DL3500-DH+/MODBUS COMMUNICATION CONTROLLER APPLICATION NOTE

Transcription

1 L35-H+/MOBUS COMMUNICATION CONTROLLER APPLICATION NOTE This application note contains information on the L35- to H+ interface. The L35 model contains two modes of operation, Master and Slave, which are selectable by the PC Configuration Software. The latest version is available on the web at The information contained in this application note is supplementary information specific to not contained in the regular User's Guide. Master or Slave mode? This application note is divided into two parts, Master and Slave modes; they correspond to the mode the L35 is going to be on the Network, and which side either H+ or the commands will be initiated on. Master mode is used when a device on the H+ network is going to initiate all communications with one or many slave devices. Please Refer to L35-H+/ Master Application note. Slave mode is used when a device on the network is going to initiate all communications with one or many SLC s, PLC s or other H+ devices. Please Refer to L35-H+/ Slave Application note. The application notes generally assume that a SLC or other H+ device which can originate commands to via a L35 in master mode, or responding to commands via a L35 in slave mode. Only devices capable of transmitting H+ message commands in PLC5 (or PLC3) format and able to receive H+ message commands in PLC5 format can be used with the L35-/H+ including SLC s, MicroLogix s, ControlLogix s and HMIs as well as other intelligent devices. ue to differences between H+ and protocols and the universal design of the L35 there are differences between the lengths of messages, error handling and addressing which have to be carefully considered by the Systems esigner, Programmer and Installer. CAUTION: Incorrect configuration may result in unsafe operation, damage to equipment or safety hazard to personnel. the L35 User's Guide and the appropriate application notes carefully before putting a L35 on-line. The hardware and software must be fully tested off-line in a safe TEST environment prior to putting the unit on-line in an operational environment. L35-H+ MOBUS MASTER TO A-B H+ CONFIGURATION Use this option when the L35 is required to be the master on a network. The Master Application notes contain configuration information for the L35-H+ protocol and should be used in conjunction with the L35 User's Guide. L35-H+ MOBUS SLAVE TO A-B H+ CONFIGURATION Use this protocol when the L35 is required to be a slave device on a network. The Master Application notes contain configuration information for the L35-H+ protocol and should be used in conjunction with the L35 User's Guide. # Byrne R, Burnaby, BC, V5J3J, Canada Phone: or

2 NOTES:. The unit that you have received can be configured as Master or Slave. Ensure that you understand and carefully follow the specific configuration procedures for the protocol. 2. There are significant differences between the configuration, programming and operational requirements of the Master and Slave protocols. 3. If you configure the L35 for Master Operation it must be the only master on the network. A station on H+ originates commands to the L35-H+ Master that then re-transmits them over to a Slave device. Other intelligent H+ devices capable of initiating H+ messages in PLC5 (or PLC3) format and able to receive PLC5 message commands could also be used as the H+ master.. Be sure to fully test the hardware and software off-line to ensure that you understand its configuration and operation. Prior to putting the L35 on-line in an production process, the operation of the complete system should be fully tested on-line in a safe "test" environment. 5. ue to differences between H+ and hardware and software, there are differences between the lengths of messages, error handling and addressing which have to be carefully considered by the Systems esigner, Programmer and Installer. 6. Additional literature regarding H+, and PLC products can be obtained from Modicon and A-B. Suggested reference materials for A-B H+ protocol is shown in section.7 of the User's Guide. CAUTION: Incorrect configuration may result in unsafe operation, damage to equipment or safety hazard to personnel. the L35 User's Guide and the appropriate application notes carefully before putting a L35 on-line. The L35 hardware and software must be fully tested off-line in a safe TEST environment prior to putting the unit on-line in an operational environment. Contact Technical Support if you need further information or assistance. TECHNICAL SUPPORT Tel : (6) Or info@equustek.com The following table provides a reference between the different radixes used for your reference ECIMAL TO OCTAL TO HEXAECIMAL ARESS CONVERSION TABLE EC OCT HEX EC OCT HEX EC OCT HEX EC OCT HEX A A A A 3 B B B B 2 C 28 3 C 5 2C 6 7 3C E 3 36 E E E 5 7 F 3 37 F F F # Byrne R, Burnaby, BC, V5J3J, Canada Phone: or

3 APPLICATION NOTE L35-/H+ - MASTER PROTOCOL The information contained in this application note is for the Master protocol only, and is supplementary to the information in the User's Guide. To use the L35 in Slave Mode follow the procedures in the Slave application notes. There are significant differences between the configuration, programming and operational requirements of Master and Slave protocols. INEX FOR MOBUS MASTER MOE. GENERAL. ARESS MAPPING BETWEEN A-B AN MOBUS.. ESTINATION ATA TABLE ARESS FORMAT 3.2. H+ MESSAGE COMMANS.2.2 MOBUS COMMANS.2.3 PLC-3 WOR RANGE COMMANS (PLC-3 s and 5 s).2.3. MOBUS IAGNOSTICS COMMANS 5.2. PLC-5 TYPE R/W & WOR RANGE R/W (PLC-5 s and SLC s) PLC5 TYPE COMMANS USING NXYY:Z ECOE PLC5 TYPE COMMANS USING NXYZ:Z ECOE PLC5 TYPE COMMANS USING NYXZ:Z ECOE MOBUS IAGNOSTIC COMMANS BROACAST COMMAN 7.3 H+ MESSAGE COMMAN 8.3. A-B TO MOBUS EXAMPLES.3.. PLC-3 WOR RANGE COMMANS.3..2 PLC-5 TYPE COMMANS (NXYY:Z).3..3 PLC-5 TYPE COMMANS (NXYZ:Z).3.. PLC-5 TYPE COMMANS (NYXZ:Z). COMMUNICATIONS SEQUENCE.5 MOBUS MESSAGE ATA LENGTH CONSIERATIONS.6 MOBUS MASTER USING BM85 MOBUS PLUS / MOBUS BRIGE MUX _.7 H+ AN MOBUS - GENERAL 2. MOBUS MASTER NETWORK APPLICATIONS MASTER TO MOBUS SLAVE NETWORK MASTER TO MOBUS PLUS VIA BM85 MOBUS BRIGE 2 # Byrne R, Burnaby, BC, V5J3J, Canada Phone: or

4 . GENERAL The L35 can be configured as a network "Master". In this mode it enables SLC s and other devices on a H+ network to initiate various commands to read and write coils, inputs and registers of slave devices on a network. The interface can be set for RS232 or RS22/RS85. Typical H+ stations that can communicate with via the L35 include devices such as PLC3s, PLC5s, SLC5/s, PCs, HMIs and other intelligent OEM devices. (Now referred to as PLC s in this document) Communication between and the L35 must be initiated from a H+ PLC. The L35 must be the only Master on the network and does not require a address. The L35 is an active station on H+ and requires a unique H+ station address number. The L35 can accept PLC3 Word Range / or PLC5 Typed / message commands from any station on the H+ network. The estination ata Table Address or TAG is normally used to address a specific File and Word in another PLC on the network. This address is interpreted by the L35 in a specific way and permits data to be mapped from a PLC and a slave device. This allows the PLC programmer to directly address a specific register in a slave device without any previous configuration being necessary in the L35.. ARESS MAPPING BETWEEN A-B AN MOBUS The design of the L35 Master and the PLC message command structure allows the L35 to use the contents of the estination ata Table Address in the PLC for direct address mapping to. The L35 decodes the estination T Address to access to various Slave stations, commands and addresses. The actual station number and addresses ranges that can be accessed depends on the PLC type, H+ message type and Programming software used. In the configuration software the type of PLC used is selected. See below. Parameters-L32 V3. estination (Target) ata Table Address ecoding Options for Allan-Bradley PLC5 Type commands (Used by SLC s and PLC s): PLC s and SLC s - (NXYY:Z) Use this format if the SLC, PLC, or other device allows up to : to be entered for the file:word. X Registers or Coils =, = X, 3 = 3X, = YY Slave address to Z Register address to Example: N:336 will access register 336 from Slave address.

5 SLC s - (NXYZ:Z) Use this format if the SLC, PLC, or other device allows up to : to be entered for the file:word. X Registers or Coils =, = X, 3 = 3X, = Y Slave address to Z:Z Register address Z before the colon : Thousands digit to Z after the colon : Ones to Hundreds digits to Example: N3:36 will access register 336 from Slave address. NOTE: Z:Z cannot equal :. The minimum value for Z:Z is :. MicroLogix s and SLC s - (NYXZ:Z) Use this format if the SLC, PLC, or other device allows up to 255:255 to be entered for the file:word. Y Slave address = slave address, = slave address 2, 2 = slave address 3 X Registers or Coils =, = X, 3 = 3X, = Z:Z Register address Z before the colon : Thousands digit to Z after the colon : Ones to Hundreds digits to 255 Example: N3:36 will access register 336 from Slave address. NOTES:. Z:Z cannot equal :. The minimum value for Z:Z is :. 2. Slave address 3 cannot access registers or coils above For more information about using PLC-5 Typed s with the decoding formats shown above, refer to section.2. of this manual. 2

6 .. ESTINATION ATA TABLE ARESS FORMAT If a PLC is being used to generate messages for the L35 to convert and send to a network, values are entered into the estination ata Table Address of the PLC s H+ Message in the format below. MMI s and other applications would have a similar destination address structure for reading and writing data to and from a PLC (refer to your OEM application documentation). When a PLC is communicating with other devices over the H+ network, the destination data table address (TA) has different meanings depending on whether it is communicating with another PLC or if it is communicating with a L35 Master. Below are descriptions of the different meanings for the TA. The usual format of the destination data table address (TA) is: T, F, and e are explained below. T F : e Communicating with another PLC on the H+ network T = File Type (O = output, I = input, B = binary, N = integer, etc.) F = File Number ( - 63, -255, -, or - ) * e = Word Number ( - 255, - or ) * Communicating with a L35 Master on the H+ network using PLC-3 commands ata and Control Functions T = (B, N, S, F) F = Slave Address ( - 255) e = Coil/Register ( - ) iagnostic Functions (xyyy:zzzz) T = () F = Sub-function / Slave Address (xyyy) e = Sub-function / ata (zzzz) For more details about mapping the data and control functions and the diagnostic functions using PLC-3 commands, see section.2.3 Communicating with a L35 Master on the H+ network using PLC-5 commands ata and Control Functions (includes iagnostic Function) T = Not used ** F = PLC-5 ecoding Format (NXYY:Z, NXYZ:Z, or NYXZ:Z Format) e = PLC-5 ecoding Format (NXYY:Z, NXYZ:Z, or NYXZ:Z Format) For more details about mapping the data and control functions and the diagnostic functions using PLC-5 commands, see sections. and.2. * ** epends on PLC type. To avoid errors when downloading your program to the PLC, a file type is needed so that a legal format for the TA is used. 3

7 .2 H+ AN MOBUS COMMANS.2. H+ MESSAGE COMMANS The L35-H+ set to Master Mode can generate protocol functions on receipt of the following H+ message commands: PLC-3 Word Range or Word Range s PLC-5 Typed or Typed s PLC-5 Word Range and s A-B PLCs can generate the following commands: SLC s PLC-5 Typed / s PLC-3 PLC-3 Word Range / s PLC-5 PLC-3 Word Range / s and PLC-5 Typed / s.2.2 MOBUS COMMANS The commands and addresses that can be generated depend on the specific H+ message command received. The L35-H+ in Master Mode is designed to work with H+ message commands including PLC-5 Typed and and PLC-3 Word Range and. Use the PLC-3 Word Range and commands whenever possible because the larger address field of these commands provides the additional flexibility necessary to generate the full range of commands and addresses..2.3 PLC-3 WOR RANGE COMMANS (PLC-3 s and 5 s) MOBUS ATA AN CONTROL COMMANS USING PLC-3 WOR RANGE REA / WRITE COMMANS On receiving a PLC-3 Word Range or Word Range Message (MC) a L35 Master decodes the command s estination ata Table Address (TA) File type (character). Then, dependent on whether the H+ message is a read or a write it can generate the appropriate command as shown in the table below. The following TA format is used for mapping PLC-3 Word Range / commands to commands: x y : z Where x = File Type y = File Number z = Word Number ata and Control s estination ata Table Address Message File Type Type x File Number (Slave Address) y Word Number (Register) z escription Register/Coil Reference B F N S F S B N F, S, B, N , 6, 5, 6 Coil Status Input Status Holding Registers Input Registers Force Single Coil Pre-set Single Register Force Multiple Coils Pre-set Multiple Registers Broadcast X 3X and Note: For command 5, set the first word of data in the PLC data table to FF (hex) to turn the coil ON and to turn the coil OFF.

8 .2.3. MOBUS IAGNOSTICS COMMANS MOBUS IAGNOSTIC COMMANS USING PLC-3 WOR RANGE R/W COMMANS iagnostic Sub-functions estination ata Table Address Message File Type x File Number y Word Number z iagnostic Sub-function escription ata Value Char (ec) Return ata Query (Loop-back) Restart Communications Return iagnostic Register Change ASCII Input elimiter Force Listen Only Mode Clear Counters and iagnostic Registers Return Bus Message Count Return Bus Communication Error Count Return Bus Exception Error Count Return Slave Message Count Return Slave No Response Count Return Slave NAK Count Return Slave Busy Count Return Bus Character Overrun Count Return IOP Overrun Count (88) Clear Overrun Counter and Flag (88).2. PLC-5 TYPE R/W & WOR RANGE R/W (PLC-5 s and SLC s) MOBUS ATA AN CONTROL COMMANS USING PLC-5 TYPE REA / WRITE COMMANS On receiving a PLC-5 Typed or Word Range Message (MC) a L35-H+ Master decodes the command s estination ata Table Address (TA) File type (character). Then, depending on whether the H+ message is a read or a write command, it can generate the appropriate command as shown below..2.. PLC5 TYPE COMMANS USING NXYY:Z ECOE Use this format if the SLC, PLC, or other device allows up to : to be entered for the file:word. This format allows access to all registers and coils for slaves to. ata and Control s NXYY:Z estination ata Table Address Message Type Register / Coil Reference X Slave Address YY Register / Coil Address Z escription Register/Coil Reference Coil Status Input Status Holding Registers Input Registers Force Single Coil Pre-set Single Register Force Multiple Coils Pre-set Multiple Registers X 3X Note: Leading zeros in the estination ata Table Address can be left out. 5

9 .2..2 PLC5 TYPE COMMANS USING NXYZ:Z ECOE Use this format if the SLC, PLC, or other device allows up to : to be entered for the file:word. This format allows access to all registers and coils for slaves to. ata and Control s NXYZ:Z Message Type estination ata Table Address Register / Coil Slave Register / Coil Reference Address Address X Y Z:Z escription Register/Coil Reference : - - : - - : - - : - - : - - : - - : - - : Coil Status Input Status Holding Registers Input Registers Force Single Coil Pre-set Single Register Force Multiple Coils Pre-set Multiple Registers X 3X Notes:. Leading zeros in the estination ata Table Address can be left out. 2. Register/Coil Address Z before the colon : Thousands digit Z after the colon : Ones to Hundreds digits.2..3 PLC5 TYPE COMMANS USING NYXZ:Z ECOE Use this format if the SLC, PLC, or other device allows up to 255:255 to be entered for the file:word. This format allows access to certain registers and coils for slaves to 3. ata and Control s NYXZ:Z estination ata Table Address Message Type Slave Address Y Register / Coil Reference X Register / Coil Address Z:Z escription Register/Coil Reference : : : : : : : : Coil Status Input Status Holding Registers Input Registers Force Single Coil Pre-set Single Register Force Multiple Coils Pre-set Multiple Registers X 3X Notes:. Leading zeros in the estination ata Table Address can be left out. 2. Register/Coil Address Z before the colon : Thousands digit Z after the colon : Ones to Hundreds digits Register and coil addresses range from, -255, , etc. 3. Slave Address = slave address, = slave address 2, 2 = slave address 3. Slave address 3 cannot access registers or coils above

10 .2.. MOBUS IAGNOSTIC COMMANS MOBUS IAGNOSTIC COMMANS USING PLC-5 TYPE REA / WRITE COMMANS When using PLC-5 Typed / commands, the iagnostic commands have the following PLC-3 address format: Xyyy:ZZZZ iagnostic Sub-functions estination ata Table Address Message X Slave Address yyy Sub-function or ata Field ZZZZ iagnostic Sub-function escription ata ata 2 Char (ec) Return ata Query (Loop-back) Restart Communications Return iagnostic Register Change ASCII Input elimiter Force Listen Only Mode Clear Counters and iagnostic Registers Return Bus Message Count Return Bus Communication Error Count Return Bus Exception Error Count Return Slave Message Count Return Slave No Response Count Return Slave NAK Count Return Slave Busy Count Return Bus Character Overrun Count Return IOP Overrun Count (88) Clear Overrun Counter and Flag (88).2.5 BROACAST COMMAN A-B s H+ network does not typically support Broadcast. However, using a PLC message command with the estination ata Table Address containing a File Address of in the write commands specified in sections.3. and.3.2 above will generate a Broadcast command to all Slave stations. The L35-H+ will not get an ACK response to a Broadcast command from any slave device. Note: This is not supported for section.2..3 PLC-5 Typed commands using the NYXZ:Z decode option. 7

11 .3 H+ MESSAGE COMMAN To read and write to slave devices on it is necessary to program H+ message instructions in one (or more) active PLC s on the H+ network. You can use either PLC-3, PLC-5 Word Range / or PLC-5 Typed / communication commands. Below is an example of a message that uses RSLogix to write words of data starting from N7: to Modicon holding registers to in slave device using PLC-5 NXYZ:Z decoding format. Setup for the L35 Master using the RSLogix message instruction Entering either a PLC-5 Typed / or PLC-3 Word Range / in the Communication determines the kind of decoding scheme will be used and what kind of command will be executed. For more information on the types of decoding schemes, see section.2.3 for PLC-3 commands and section.2. for PLC-5 commands. If using PLC-3 commands, the L35 Master interprets the N of the estination ata Table Address to be command 3 if a PLC-3 Word Range command is issued and command 6 if a PLC-3 Word Range command is issued. Below is a description of the message parameters used to read or write data to slave devices on the network. This PLC Communication : ata Table Address: Size in Elements: Port Number: Target evice ata Table Address: Local H+ Node: Local / Remote: etermines whether the command is a PLC-3 Word Range / or a PLC-5 Typed /. Starting address of the A-B file and word where data is written or read. The number of words from the starting A-B address used in reading or writing data. The H+ port that is connected to the L35 Master. The command, slave station, and registers/coils are entered here in the chosen decoding format. The node of the L35 Master. The network path that the L35 Master is connected through. Check that the Slave Station address and Registers required can be entered into the specific PLC s estination ata Table Address field using PLC programming software. 8

12 .3. A-B TO MOBUS EXAMPLES Below are some examples for writing the destination data table address using the formats discussed in this manual. These examples are to aid the programmer in setting up an Allan-Bradley PLC, SLC, or other device on the H+ network as a master. These examples only show the destination data table address and do not show the source data table address..3.. PLC-3 Word Range s Examples. Integer - Writing to Modicon registers to in slave 5 2. Integer - ing from Modicon registers 322 to 3225 in slave 2 3. Binary - Writing to Modicon coil in slave 3. Binary - Writing to Modicon coils 2 to 36 in slave 6 5. Binary - ing from Modicon coils to 32 in slave 5 H+ Message Instruction Network Message Generated Communication Size In estination TA Slave Register / Coil Register / Coil Elements File:Word Address Start Address End Address. N5: S2: F3: 5 3. B6: F5: Note: When mapping binary files using commands, 2, and 5, the L35 Master maps 6 consecutive coils for every element. Therefore 2 elements will map 32 consecutive coils PLC-5 Typed s (NXYY:Z) Examples. Integer - Writing to Modicon registers to in slave 5 2. Integer - ing from Modicon registers 322 to 3225 in slave 2 3. Binary - Writing to Modicon coil in slave 3. Binary - Writing to Modicon coils 2 to 36 in slave 6 5. Binary - ing from Modicon coils to 32 in slave 5 H+ Message Instruction Network Message Generated Communication Size In estination TA Slave Register / Coil Register / Coil Elements File:Word Address Start Address End Address. N5: N32: B3: 5 3. B6: B5: Note: When mapping binary files using commands, 2, and 5, the L35 Master maps 6 consecutive coils for every element. Therefore 2 elements will map 32 consecutive coils.

13 .3..3 PLC-5 Typed s (NXYZ:Z) Examples. Integer - Writing to Modicon registers to in slave 5 2. Integer - ing from Modicon registers 322 to 3225 in slave 3. Binary - Writing to Modicon coil in slave 3. Binary - Writing to Modicon coils 2 to 36 in slave 6 5. Binary - ing from Modicon coils to 32 in slave H+ Message Instruction Network Message Generated Communication Size In estination TA Slave Register / Coil Register / Coil Elements File:Word Address Start Address End Address. N5: N32: B3: 5 3. B6: B: 2 32 Note: When mapping binary files using commands, 2, and 5, the L35 Master maps 6 consecutive coils for every element. Therefore 2 elements will map 32 consecutive coils..3.. PLC-5 Typed s (NYXZ:Z) Examples. Integer - Writing to Modicon registers to in slave 2. Integer - ing from Modicon registers 322 to 3225 in slave 2 3. Binary - Writing to Modicon coil in slave 3. Binary - Writing to Modicon coils 2 to 36 in slave 2 5. Binary - ing from Modicon coils 3 to 332 in slave 3 H+ Message Instruction Network Message Generated Communication Size In estination TA Slave Register / Coil Register / Coil Elements File:Word Address Start Address End Address. N: N32: B2: 5 3. B: B2: Note: When mapping binary files using commands, 2, and 5, the L35 Master maps 6 consecutive coils for every element. Therefore 2 elements will map 32 consecutive coils.

14 . COMMUNICATIONS SEQUENCE The L35-H+ receives message commands from a PLC over its H+ port, converts them to the appropriate message and sends them out on its serial port. The Slave response is received, translated into an appropriate H+ response and then returned to the originating PLC. Master/Slave protocol does not permit multiple messages on the network. The L35 processes one message at a time out of its port, although it can handle multiple requests from PLC s on the H+ network, the programmer should ensure a response is received before initiating another request. The L35 unit will respond to the H+ interface with appropriate error messages in the event of detectable errors on such as timeouts..5 MOBUS MESSAGE ATA LENGTH CONSIERATIONS The following shows the maximum number of holding registers that can be sent or received in a single message when using the L35 gateway. The limits are because of the different structure of and A-B H+ protocols, and also due to the internal memory structure of the L35. Up to Holding Registers can be read in a single transaction Up to Holding Registers can be written in a single transaction.6 MOBUS MASTER USING BM85 MOBUS PLUS / MOBUS BRIGE MUX The L35-H+ Master will also communicate with Modicon PLCs and other devices on Plus when connected to one of the four ports of a NW-BM85- Plus/ Network Bridge Mux (see L35 users guide for cable drawings). If PLCs and other stations on H+ are required to initiate communications with one or more Modicon PLCs on Plus then the BM85 s Bridge Mux port connecting it to the L35-H+ must be configured in Slave mode. The serial communications parameters for the Bridge Mux port interface to the L35-H+ must be the same as those set in the L35..7 H+ AN MOBUS - GENERAL Each addressed slave station must be a unique address on and the L35-H+ must be the only Master Station on the network. Any station on the H+ network can be a Master that can address any Slave Station from This means that effectively the network can have multiple A-B PLC Masters with the L35 acting as a traffic cop. (Slave) station address numbers may be the same as H+ station address numbers provided that all Slave Station addresses are unique on, and all H+ network addresses are unique on the H+ network.

15 2. MOBUS MASTER NETWORK APPLICATIONS 2.. MASTER TO MOBUS SLAVE NETWORK MOBUS SLAVE NETWORK Modicon PLC Addr 3 H+ Slave Addr 5 H+ STN L35 Master MOBUS MASTER A-B SLC-5/ Stn 3 PC HMI Stn A-B SLC-5/ Stn 5 NOTE: PLC5s, SLC5/s and HMIs on the A-B H+ network can be programmed to communicate with any Slave device on the Slave network. and H+ addresses can be the same MASTER TO MOBUS PLUS VIA BM85 MOBUS BRIGE MOBUS PLUS NETWORK PC HMI/GUI M+ Modicon PLC M+ H+ NETWORK Modicon PLC M+ STN M+ MOBUS PLUS Modicon TO MOBUS NW-BM85 BRIGE RTU L35 Master H+ A-B SLC-5/ Stn 2 A-B SLC-5/ Stn A-B SLC-5/ Stn 5 NOTE: PLC5s, SLC5/s and HMIs on the H+ network can be programmed to communicate with any station on the Plus network 2