Profibus/Modbus Gateway LMP-100
Contents
1. 1211011019 8 7 6 5 16 15 14 13 b7 b6 b5 b4 b3 b2 b1 bO b7 b6 bd b4 b3 b2 b1 b byte 1 byte 2 The first byte stores the value of variables 5 to 12 and the second byte stores the value of variables 13 to 16 In the second byte bits b4 b5 b6 and b7 are set to 0 because they are unused Read Input Registers Each variable is encoded as 2 bytes using big endian byte order Read Holding As an example two analog inputs with addresses 10 and 11 and Registers values 300 and 10000 are encoded as follows LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 21 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d LMP 100 PROFIBUS MODBUS GATEWAY gt 0 AUTOMAC Write Single Register e 5G a m Write Me upie MSB LSB MSB LSB Registers byte 1 byte 2 Variable 10 Variable 11 MSB is the most significant byte LSB is the least significant byte Variable values are represented in hexadecimal notation 30040 012C 16 1000010 271046 The value to be written to the digital output is encoded in two bytes Write Single Coil To write O to the output it is necessary to transfer the value 000046 To write 1 to the output it is necessary to transfer the value FF0046 Table 3 Modbus variables encoding Page 22 of 40 LMP 100 User Manual MAN EN2. E PROCESS FIELD BUS el am m pm s n em LM D Le IS U 5 j Profibus Modbus Gateway LMP 100 DLG gt L Q S gt d Di Q User Manual Profibus Modbus Gateway MAN EN DE LMP100 01 00_14 Introduction Thank you for choosing our Profibus Modbus Gateway LMP 100 To ensure its proper and efficient usage it s important to read this manual thoroughly to understand how to operate the LMP 100 before putting it into operation About this Manual 1 This manual should be delivered to the end user of the LMP 100 2 The contents of this manual are subject to change without notice 3 All rights reserved No part of this manual may be reproduced in any form without the written permission from DLG 4 The specifications contained herein are limited to standard models and do not cover special products made by order 5 All precautions were taken on preparing this manual in order to guarantee the quality of its information CAUTION The instrument described in this technical user manual is a device suitable for application in a specialized technical area DLG supplied products are submitted to a strict quality control process However industrial control electronic equipment can cause damage to machinery or processes controlled by them in the event of any failure or improper operations and may even endanger human lives The user is responsible for setting and selecting values of the parameters of
3. Wroabus Figure 1 LMP 100 application LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 7 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d LMP 100 PROFIBUS MODBUS GATEWAY D 0 AUTOMAC Technical Specifications General Characteristics Notes Profibus DPVO and Modbus RTU both over RS 485 Galvanic Profibus 9 6k 19 2k 45 45k 93 75k 187 5k 500k 1 5M 3M 6M e 12M Modbus 1 2k 2 4k 4 8k 9 6k 19 2k 38 4k 57 6k e 115 2k 10 C a60 C Type Communication Baud rates Operating temperature Storage temperature 40 C a 70 C Relative humidity Up to 90 IP protection IP 30 DIN EN 60529 VDE 0470 Input voltage 20 4 28 8 Vdc Current consumption 90 mA Consiruction ABS plastic and flame resistant polycarbonate Placement DIN 35 mm rail DIN EN 60715 TH35 Electrical connection Cable up to 2 5mm with plug in type removable connectors Aprox weight CH N A O 101 x 22 5 x 119 5 mm height x width x depth without frontal DB9 connector Page 8 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to DLG Automa o Industrial 2011 2014 L y x M AUTOMA 0 B 0 LMP 100 PROFIBUS MODBUS GATEWAY Dimensions TT PWI X 5 p D fo r 22 50 119 50 101 119 50 Figu
4. deactivates the slave activates the slave Defines whether the Modbus slave is activated or deactivated when activation state change is triggered by bit 6 Note Activation of an active slave or deactivation of an inactive slave has no effect Table 7 Modbus slave activation control The control register is also used to trigger write rules in which the parameter Write trigger is set to User triggered As explained before in the rule configuration section a user triggered rule gives the user complete control on when the write command is sent to the Modbus network Bytes 2 to 6 of the control register are encoded in a way that each rule has a trigger bit It is important to note that the trigger bits only results in Modbus writes if the rule is configured as user triggered The other two write options Every scan cycle and On value change are not affected since they handle writing in an automatic fashion The table below details the byte encoding for write triggering The write is triggered by a rising edge in the corresponding bit i e changing its value from 0 to 1 Changing the bit value from 1 to 0 does n Byte B ot trigger writing Rule RO8 user trigger Description Rule RO7 user trigger Rule RO6 user trigger Rule RO5 user trigger Rule R04 user trigger Rule RO3 user trigger Rule RO2 user trigger Rule R01 user trigger Rule R16 user trigger
5. Rule R15 user trigger Mi OINO Po N O Rule R14 user trigger LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 29 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d LMP 100 PROFIBUS MODBUS GATEWAY gt E 4 0 z gt 0 B 0 Rule R13 user trigger Rule R12 user trigger Rule R11 user trigger Rule R10 user trigger Rule R09 user trigger Rule R24 user trigger Rule R23 user trigger Rule R22 user trigger Rule R21 user trigger Rule R20 user trigger Rule R19 user trigger Rule R18 user trigger Rule R17 user trigger Rule R32 user trigger Rule R31 user trigger Rule R30 user trigger Rule R29 user trigger Rule R28 user trigger Rule R27 user trigger Rule R26 user trigger Rule R25 user trigger Reserved Reserved Rule R38 user trigger Rule R37 user trigger Rule R36 user trigger Rule R35 user trigger Rule R34 user trigger JO GC MM OINI IOC BOO NO ON Q AOIN O IN 9 O1 Go Rule R33 user trigger Table 8 User trigger control Note bytes 7 to 15 of the control register are reserved and have no effect on the device operation If the user has no interest in using the functionality provided by the control register it can be disabled via the Control register parameter Parameter De
6. ST LED blinks twice in the minor cycle Device goes into a reboot cycle Set via the device selector switches a Profibus address between 1 and 126 Device will start operating normally after the next reboot and will be configured with a valid address Illegal state in the Profibus S SE BUNS Device is automatically rebooted going three times in the state machine into normal operation minor cycle Modbus communications ot CED Se Device is automatically rebooted going GE four times in the layer initialization error into normal operation minor cycle Insufficient number of bytes in the input or output buffers to store all data produced by the rules ST LED blinks five times in the minor cycle Device goes into a reboot cycle until the configuration is fixed properly In the compact option of the LMP 100 check if the number of bytes produced by input or output rules does not exceed 244 bytes considering that 42 input bytes are allocated if diagnostics is mapped to the input buffer and that 16 output bytes are allocated for the control register In the modular option of the LMP 100 check if the input and output buffer sizing is sufficient to store all data produced by the rules Table 6 Failure identification via the ST LED LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 27 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d LMP 1
7. command only when requested by the control register LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 19 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d D 0 AUTOMAC LMP 100 PROFIBUS MODBUS GATEWAY Choosing between the three available behaviors requires understanding of the specific application The behavior On value change is optimal from the Modbus network standpoint since data writing occurs only when the Profibus master sends a different value However this behavior is only totally safe when the variable to be written is retentive i e it holds the last value even if the Modbus slave is turned off and on again This caution is justified by the following example an output rule is configured with the behavior On value change At one point in time the Profibus master changes the value of a digital output from 0 to 1 The LMP 100 transfers this change to the appropriate Modbus slave Sub sequentially the Modbus slave is turned off and on again and the non retentive digital output goes back to value 0 In this situation the Profibus master keeps sending value 1 but as the value has not changed the LMP 100 does not detect change and does not forward the current value to the Modbus slave This situation was caused by the digital output changing from 1 to 0 when the device was turned off The User triggered behavior allows the user to control exact
8. communication channel Connections to this channel are made through terminals named positive 485 negative 485 and shield S ch MODBUS LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 33 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 DLG LMP 100 PROFIBUS MODBUS GATEWAY Mechanical Installation Fix the LMP 100 on the the top of the DIN rail Using a screwdriver pull the lock that is located at the bottom of the LMP 100 After pulling the lock fix the LMP 100 at the bottom of the DIN rail Release the lock and make sure that the LMP 100 is attached to the DIN rail Page 34 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d AU TOM AC gt 0 LMP 100 PROFIBUS MODBUS GATEWAY Recommendations It is recommended to use only appropriate tools for the LMP 100 installation and maintenance It is necessary to use a terminal type screwdriver for terminal connection or 1 8 with 3 mm maximum diameter as it is the ideal format and will not damage the connector aperture Inappropriate Recommended screwdriver screwdriver It is recommended to crimp all the wires that will be connected to the LMP 100 with a pre isolated Meede taninai daia needle type or eyelet type terminal for cables of P 0 5 1 5 mm LMP 100 User Manual MA
9. 100 User Manual MAN EN DE LMP100 01 00_14 Page 5 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d LMP 100 PROFIBUS MODBUS GATEWAY D 0 How to Specify Profibus input and output buffers sizing l compact fixed size buffers IM modular buffer sizing Page 6 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to DLG Automa o Industrial 2011 2014 L y d Xu PROFIBUS MODBUS GATEWAY Typical Applications The LMP 100 is typically used in applications where Modbus slaves need to be integrated into a Profibus DP network As an example this scenario may occur in the following situations e Replacement of a Modbus based installation with a Profibus based one reusing the Modbus devices e Necessity of using a particular device only available with Modbus communication in Profibus based facility Figure 1 depicts a LMP 100 typical application In the role of a Profibus DP slave the LMP 100 receives commands from the Profibus master These commands are interpreted by the LMP 100 which in the role of a Modbus master forwards them to the Modbus slaves Similarly the LMP 100 periodically scans the Modbus slaves for field data which are interpreted and sent to the Profibus master The mapping between Profibus and Modbus inputs and outputs is configurable through a concept called Modbus rule Profibus Master 7 AREPA fe LMP 100
10. 244 bytes In the modular option the user is allow to size the input and output buffers by inserting modules in the configuration Input rules produce and store data in the input buffer Assuming an input rule R01 for example which specifies reading of 5 Modbus registers and remembering that a Modbus register is 2 bytes long it is easy to deduce that the rule produces 10 bytes Therefore 10 bytes from the input buffer stores the value of the 5 Modbus registers read Still as another example rule R12 specifies reading of 7 Modbus digital inputs As Modbus encodes up to 8 digital inputs in a byte this rule will produce 1 byte also copied to the Profibus input buffer Besides computing the total number of bytes produced by an input rule the only question remaining is the order in which data is stored in the input buffer The LMP 100 calculates and reserves space in the input buffer according to the ascending order of the rules Therefore starting at R01 the LMP 100 checks whether R01 is an input rule If so the LMP 100 computes the number of bytes reserved to map R01 and allocates them in the beginning of the input buffer The potential input rules are allocated sequentially in the input buffer The process is repeated up to R38 The procedure is analog for output rules The computation of the byte total and evaluation order of the rules are the same Page 16 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to
11. diagnostics option the ST LED keeps indicating diagnostic conditions In addition to diagnostic conditions the ST LED is also used to indicate device failure Failures cause the device to stop operating In such cases the device automatically reboots every 10 seconds in an attempt to recover The failure is identified by the frequency with which the ST LED flashes While in failure conditions the ST LED alternates between a minor cycle in which it blinks rapidly and large cycle when it is turned off The number of times the LED blinks in the minor cycle indicates the specific failure The RUN LED turns off while the device is in failure conditions The table below shows the possible failures how to identify them and the possible recovery options LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 25 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d LMP 100 PROFIBUS MODBUS GATEWAY D 0 AUTOMAC Page 26 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d D 0 AUTOMAC Failure Memory test failure after the device is energized Identification by the ST LED ST LED blinks once in the minor cycle LMP 100 PROFIBUS MODBUS GATEWAY Recovery Device goes into a reboot cycle If the failure persists the device has a hardware defect and must be replaced Invalid Profibus address
12. the instrument The manufacturer warns of the risks of incidents with injuries to both people and goods resulting from the incorrect use of the instrument PRESENTATION 3 el 5 HOW EE 6 TYPICAL APPLICATIONS 22 u 7 TECHNICAL SPEEIEICATIONS 22a ege eege 8 General Characteristics a a ee ee ee 8 UNE 9 FRONTAL EE 10 CONFIGURATION ME 11 Profibus address CONNQUEANO Nissa ESTA RD 11 GSD e installati EE 12 Module configuration LMP 100 M 2 22 ee a lebe 12 Modbus network Configuration arena 13 Modbus rule configuration energie 16 Ke we EE 23 ORION OCIS EE EE 28 ELECTRICAL INSTALLATION 2 2 32 Power UI OO hee 33 Pronbus DP CommuniCallonss EE 33 Modbus RT USC OMMAUMICATIONS E 33 MECHANICAL INSTALLATION ss sssssss esse esse sees eenn eenn eenn eenn eenn 34 RECOMMENDATIONS een 35 WARBANTY s aaa 36 L y d Xu PROFIBUS MODBUS GATEWAY Presentation The LMP 100 is a gateway that enables the integration of the Profibus and Modbus industrial networks By assuming simultaneously the role of a Profibus DP slave and a Modbus RTU master it allows Modbus slaves to be controlled by Profibus masters The LMP 100 may be mounted on a standard 35 mm DIN rail LEDs provide indication of power supply device Modbus and Profibus network states The power and communication cables are connected by fully detachable terminal blocks The connection to the Profibus network can also be made through a DB9 connector on the frontal LMP
13. 00 PROFIBUS MODBUS GATEWAY D 0 AUTOMAC Control register The LMP 100 provides the user with a data area called control register where several settings can be performed on the device The control register is located at the start of the Profibus output buffer occupying the first 16 bytes Therefore to calculate the location of data consumed by the write rules it must be considered that data is arranged immediately after the control register after byte 16 The control register contents are shown below byte 0 byte 1 bytes 2 6 bytes 7 15 Slave address Slave activation control Write triggers Reserved Bytes 0 and 1 of the control register allow controlling the activation of Modbus slaves Activation means the possibility of stopping and reestablishing communications with a Modbus slave while the LMP 100 is operating without the need for Modbus rule reconfiguration As explained before in the rule configuration section each rule has a parameter called Enabled with the purpose of avoiding that a the rule produces activity in the Modbus network This parameter is interesting in situations such as failure or removal of a Modbus slave which cause network timeouts due to rules that address the referred slave The Enabled parameter can be set to value No in all rules that address the missing or defective Modbus slave preventing Modbus communications with the slave However it is important to empha
14. DE LMP100 01 00 14 All rights reserved to DLG Automa o Industrial O 2011 2014 L y b d AU TOM AGC D 0 Diagnostics LMP 100 PROFIBUS MODBUS GATEWAY The LMP 100 provides diagnostic information describing in detail its operation status The diagnostic information is encoded in 42 bytes as shown below byte 0 bytes 1 and 2 byte 3 byte 4 byte 41 Diagnostic byte count Reserved Operation Rule R01 diagnostics Rule R38 diagnostics diagnostics Diagnostic is comprised of several conditions mapped into bits where bits with value 1 indicate an alarmed condition Byte 0 indicates the number of available diagnostic bytes The LMP 100 provides 42 diagnostic bytes Bytes 1 and 2 are reserved Byte 3 contains the Modbus rules overall diagnostics encoded as shown in table 5 Condition Description Comments Q Reserved 1 Reserved 2 Reserved 3 Reserved 4 Reserved The LMP 100 remains While processing the an Sande e Exception in Modbus Modbus rules at least one Ge e 5 which slaves produced response slave returned a response the exception by with an exception l 3 checking the rule specific diagnostics While processing the The LMP 100 remains Modbus rules at least one in operation It is Timeoutinihedbus slave did not return a possible to check 6 response response within the time which slaves produced period specified by the the exceptio
15. DLG Automa o Industrial 2011 2014 L y b d D 0 AUTOMAC LMP 100 PROFIBUS MODBUS GATEWAY A Modbus rule is configured through the following parameters Parameter Description Modbus function code Modbus function used to read or write Modbus variables Determines whether the rule is an input or output rule e None the rule is not executed and does not reserve space in the Profibus buffers e Read Coils allows reading of one or more digital outputs coil The rule becomes an input rule e Read Discrete Inputs allows reading of one or more digital inputs The rule becomes an output rule Read Holding Registers allows reading of one or more analog outputs The rule becomes an output rule s Read Input Registers allows reading of one or more analog inputs The rule becomes an input rule e Write Single Coil allows writing of one digital output The rule becomes an output rule e Write Single Register allows writing of one analog output The rule becomes an output rule e Write Multiple Coils allows writing of one or more digital outputs The rule becomes an output rule s Write Multiple Registers allows writing of one or more analog outputs The rule becomes an output rule Modbus slave address Modbus slave addressed by the rule Slaves in the range from 1 to 247 can be addressed Start address Number of variables Together these two parameters indicate which Modbus
16. N EN DE LMP100 01 00_14 Page 35 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d LMP 100 PROFIBUS MODBUS GATEWAY D 0 AUTOMAC Warranty The manufacturer assures to the equipment owners identified by the purchase invoice warranty of 1 one year as follows 1 The warranty period begins on the data of the invoice issue 2 Within the warranty period the labor and parts used for repairing damage occurred in normal use are free 3 For repairs send the equipment along with the shipping invoices to our factory in Sertaozinho Sao Paulo state Brazil DLG s address is available at the end of this manual 4 The owner is responsible for transportation costs and risks 5 Warranty will be automatically suspended if changed are made to the equipment by personnel not authorized by DLG defects caused by mechanical shock exposure to conditions unfit for use or tampering with the product 6 DLG disclaims any charge relating to unauthorized repairs or replacements due to failures caused by agents external to the equipment the improper use of them and as a result of unforeseeable circumstances or major forces 7 DLG ensures full operation of the equipment described herein and all existing operations Page 36 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to DLG Automa o Industrial 2011 2014 A U TOM A CG gt Q DILG Automa o I
17. ame diagnostic data for both mechanisms The choice of mechanism for accessing diagnostic data must take into account certain factors The Profibus input option lets diagnostic data to be accessed easily since they are mapped to the Profibus input buffer However as they are mapped to the the input buffer they take space in the buffer reducing the number of Modbus input variables that can be mapped through the rules The Profibus extended diagnostics option does not make use of the input buffer to send diagnostic data taking advantage of the Profibus extended diagnostics functionality Thus the entire input buffer can be used to access Modbus input variables However the Profibus master configuration required to access the extended diagnostic data is usually more difficult than the configuration to access data from the input buffer In addition some Profibus masters simply do not allow the user to access extended diagnostics Looking at the factors mentioned above the decision on which diagnostics mechanism to be chosen is weighted by the effort required to access the data the possibility of reserving part of the input buffer for diagnostic data and also by the extended diagnostic data access in the chosen Profibus master The ST Status LED is lit when at least one diagnostic condition is alarmed When all conditions return to normal the ST LED turns off Even if the user chooses not to access diagnostic data through the No
18. ed rule keeps its space reserved in the Profibus buffers Thus the relative position of data in the buffers for each rule is unchanged avoiding reconfigurations in the Profibus master data access A rule can also be disabled by changing the parameter Modbus function code to None However this option is NOT recommended because it changes the relative position of data in the Profibus buffers Thus the Profibus master will have to be reconfigured to readjust data access in the buffers Table 2 Modbus rule parameterization It is important to know how the Modbus functions encode the data exchanged between masters and slaves since the LMP 100 transfers to the Profibus buffers Modbus data exactly as they are exchanged in the Modbus network Table 3 details how data is encoded according to each Modbus function Modbus function Encoding Each variable is encoded as 1 bit Data is always transferred in multiples of 1 byte The least significant bit of the first byte contains the variable address by the parameter Start address The following variables will be encoded toward the most significant bit When 8 variables fill the byte a new byte is allocated keeping the encoding from the least to the most significant bit When there are unused bits in a byte the bit is set to 0 Read Coils Read Discrete Inputs As an example the digital input variables 5 to 16 are encoded as Write Multiple Coils shown below
19. es transferred in the Profibus input and output buffers The GSD file defines input and output modules of several sizes which are handled by users in the Profibus master configuration tool The following modules are available 1 word input 2 words input 4 words input 8 words input 16 words input 1 word output 2 words output 4 words output 8 words output 16 words output 1 word 2 bytes Modules must be allocated so that the Profibus input and output buffers have enough space to store data produced by the Modbus rules The Modbus rule concept and how to calculate the amount of data produced by them are described in the Modbus rule configuration section Page 12 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d PROFIBUS MODBUS GATEWAY Modbus network configuration The LMP 100 provides the following configuration parameters for the Modbus network Parameter Description Modbus network baud rate All slaves must use the baud rate adopted by the LMP 100 The possible values are e 1200 bps e 2400 bps e 4800 bps e 9600 bps e 19200 bps e 38400 bps e 57600 bps e 115200 bps Used as a mechanism to detect data transmission errors All slaves must use the parity adopted by the LMP 100 For firmware versions up to 02 00 00 possible values are e Even s Odd e None Modbus baud rate Starting from f
20. ess is simplified by eliminating the use of additional tools The only parameter that is not configurable through the master is the LMP 100 address on the Profibus network It is important to notice that as all configuration is sent to the LMP 100 at the Profibus DP parameterization state configuration changes cause the device to leave the data exchange state and return to the parameterization state temporarily stopping the data transfer between the Profibus and Modbus networks Note Whenever functionality of bits grouped into one byte is described consider bit O as the least significant bit and bit 7 as the most significant bit Profibus address configuration The configuration of the LMP 100 Profibus address is accomplished through the selector switches located on the side of the device labeled PROFIBUS ADDRESS There are seven selector switches which enable the encoding of a binary number between 0 and 127 representing the device Profibus address The device must be assigned an address between 1 and 126 as addresses 0 and 127 are reserved The selector switches are numbered from 1 to 7 Switch 1 is the address least significant bit and switch 7 is most significant one As an example to assign address 23 to the device simply convert decimal number 23 into a 7 bit binary number 2310 00101112 As the most significant bit is represented by switch number 7 the selector switches would have to be configured as Switch 1 g
21. ion signals it is recommended to use woven shielded cables and the woven grounding must be done on the S terminal and other ground references located at the bus extremities Page 32 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00 14 All rights reserved to DLG Automa o Industrial O 2011 2014 L y b d PROFIBUS MODBUS GATEWAY Power Supply The LMP 100 must be powered through the e terminals with voltage in S the range from 20 4 to 28 8 Vdc The GND terminal is used to ground the mass to the panel It is recommended to use 1 5mm cables to the and terminals and 2 5mm cables to the ground The wiring diagram is described in the picture Profibus DP Communications PROFIBUS The LMP 100 provides a Profibus DP over RS 485 serial communication channel Connections to this channel are made through u a terminals named positive B negative A and shield S Connection to the Profibus DP channel can also be made through n the DB9 connector available on the LMP 100 The connection must be made using standard Profibus DP connectors The DB9 connector and the terminals are internally wired and can be used together For example the LMP 100 may be connected to the Profibus master through the terminals and a network analyzer can be simultaneously connected to the DB9 connector without disturbing the device operation Modbus RTU Communications The LMP 100 provides a Modbus RTU over RS 485 serial 7
22. iple Coils Read Holding Registers Read Input Registers 1 lt ns122 n 2 Write Multiple Registers Write Single Coil Write Single Register Parameter is not used 2 Since the maximum value of the Start address parameter is 65535 to access variable 65536 a rule with Start address less than or equal to 65535 and Number of variables large enough to address variable 65536 must be created As examples Addressed variables 65535 65536 65530 65531 65532 65533 65534 65535 65536 Start Address Number of variables 65535 2 65530 7 Byte swap available starting at firmware version 02 01 00 Defines whether the input Input Registers or output Holding Registers byte order should be inverted e No byte order is not inverted e Yes byte order is inverted Page 18 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d D 0 AUTOMAC LMP 100 PROFIBUS MODBUS GATEWAY On variables that require more than 1 byte of storage the definition of the byte order is essential for the correct processing of the variable There are two possible byte orders considering that a Modbus analog variable is 2 bytes long e Little endian LE also known as Intel format e Big endian BE also known as Motorola format The LE order dictates that the variable s least significant byte mus
23. irmware version 02 01 00 possible values are e Even Modbus parity e Odd s None with 1 stop bit s None with 2 stop bits The possibility of choosing the number of stop bits is aimed at increasing interoperability with the widest possible range of Modbus slaves The Modbus specification states that 2 stop bits per character shall be used when parity is not used However there are countless slaves on the market that operate with only 1 stop bit Period in milliseconds of the scanning cycle used to poll data from Modbus slaves Allowed values lie in the range Modbus scan time ms from 0 to 60000 ms The scanning cycle period is defined as the minimum time LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 13 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d gt 0 AUTOMAC LMP 100 PROFIBUS MODBUS GATEWAY between the start of consecutive Modbus scanning cycles For example assuming a period of 5000 ms the device ensures that the next scan cycle will start at least 5000 ms after the current scan cycle Value O indicates that the next scan cycle should begin immediately after the end of the current scan cycle Factors such as number of variables timeouts and retransmissions can cause the total time taken to scan all variables to be greater than the configured scan cycle period In this case the next scan cycle start immediately after the end of the current sca
24. ly at which time writing is made The control register allows the user to trigger each output rule individually writing the value available in the Profibus output buffer Therefore output rules with the User triggered behavior need the value to be written copied to the Profibus output buffer and the trigger fired in the control register The writes triggered by the LMP 100 always carry all the variables addressed by the rule An output rule addressing for instance five Modbus variables configured with behavior On value change and that at a given time detects the change of only one of the five variables will result in a Modbus write command containing the new value of the variable that has changed and the last value of the other variables Enabled Sets whether the rule is enabled or disabled A disabled rule does not produce activity in the Modbus network e Yes the rule is enabled e No the rule is disabled In some cases it may be interesting to disable a rule For example a defective Modbus slave can cause considerable Page 20 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d PROFIBUS MODBUS GATEWAY delays in the LMP 100 scanning cycle due to communication timeouts In this case it is suggested to disable the rules that address the faulty slave Even not producing activity in the Modbus network a disabl
25. n by Modbus response timeout checking the rule parameter specific diagnostics While processing the The LMP 100 remains 7 Error in Modbus response Modbus rules at least one in operation It is slave returned a response possible to check LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 23 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d LMP 100 PROFIBUS MODBUS GATEWAY D 0 AUTOMAC with an error Errors may be parity errors incomplete responses among others which slaves produced the exception by checking the rule specific diagnostics Table 4 Operation diagnostics Bytes 4 to 41 contain detailed diagnostics of Modbus rules R01 to R38 respectively Information is encoded as shown below Condition Comments Description O Reserved The LMP 100 remains in operation The rule While processing the rule MIDE DIOCB Sc Exception in Modbus the next cycle and the 1 the slave returned a S Se response with an exception dlagnesile condition remains active while the slave responds with an exception The LMP 100 remains While processing the rule in operation New the slave did not return a transmission attempts 2 Timeout in Modbus response within the time will be made and the response period specified by the diagnostic condition 4 41 Modbus response timeout remains active while
26. n cycle Modbus response timeout ms Maximum time in milliseconds that the LMP 100 waits to receive a response from a Modbus slave If the slave does not respond within this time the LMP 100 considers it as a failure and resends the command Allowed values lie in the range from 10 to 60000 ms Modbus retries Number of retransmission attempts of a command Retransmissions occur when the slave does not respond or when the slave sends an incorrect response Allowed values lie in the range from 0 to 5 Value O indicates no retries Modbus interframe silence Time waited by the LMP 100 to send a new command after receiving a response from a Modbus slave The possible values are e U mS e 10 ms e 100 ms e 500 ms e 1000 ms The wait interval is useful to allow the slave which sent the response to be able to change the RS 485 transceiver direction from transmit to receive The LMP 100 is configured by default to wait for 10 ms a suitable value for most installations Therefore change this parameter only when really necessary Table 1 Modbus network parameterization Page 14 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to DLG Automa o Industrial 2011 2014 L y d Xu PROFIBUS MODBUS GATEWAY Note Except for the Modbus parity all the parameters listed above have a direct influence on the time interval needed by the LMP 100 to scan all M
27. ndustrial Ltda Rua Jos Batista Soares 53 Distrito Industrial 14176 119 Sert ozinho S o Paulo Brasil Fone 55 16 3513 7400 www dlg com br MAN EN DE LMP100 GATEWAY PROFIBUS MODBUS 01 00_14 LMP 100 DLG reserves the right to change this manual contents without notice in order to keep it updated with future product improvements
28. odbus slaves LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 15 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d PROFIBUS MODBUS GATEWAY Modbus rule configuration The LMP 100 defines a concept named Modbus rule Modbus rules define how to access Modbus variables that will be transferred to the Profibus network A rule allows the definition of which Modbus variables should be mapped A rule is classified as input rule or output rule Input rules allow Modbus variables to be read and sent to the Profibus master Output rules allow Modbus variables to be written with data sent by the Profibus master The LMP 100 provides 38 Modbus rules freely distributed between input and output rules according to the necessity Rules are numbered R01 R02 up to R32 or 38 in the compact version It is essential to understand how Modbus rules are related to the Profibus buffers in order to operate the device correctly The LMP 100 has two buffers named input buffer and output buffer each 244 bytes long used for data exchange with the Profibus master The input buffer is where the LMP 100 puts data to be transferred to the Profibus master This data is polled from the Modbus slaves The output buffer is where the LMP 100 places data received from the Profibus master This data will be transferred to the Modbus slaves In the LMP 100 compact option input and output buffers have a fixed length of
29. parameter the slave does not respond The LMP 100 remains While processing the rule in operation The rule the slave returned a will be processed in 3 Error in Modbus response with an error the next cycle and the response Errors may be parity errors diagnostic condition incomplete responses remains active while among others the slave responds with an error 4 Reserved 5 Reserved 6 Reserved 7 Reserved Table 5 Modbus rule diagnostics Diagnostic data can be obtained through two mechanisms The choice of mechanism is done via the Device diagnostics parameter The options are Page 24 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d PROFIBUS MODBUS GATEWAY Diagnostic data is transferred to the start of the Profibus input buffer Thus the Profibus master accesses diagnostic Profibus input data in the same way that it accesses Modbus input data The Modbus input data produced by the Modbus rules are placed right after the diagnostic data Profibus extended Diagnostic data is transferred to the Profibus master via a diagnostics Profibus protocol functionality named extended diagnostics No diagnostics None of the previous mechanisms is used Thus there is no way the user can get diagnostic data available starting at firmware version 02 01 00 The LMP 100 provides exactly the s
30. re 2 Dimensioning for assembling dimensions in millimeters LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 9 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 DLG LMP 100 PROFIBUS MODBUS GATEWAY Frontal LED Color Description Power Indicates power supply operation Continuously lit LED indicates power supply operation Run Indicates proper operation of the device After the device is energized the LED will flash 5 times If the self test boot routines succeed the LED remains lit indicating proper operation of the device If the LED is turned off a critical error occurred at startup and in this case the device will no longer operate correctly Bus Fail Indicates failure in the Profibus network When lit means that the LMP 100 is not in the Data Exchange state Status Indicates presence of failure or diagnostics The failure is indicated by the frequency at which the LED flashes When lit continuously indicates the presence of diagnostic information Indicates data transmission over the Modbus network Indicates data reception over the Modbus network Page 10 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to DLG Automa o Industrial 2011 2014 L y d Xu PROFIBUS MODBUS GATEWAY Configuration The LMP 100 was designed so that its entire configuration is obtained through the Profibus master Thus the configuration proc
31. scription Control register Disables the control register functionality and do not reserve memory for it at the Profibus output buffer available starting at firmware version 02 01 00 Page 30 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to DLG Automa o Industrial 2011 2014 L y d E AU TOM AGC LMP 100 PROFIBUS MODBUS GATEWAY It is important to be aware that by disabling the control register the user is no longer able to control the runtime activation of slaves and it becomes impossible to trigger user triggered write rules It is also important to note that the output buffer becomes fully available for Profibus output variables since the control register is no longer mapped at the beginning of the output buffer D 0 LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 31 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d AU TOM AC gt 0 LMP 100 PROFIBUS MODBUS GATEWAY Electrical Installation a D a wo D o ES S ECH POWER MODBUS bina L EREEEEEI s ct T T y T T T T T y T T T y T T T T T T T T T T T i 7 E PROFIBUS ol lt m L S amp S Figure 3 LMP 100 electrical connections Attention all cables must be crimped with eyelet terminals for cables up to 1 5 mm unless otherwise stated For the interconnection of communicat
32. size again that any change in the LMP 100 parameters stops data exchange while the the device is reparameterized by the Profibus master The activation control in the control register is an option for situations where it is interesting to the interrupt communications with a Modbus slave without reparameterization of the LMP 100 The LMP 100 treats as disabled the Modbus rules that address a deactivated Modbus slave The rules remain disabled until slave reactivation is requested in the control register or until the equipment is reparameterized When reparameterized the rule enabled state is a function solely of its Enabled parameter value Byte 0 must be set with the address of the Modbus slave that will have its activation state changed Byte 1 allows choosing if the slave will be activated or deactivated and also trigger the activation change The byte encoding is shown below Page 28 of 40 LMP 100 User Manual MAN EN DE LMP100 01 00_14 All rights reserved to DLG Automa o Industrial 2011 2014 L Bit Function Reserved d LMP 100 PROFIBUS MODBUS GATEWAY Description Reserved Reserved Reserved Reserved PM O Reserved A rising edge on the bit value triggers the activation state change of the Trigger Modbus slave referred in byte 0 i e the bit value must be changed from 0 to 1 Changing it from 1 to 0 does not trigger the activation change 0 7 Activation 4
33. t ON Switch 2 gt ON Switch 3 gt ON Switch 4 gt OFF Switch 5 gt ON Switch 6 gt OFF Switch 7 gt OFF LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 11 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d PROFIBUS MODBUS GATEWAY The device reads the position of the selector switches immediately after being energized The assigned address is kept constant during device operation even if the position of the selector switches is changed Therefore to change the device s Profibus address it is necessary to change the position of the selector switches to encode the new address turn off and re energize the device GSD file installation The GSD General Station Description file supplied with the LMP 100 details all the features and characteristics of the device The file must be installed within the Profibus master configuration software The GSD file installation procedure is manufacturer specific so it is recommended to consult the respective Profibus master user manual After proper installation of the GSD file the entire configuration of the LMP 100 is done through the Profibus master configuration software For the compact version of the device use the DLG_OD8A gsd file For the modular version of the equipment M use the DLG_OE6C gsd file Module configuration LMP 100 M The LMP 100 modular option gives the user the power to size appropriately the number of byt
34. t be stored in the memory address right before the memory address of the most significant byte In BE order the byte positions are inverted Equipments with Modbus communications shall encode their analog variables in the BE format Therefore the analog data acquired by the LMP 100 is encoded in this format Profibus masters and other supervisory systems may be designed to operate in the LE format Should that be the case the LMP 100 may be configured to perform the byte order inversion internally thus eliminating the need to program a byte order inversion algorithm in the PLC for instance When configured to perform the byte order inversion the LMP 100 inverts the input variables before copying them to the Profibus input buffer as well as the ouput variables before sending them to the proper Modbus slave It is worth noting that the LMP 100 inverts all variables of a rule configure to acquire more than one variable Write trigger Defines the behavior of output rules This parameter is ignored when the rule is an input rule e Every scan cycle output rules produce an automatic Modbus write command on each scan cycle The written value is the last value received from the Profibus master e On value change output rules produce an automatic Modbus write command only when the value sent by the Profibus master is different from the last value written to Modbus slave e User triggered output rules produce a Modbus write
35. variables are addressed by the rule The variables of one rule must be accessed contiguously For example one rule is able to read analog inputs with addresses 1 to 10 If it is necessary to read analog inputs 1 to 10 and 15 to 20 at least two rules are required According to the Modbus specification each data type digital input digital output analog input and analog output can have up to 65536 variables LMP 100 User Manual MAN EN DE LMP100 01 00_14 Page 17 of 40 All rights reserved to DLG Automa o Industrial 2011 2014 L y b d D 0 AUTOMAC LMP 100 PROFIBUS MODBUS GATEWAY The Start Address parameter determines the start address of the range of variables The parameter Number of variables indicates how many variables will be accessed starting from the initial address The Start address parameter accepts values in the range from 1 to 65535 The Number of variables in conjunction with the Modbus function selected in the Modbus function code parameter determines the byte count allocated in the Profibus buffers for the rule Moreover the range of allowed values for the Number of variables parameter depends on the type of variables accessed The table below details the mentioned dependencies Modbus function Number of variables ees a aD n reserved Read Coils Read Discrete Inputs 1 lt n lt 1952 n 1 8 1 Write Mult
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