoing cable x JEL A1 B1 ef 102i Fig 9 2 Fig 10 Zone 1 Sub D connector The connectors should be connected as shown in the illustration The green wire to A1 and the red wire to B1 for the incoming cable and to A2 and B2 for the outgoing cable Switch in bus termination Outgoing cable Incoming cable Fig 10 R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 5 4 Installation location and connection of the fieldbus isolating repeaters The fieldbus isolating repeaters can be installed in the switch compartment or in
22. e hazardous area means that no incendive currents or voltages are admitted into the hazardous area Within the hazardous area the equipotential bonding system ensures a constantly good earth connection of all installed systems The individual I S 1 field enclosures must be included in the equipotential bonding system in accordance with valid regulations The cross section of the earthing conductor depends on local conditions such as cross section of the power supply and surrounding metallic construction parts The conductive shielding of the incoming and outgoing fieldbus cable is connected via suitable terminals generally an Ex e terminal to the shielding busbar in the I S 1 field enclosure The shielding busbar itself is connected to the equipotential bonding system If there are doubts in respect of the effectiveness of the equipotential bonding system an equipotential bonding conductor with an adequate cross section must be laid in parallel with the field bus cable The aim of the equipotential bonding conductor is to avoid or limit current flow on the shielding 4 16 Design of safe isolation of the fieldbus cable shielding 22 To the hazardous area To main equipotential bonding bus of the related hazardous area To safe area connection of Pd field bus isolating repeater Fig 8 Example of a fieldbus potential isolating box The fieldbus potential isolating box ensures a neat and safe connection of the fieldbus cable shieldi
23. eeeeee 29 R STAHL Schaltger te GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 3 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 1 Introduction The R STAHL Schaltgerate GmbH company marketed an intrinsically safe Remote I O System as early as 1997 the VOS200 An intrinsically safe variant of the PROFIBUS DP developed by STAHL was used for coupling VOS200 to automation systems This meant that for the first time it was possible to achieve transfer rates of up to 1 5 Mbit s in the hazardous area a speed which greatly exceeds the 31 75 kbits s used on PROFIBUS PA in the Ex i segment The transmission system used on VOS200 will also be used on the successor system the Remote I O System I S 1 However owing to the EX approval only specifically approved components of R STAHL may be connected to such an Ex i bus segment The existing solution has been further developed in cooperation with other manufacturers under the umbrella of the PNO PROFIBUS User Organisation The new specification named RS 485 IS was released in mid 2003 as Profibus guideline Profibus RS 485 IS User and Installation Guideline Number 2262 Rev 1 1 dated June 2003 On the basis of this guideline it will be possible to operate devices produced by different manufacturers jointly on an intrinsically safe bus segment
24. eldbus devices should not be less than 2 m on average so as to avoid an accumulation of the connection capacitance at one position If stub lines branch lines are required they should be physically separated for the continuous bus segments by means of a repeater so as to avoid interference as the result of mismatch R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 11 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 4 6 Extending the network structure If the maximum segment length will be exceeded at a given transmission speed the bus segment must be extended by means of a repeater or the planned transmission speed must be reduced accordingly 4 7 Address space of the bus protocols Protocol Software Address space Profibus DP 0 to 124 Modbus RTU 0 to 127 Servicebus l S Wizard 0 to 127 HART RS 485 AMS Emerson 0 to 127 HART RS 485 Cornerstone ASTEC 0 to 127 HART RS 485 HART Server HCF 0 to 31 HART RS 485 PDM Siemens 0 to 31 HART RS 485 H FDCM Honeywell 0 to 127 HART RS 485 PRM Yokogawa 0 to 31 The bus protocols used must be taken into consideration when assigning addresses to the individual fieldbus devices If a system is planned with for instance 20 Profibus networks and in parallel with this a Servicebus network fo
25. ent consists of a single resistor and not 3 resistors as in a RS 485 segment The bus cable used must have an L R ratio lt 15 uH Ohm and an effective capacitance of lt 30 pF m Safety related verification of the intrinsically safe bus segment can be provided on the basis of the L R calculation conform to EN 60 079 11 or using the PTB 04 ATEX 2089 1 Supplement Intrinsically safe fieldbus system type RS 485 IS or RS 485 Ex i system certificate 10 Only the Sub D connectors provided by R STAHL are permitted R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 4 2 3 Project planning examples Master RS 485 1 2 3 eeeee 32 VV Segment 1 V 9185 11 Slave Slave 9185 11 Slave RS 485 IS RS 485 IS Segment 3 Segment 2 Slave 1 p Slave 1 Slave 2 gt Slave 2 32 T4 Slave 32 Fig 1 RS 485 IS conform to the PNO specification with fieldbus isolating repeater type 9185 Figure 1 shows the intrinsically safe RS 485 IS bus in accordance with PNO Guideline 2262 UART protocols such as Profibus DP Modbus RS 485 HART or the Servicebus of R STAHL are u
26. functional reasons 12 R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 4 10 Fieldbus cable 4 10 1 4 10 2 RS 485 IS conform to PNO specification and RS 485 Ex i conform to R STAHL specification Functional technical data Characteristic impedance approx 150 Ohm 135 165 Ohm Loop resistance lt 110 Ohm km at 25 C Effective capacitance lt 30 nF km Sheath material and colour In accordance with customer s requirements Safety relevant technical data all data must be observed at ambient temperatures from 40 C to 70 C Loop resistance 82 Ohm km to 372 Ohm km L R ratio lt 15yH Ohm Effective capacitance C lt 250 nF km Stranded wire diameter gt 0 1 mm splice protection should be used with fine stranded wires The working inductance or L R ratio is normally not specified by the cable manufacturers since it is of subordinate importance as regards the operating behaviour This parameter is necessary for technical safety considerations of the intrinsically safe RS 485 Ex i RS 485 IS bus The values listed in the tables must be specified by the respective cable manufacturer The cables supplied by R STAHL comply with these values This data describes the standard Profib
27. g of the conductive shielding of an intrinsically safe fieldbus 21 4 16 Design of safe isolation of the fieldbus cable Shielding c cece eee eee eeeeeeeeeeeeeeee 22 5 MSU ANN AUN OU aici cies ttectacian anuna ideaa aaa aaua aiana 23 5 1 Important information on installation and project planning rules s s 23 52 Gable layiNg emer re eee a a rene eer er ey rere tere reer er ere 23 5 3 Connection of the Sub D connectors and Profibus Cables cccccceceseeeeeeeeeeeees 23 5 4 Installation location and connection of the fieldbus isolating repeaters cee 25 5 5 Measurement of the Profibus Cable cccccsccecceeeeceeeeeeeeee teeta eesseaesaaaesaaaesaaeeeaeeeas 25 6 COMMISSIONING scccicecacc cose cecace cesta secs cece sence ccceesiencccsciestaexdectuvdesaedsedieecennn 26 6 1 BUS segment in the safe area aris tries ccaieeteece tees cxtce opdesctaceetrisedinanrasiGsdseceateteceed 26 6 2 Bus segment in the hazardous Af Ca eee cece cette reese eeee eeseaaeaeaaaaaaaesaaeeeaeeeeeeees 26 6 3 Checking and setting the fieldbus devices xciessssinesiemiesnenienstemesieeiten ease 27 6 4 Commissioning the MaStel ccccecceeceeee eee eeee aces ee eeeeeeaaeeeeeeteceaaaeeeeeesseaaaeeeeeeneteaes 27 7 Troubleshooting sssnsnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn mnnn nnnnnnn nnmnnn nnna 28 7 1 Troubleshooting with simple measuring instruments procedure 2 eeee
28. ing and conductor shielding at both ends of the cable and the conductor at intermediate points may be connected to earth if necessary May be connected Installation ground functionwise ae Fail safe connection RS 485 Ex i or RS 485 IS SPs potential RS 485 Ex i or RS 485 IS a separator Fail safe PA connection Switch room e e RS 485 Ex i or RS 485 IS e v Potential equalisation line in and around the hazardous area Fig 7 Earthing of a conductive shield The example in Fig 7 shows one possible structure of a system in accordance with the requirement of EN 60 079 14 2008 12 2 2 3 Section b R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 21 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 1 The shielding of the RS 485 IS or RS 485 Ex i bus must be connected in a fail safe manner to the equipotential bonding line at the crossover between the non hazardous area and Zone 1 2 The equipotential bonding line is led fail safe and with sufficient cross sectional area to the switch compartment This allows the realization of a fail safe type connection of the shield in the switching compartment The fail safe equipotential bonding connection of the conductive shielding before th
29. m The fault behaviour allows conclusions to be drawn as to the method of troubleshooting 3 Setting checking the users bus address terminating resistors and earthing shielding 4 Check whether the correct cable has been used measurement of the loop resistance printed information on cable 5 Check whether all connectors have been connected neatly and correctly stripping the insulation from the cable 6 Are the wires connected screws tightened or wire simply slid beneath open circuit short circuits 7 Switching of the terminating resistors gt how does the bus behave RxD and TxD LED indicators on the fieldbus isolating repeater 8 In some cases deactivation of field stations via the Profibus connectors in order to localise faults 9 Test of Sub D socket for detecting reversed wires 10 The test socket must be connected to the bus cable on the master front end of the bus Then measure the resistance value or 1 10 kOhm with a multimeter depending on polarity starting at the first Sub D connector after the front end of the bus N 11 All bus terminating resistors must be switched off before measurement If a wire has been mistakenly reversed from one connector to the next a resistance value between 1 10 kOhm will be measured depending on the multimeter if measurement is conducted with the correct polarity Pin 3 is B This is the positive wire Pin 8 is A This is the negative wire gt Check co
30. ng resistor of the RS 485 Ex i fieldbus segment fitted in the fieldbus isolating repeater is supplemented with an external 470 ohm resistor Fig 5 and Fig 6 This resistor is crimped with crimp ferrules together with the wires of the fieldbus cable into the fieldbus isolating repeater A Sub D connector supplied by R STAHL with integrated switch in 120 Ohm terminating resistor is used at the end of the bus late Fig 5 external 470 Ohm resistor Fig 6 Connection of the external resistor RS 485 Ex i 470 Ohm resistor for connection to terminals 9373 21 and Order code 642 7160 9372 20 R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 4 15 Earthing of the conductive shielding of an intrinsically safe fieldbus The fieldbus construction selected by R STAHL complies with EN 60 079 14 2008 12 2 2 3 Section b This essentially relates to the option of earthing the shielding of the fieldbus at various points Excerpt from EN 60 079 14 2008 12 2 2 3 Section b If the installation is made and maintained in such a way that it can be ensured with a high degree of certainty that equipotential bonding exists between each end of the circuit i e between the hazardous and non hazardous areas then if desired cable shield
31. ng to the equipotential bonding system of the related hazardous area The equipotential bonding connection is routed to the main equipotential bonding bus of the related hazardous area R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 5 Installation 5 1 Important information on installation and project planning rules The great majority of problems that occur during commissioning of an RS 485 bus system e g Profibus DP or Modbus are installation problems such as wrong field bus cables badly connected plug and socket connectors open circuit or short circuit and missing terminating resistors or too many of them gt These faults account for about 90 of all commissioning problems gt The remaining 10 are split between configuration errors and equipment faults To counter this state of affairs attention must be paid during installation to cable laying and joining of connectors 5 2 Cable laying Keep to the bending radius gt 150 mm see manufacturer data sheet gt do not pull cables around sharp corners Keep to the allowable pulling force lt 500 N see manufacturer data sheet gt do not try to pull too long stretches in one operation Allow adequate cable to lie at the ends for making connecti
32. nnectors After working through Points 1 to 8 the fieldbus should operate correctly in 90 of all cases If not it is advisable to use corresponding measuring instruments This requires a thorough knowledge of the fieldbus and its behaviour in the event of faults and errors R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 29
33. ons Mark the cable clearly at both ends start and end identification If these basic matters are not observed the result can well be a break in a cable core or shielding These faults can sometimes occur immediately or not until weeks or months later The bus cables should be laid so that they do not lie in the immediate neighbourhood of power cables specifically frequency converters If the fieldbus cable is led into the hazardous area laying must be done according to the currently valid erection requirements EN 60 079 14 Remark If cable laying is awarded to a subcontractor the following points should be included in the contract Cable identification by the subcontractor how and where Excess cable at the ends Measurement of the loop impedance A and B A and shielding Isolation between A and B A and shielding and B and shielding Logging of the measurement results Only cables meeting the regulations should be accepted oOoahkhwonhd 5 3 Connection of the Sub D connectors and Profibus cables Neatly strip the end insulation from the Profibus cable for a safe connection of the shield and sufficient strain relief of the fieldbus cable Insert the Profibus cable into the Sub D connector at the correct point the incoming cable must be connected to the entry port of the connector and the outgoing cable must be connected to the exit port Terminating resistors if present in the connector must be swit
34. oyed The oscilloscope can show bus faults such as open circuits short circuits mismatch junctions quiescent level and transmission levels of individual fieldbus devices f a er haar ad piee w H min 1 0V TT F i Sa es gT min 0 5 V Vi acoat raed ett AA 1 00 V 1 00s Fig 11 Minimum transmission levels on the RS 485 Ex i bus in accordance with R STAHL Specification The level should be above 1 V and below 0 5 V The quiescent level is approx 0 2 to 0 3 V in the case of a correctly terminated bus The permissible signal form and notes concerning trouble shooting for the RS 485 IS are detailed in the Profibus RS 485 IS User and Installation Guideline Number 2262 Rev 1 1 dated June 2003 28 R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 7 1 Troubleshooting with simple measuring instruments procedure 1 Procurement of the bus topology documentation with positioning of the individual fieldbus devices and line lengths 2 Determining the fault behaviour occurrence of the faults sporadic gt loose contact loose wires or shielding reproducible gt ambient influences temperature humidity project planning errors cables lengths control and instrumentation syste
35. r HART and diagnostic purposes coordination between the two networks will be required for address assignment If for instance 10 fieldbus devices l S 1 Remote I O are present per Profibus network the addresses should not be set from 1 to 10 per network since the same addresses will be used on the Profibus as are used on the Servicebus The Servicebus will normally be installed beyond several Profibus segments and this means that several I S 1 stations with the same addresses occur on the Servicebus In order to avoid this the addresses should be assigned consecutively e g to 10 11 to 20 and 21 to 30 4 8 Number of fieldbus devices of an RS 485 segment 32 users may be connected per bus segment Masters slaves repeaters and isolating repeaters as well as all physical bus connections connected to the respective bus segment count as fieldbus devices 4 9 Number of fieldbus devices of an intrinsically safe RS 485 IS or RS 485 Ex i bus segment If using a RS 485 IS conform to the PNO guideline 32 fieldbus devices slaves repeaters masters etc are allowed per intrinsically safe bus segment If a fiber optic fieldbus isolating repeater type 9372 11 21 30 is used as an isolator a maximum of 5 fieldbus devices on a maximum 100 m fieldbus length are permissible If using an RS 485 Ex i bus in accordance with R STAHL specification 10 field bus devices and one field bus isolating repeater are allowed per intrinsically safe bus segment for
36. sed as the protocol In this example the 9185 11 fieldbus isolating repeater is set to RS 485 IS Unlike in Figures 2 and 3 up to 32 field bus devices are possible on the intrinsically safe bus segments in the case of an installation conform to RS 485 IS The 9185 fieldbus isolating repeater is a true repeater unlike its predecessor model 9373 21 and allows cascading of several devices see Fig 4 The number of fieldbus devices which can be connected to a network is limited by the address space of the bus protocol used see 4 7 The RS 485 interface limits the number of fieldbus devices per physical segment to 32 all devices connected to the segment such as master slaves repeaters and isolating repeaters etc count as fieldbus devices If more than 32 fieldbus devices are used in a network repeaters must be provided for further physical segments Description bus terminating resistor Ordering code Ti Sub D connector standard RS 485 non Ex and Zone 2 105715 T4 Sub D connector for Zone 1 CPM in accordance with RS 485 IS_ 94 900 02 22 0 R STAHL Schaltger te GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area Master RS 485 1 2 3 e o o o o 32 V Segment V V
37. urpose The connectors may not contain concentrated inductances or capacitances R STAHL provides the respective Sub D connectors which meets these demands R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 5 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area The following is defined for the intrinsically safe RS 485 Ex i bus in accordance with R STAHL Specification 1 The number of fieldbus devices is limited to 11 per physical segment 1 field bus isolating repeater and 10 fieldbus devices An extension of the Ex i stub line segment using a fieldbus isolating repeater is not possible A segment of the RS 485 Ex i bus is always a stub line of an RS 485 segment separated via a fieldbus isolating repeater Should more than 10 Ex i field bus devices be connected to a logical bus segment then further fieldbus isolating repeaters parallel to the RS 485 segment have to be provided The fieldbus isolating repeater always forms the start of an RS 485 Ex i bus segment The terminating resistors in an RS 485 Ex i bus segment must be connected in the fieldbus isolating repeater and at the far end of the segment The terminating resistor inside the fieldbus isolating repeater is connected internally to and 0 V via additional resistors The terminating resistor at the far end of the segm
38. us cable Type A for RS 485 This cable is available in a very wide variety of mechanical designs The cables are coloured for laying indoors laying outdoors and laying underground violet or black A light blue cable is used for intrinsically safe circuits for colour coding Cables available as standard from R STAHL Standard coded cabling Material colour R STAHL ordering code 02Y ST CY2Y 1x2x0 64 2 55 150 SW for laying outdoors PE PVC 105444 black violet 02YS ST CY2Y 1x2x0 64 2 55 150 VI for laying indoors PVC violet 105438 02YS ST CY2Y 1x2x0 64 2 55 150 BL for laying indoors PVC blue 105437 The cable supplied by R STAHL can be used for the intrinsically safe RS 485 IS or RS 485 Ex i fieldbus as well as for the standard RS 485 fieldbus 4 11 Proof of intrinsic safety of a fieldbus installation 1 RS 485 IS is conform with the PNO specification on the basis of the system certificate 2 RS 485 Exi is conform with the R STAHL specification on the basis of the system certificate 3 RS 485 IS is conform with the PNO specification on the basis of EN 60 079 11 25 R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 de Date of issue 16 04 2014 13 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 4 11 1 Proof of intrinsic safety of a fieldbus installation conform to RS 485 IS on
39. xer devices from other manufacturers repeaters or fieldbus isolating repeaters A maximum of 32 devices may be connected to an RS 485 segment Should a greater number of fieldbus devices be connected together by means of an RS 485 interface a repeater must be fitted into the line after 31 devices bus master and repeater are considered as one user or device After the repeater a further 31 users are allowed 4 2 Hazardous area Certain restrictions further to what is said above must be noted within the hazardous area 4 2 1 The following is defined for the intrinsically safe RS 485 IS bus in accordance with the PNO Guideline 1 The number of bus users has been limited to 32 per physical segment 2 A continuation of the intrinsically safe segment by means of a repeater is possible 3 The RS 485 IS is terminated on both ends with matched terminating resistors these must be approved for use in Zone 1 R STAHL supplies corresponding connectors 4 The bus structure may be similar to that in the safe area 5 The bus cable used must have an L R ratio lt 15 wH Ohm and an effective capacitance of lt 30 pF m 6 Safety related verification of the intrinsically safe bus segment can be provided on the basis of the L R calculation conform to EN 60 079 11 or using the PTB 04 ATEX 2089 1 Supplement Intrinsically safe fieldbus system type RS 485 IS or RS 485 Ex i system certificate 7 Only approved Sub D connectors can be used for this p
40. zone 1 45 version according to RS 485 IS STAHL order no 201805 b The replacement of CPM and socket has to be started at the end of the bus segment the opposite site of the DCS connection c In parallel to the CPM replacement the Sub D connector shall be replaced by Sub D connector for zone 1 CPM according to RS 485 IS STAHL order no 94 900 02 22 0 d The last Sub D connector Bus terminator will remain until the complete physical bus segment is upgraded Sub D connector for Zone 1 CPM in accordance with RS 485 Ex i 94 900 03 22 0 e After the upgrade or all component at the bus was done the last thing to do change the last Sub D connector to Sub D connector for zone 1 CPM according to RS 485 IS STAHL order no 94 900 02 22 0 and set the DIP switch PNO at the 9185 11 35 10 to ON 10 R STAHL Schaltgerate GmbH www stahl de S BA RS485 Version 2 0 en Date of issue 16 04 2014 Operating Instructions Project planning installation and commissioning of the RS 485 field bus system of R STAHL for the safe and hazardous area 4 4 Usable components Intrinsically safe RS 485 bus segment In accordance with RS485 IS In accordance with RS 485 Ex i PNO Specification R Stahl specification e Only devices in accordance with PROFIBUS e Only devices in accordance with R Stahl RS485 IS specification may be connected to specification RS 485 Ex i may be a bus segment connected to a bus segment

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