M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation

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Serial Interface (Modbus RTU) Structure of the Master Request Address: ● The address (1 to 255) of the frequency inverter to be sent the request is entered in parameter S2.3. Only the frequency inverter with this address can respond to the request ● Address 0 is used as a so-called Broadcast (message to all slaves) from the master. In this mode, individual slaves cannot be addressed and data cannot be output from the slaves Data The length of the data block (Data: N x 1 Byte) depends on the function code. This consists of two hexadecimal character sets between 00 and FF. The data block contains additional information for the slave in order to carry out the operation defined by the master in the function code. Example: number of parameters to be processed. CRC The telegrams in the Modbus RTU have a CRC (Cyclical Redundancy Check). This CRC field consists of two bytes that contain a binary 16 bit value. The CRC check is always run independently of the parity check for the individual characters of the telegram. The CRC result is attached to the end of the telegram by the master. The slave recalculates while receiving the telegram and compares the calculated value with the actual value in the CRC field. If both values are not identical, an error is set. Structure of the Slave Response Required Transfer Time ● The time between receiving a request from the master and the response of the frequency inverter is at least 3.5 characters (rest time) ● Once the master has received a response from the frequency inverter, it must wait for at least the rest time before it can send a new request 132 M-Max Series Adjustable Frequency Drive MN04020003E—April 2011 www.eaton.com Function Code: The function code defines the type of message. The following operations can be executed on the M-Max: Function Code (hex) Designation Description 03 Read Holding Registers Reading of the holding registers in the slave (process data, parameters, configuration) A master request enables up to 11 registers to be read 04 Read Input Registers Reading of the input registers in the slave (process data, parameters, configuration) A master request enables up to 11 registers to be read 06 Write Single Register Writing of a holding register in the slave With a general telegram (Broadcast) the appropriate holding registers are written in all slaves The register is read back for comparison 10 Write Multiple Register Writing of several holding registers in the slave With a general telegram (Broadcast) the appropriate holding registers are written in all slaves A master request enables up to 11 registers to be read Normal Slave Response ● If the master request contains a write register function (function code 06 or 16), the frequency inverter immediately returns the request as a response ● If the master request contains a read register function (function code 03 or 04), the frequency inverter returns the read data with the slave address and the function code as a response Slave Response in the Event of an Error If a request contains an error (for example, incorrect data address or incorrect data value) other than a transfer error, the frequency inverter returns an exception message without executing anything. You can evaluate the exception message
Structure of Exception Message ● Address (of the master request) ● Function code (of the master request): MSB is set to 1 (for example, with function code 06 = 1000 0110) ● Data field contains the error code (is described in the following table) ● CRC Serial Interface (Modbus RTU) Error Code Description Exception Code Meaning Description 01 Illegal function This function is not supported 02 Illegal data address The address was not found 03 Illegal data value The data format is not permissible or is incorrect 04 Slave device error Occurrence of a non-regenerative error while the slave attempted to execute a slave response 06 Slave device busy The slave has received the master request error-free. However, it is engaged in processing a lengthy command Example: Master request that contains a non-existent data address. Master request: 01 06 0802 0001 EBAA (hex) hex Name 01 Slave address 06 Function code (here: Write a holding register) 0802 2050 (dec). The ID number of the written register is 2051 (dec) as the master PLC has an offset of +1 0001 Content (2 bytes) for register 42051: 0000 0000 0000 0001 (bin) EBAA CRC Slave response: 01 86 02 C3A1 (hex) hex Name 01 Slave address 86 Function code (here: Write a holding register) MSB was set to 1 02 Error code: Stated address not found. C3A1 CRC No Slave Response: In the following cases, the frequency inverter ignores the request and does not send a reply: ● On receiving a broadcast request ● If the request contains a transmission error ● If the slave address in the request does not match that of the frequency inverter ● With an invalid data length, (for example, reading of 12 registers) error message F08 is triggered in the MMX ● With a CRC or parity error With a CRC error the value of system parameter S2.1 is increased by 1 (xx = number of faulty messages) ● If the time interval between the messages is less than 3.5. characters The master must be programmed to repeat the request if it does not receive a response within a specified time. M-Max Series Adjustable Frequency Drive MN04020003E—April 2011 www.eaton.com 133
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M-Max Series Adjustable Frequency D
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About this Manual Input Supply Volt
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M-Max Series Overview Component Ide
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M-Max Series Overview Nameplate Rat
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M-Max Series Overview Examples Labe
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M-Max Series Overview General Rated
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M-Max Series Overview Power Connect
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M-Max Series Overview Block Diagram
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M-Max Series Overview Proper Use Th
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Engineering Engineering Introductio
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Engineering Voltage Balance Because
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Engineering The leakage current to
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Engineering Motor and Circuit Type
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Installation Installation Introduct
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Installation Dismantling from Mount
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Installation EMC-Compliant Setup (E
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Installation Connection to Power Se
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Installation Arrangement and Connec
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Installation Connection on Control
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Installation Control Signal Termina
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Installation Analog Outputs The fre
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Installation Digital Outputs (Relay
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Installation Block Diagrams The fol
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Installation MMX32, MMX34 and MMX35
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Operation Operation Commissioning C
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Operation Commissioning with Contro
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Operation Start-Stop Command with M
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Error and Warning Messages Error an
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Error and Warning Messages List of
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Parameters Parameters Control Unit
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Parameters Setting Parameters The f
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Parameters Parameter Menu (PAR) You
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Parameters Quick Start Parameter Gu
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Parameters Analog Input (P2) In par
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Parameters Filter Time Constant The
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Parameters Digital Inputs PNU ID Ac
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Parameters Digital Inputs, continue
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Parameters Digital Inputs, continue
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Parameters Digital Outputs (P5) The
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Parameters Digital Outputs, continu
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Parameters Drives Control (P6) In t
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Page 100 and 101: Parameters Drives Control, continue
Page 102 and 103: Parameters Motor (P7) For optimal o
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Page 110 and 111: Parameters PID Controller, continue
Page 112 and 113: Parameters Activating/Deactivating
Page 114 and 115: Parameters Fixed Frequency Setpoint
Page 116 and 117: Parameters Sequence Control The seq
Page 118 and 119: Parameters Example A P10.9 = 1: Exe
Page 120 and 121: Parameters Example C Comparable exa
Page 122 and 123: Parameters V/Hz-Characteristic Curv
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Page 126 and 127: Parameters Braking (P12) In paramet
Page 128 and 129: Parameters Braking, continued PNU I
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Page 132 and 133: Parameters Logic Function (P13) The
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Page 136 and 137: Parameters Second Parameter Set, co
Page 138 and 139: Parameters Example 2 Stop function
Page 140 and 141: Parameters System Parameter, contin
Page 142 and 143: Parameters Operational Data Indicat
Page 144 and 145: Parameters Setpoint Input (REF), co
Page 146 and 147: Serial Interface (Modbus RTU) Modbu
Page 150 and 151: Serial Interface (Modbus RTU) Data
Page 152 and 153: Serial Interface (Modbus RTU) Gener
Page 154 and 155: Serial Interface (Modbus RTU) Expla
Page 156 and 157: Appendix A Appendix A Special Techn
Page 158 and 159: Appendix A Device Series MMX32 MMX3
Page 160 and 161: Appendix A Device Series MMX35 MMX3
Page 162 and 163: Appendix A Dimensions and Frame Siz
Page 164 and 165: Appendix A Quick Start Parameter Gu
Page 166 and 167: Appendix A All Parameters When firs
Page 168 and 169: Appendix A Digital Input, continued
Page 170 and 171: Appendix A Digital Output, continue
Page 172 and 173: Appendix A Motor Access FS PNU ID R
Page 174 and 175: Appendix A Fixed Frequencies Access
Page 176 and 177: Appendix A Braking Access FS PNU ID
Page 178 and 179: Appendix A Second Parameter Set Acc
Page 180 and 181: Appendix A System Parameters, conti
Page 184: Eaton’s Electrical Sector is a gl
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M-Maxâ„¢ Series Adjustable Frequency Drive - Eaton Corporation

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