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APPLICATIONNOTEAN‐BEI‐P2‐038 Date:15/02/12

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AN‐BEI‐P2‐038ModbusRTUControlandRegisterMapping

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BFIApplicationsSupportLibrary

ApplicationNote AN‐BEI‐P2‐038

Title ModbusRTUControlandRegisterMapping

RelatedProducts BeijerFrequencyInverterP2

Level

3

1–Fundamental‐Nopreviousexperiencenecessary

2–Basic–SomeBasicdrivesknowledgerecommended

3–Advanced–SomeBasicdrivesknowledgerequired

4–Expert–Goodexperienceintopicofsubjectmatterrecommended

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Overview:

ThisdocumentprovidesanoverviewoftheModbusRTUmemorymappingthatisimplementedintheBeijerFrequencyInverter

P2 drive, detailing which addresses areused to read andwrite data to / from Beijer Frequency Inverter P2 in a Modbus RTU

network.AlldataregisterswithinthedriveareHolding

Registers,andcanbeaccessedbymeansoftheModbuscommands03

ReadMultipleHoldingRegistersand06WriteSingleRegisteronly.

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TheModbusRequestPDUspecifiesthestartingregisteraddressandthenumberofregisters.Inthiscase,with some Modbus

Master Systems, it may be necessary to subtract

 1 from the register number (e.g. some systems treat holding register 1 as

address0).

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TheManufactureradoptsapolicyofcontinuousimprovementandwhilsteveryefforthasbeenmadetoprovideaccurateandup

todateinformation,theinformationcontainedinthisdocumentshouldbeusedforguidancepurposes

onlyanddoesnotform

thepartofanycontract.

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MODBUSRTUProtocolSpecification:

ThefollowingtablehighlightsthespecificationfortheModbusRTUimplementationinBeijerFrequencyInverterP2

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Protocol ModbusRTU

Errorcheck CRC

Baudrate 9600bps, 19200bps, 38400bps, 57600bps, 115200bps

(default)

AdjustableinParameterP5‐03

Dataformat 1startbit,8databits,1stopbits,noparity.

1startbit,8databits,2stopbits,noparity.

1startbit,8databits,1stopbits,evenparity.

1startbit,8databits,1stopbits,oddparity.

AdjustableinParameterP5‐04

Physicalsignal RS485(2‐wire)

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Summary of content (16 pages)

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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 BFI Applications Support Library Application Note AN‐BEI‐P2‐038 Title Modbus RTU Control and Register Mapping Related Products Beijer Frequency Inverter P2 1 – Fundamental ‐ No previous experience necessary Level 3 2 – Basic – Some Basic drives knowledge recommended 3 – Advanced – Some Basic drives knowledge required 4 – Expert – Good experience in topic of subject matter recommended Overview: This document provides an overview of the Modbus RTU memory mapp
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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 Modbus Telegram Structure: The following Modbus Commands are supported • 03 Read Holding Registers • 06 Write Single Holding Register The telegram structure is as follows:‐ Command 03 – Read Holding Registers Master Telegram Length Slave Response Slave Address 1 Byte Slave Address Function Code (03) 1 Byte Function Code (03) 1st Register Address 2 Bytes Byte Count No. Of Registers 2 Bytes 1st Register Value CRC Checksum 2 Bytes 2nd Register Value Etc...
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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 Memory Map: Table 1: Control and status registers Register 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 Upper byte Lower Byte Drive Control Command Word Frequency Setpoint (Reference) Torque Setpoint (Reference) Modbus ramp control time Speed reference Error code Drive status Output Frequency Output Current Motor Torque Output Power Digital Input Status Rating ID Power rating Vol
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APPLICATION NOTE AN‐BEI‐P2‐038 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 User register 13 User register 14 User register 15 Analog output 1 user Analog output 2 user Reserved Reserved Relay output 1 user Relay output 2 user Relay output 3 user Relay output 4 user Relay output 5 user User display scaling User display decimal User speed reference User torque reference User ramp Scope index 1, 2 Date: 15/02/12 03, 06 03, 06 03, 06 03, 06 03, 06 03, 06 03, 06 03, 06 03, 06 03, 06 03, 06 03, 06 03,
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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 Register 7: Output Frequency This register shows the output frequency. The data is 16bit integer with one decimal place. E.g. value 123 gives 12.3Hz. Value ‐234 (0xFF16) gives ‐23.4Hz. Register 8: Output Current This register displays the output current from the drive. The data is 16bit integer with one decimal place. E.g. 156 = 15.6A, 12 = 1.2A. Register 9: Output Torque This register displays the motor torque level.
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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 Register 22: Pre Ramp Speed Reference Value This register contains the reference speed information that being used by the drive for motor speed control. The data is in Hz and with one decimal place (i.e. 234 = 23.4Hz) Register 23: DC bus voltage This register contains drive internal DC bus voltage information. The value is displayed as volts, with no decimal places. Register 24: Drive temperature This register contains drive temperature information.
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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 Drive Parameters: All User Adjustable parameters in Groups 1 to 8 can be accessed by Modbus. For further details regarding the parameter functions, please refer to the Beijer Frequency Inverter P2 User Guide.
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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 Group 2 : Extended parameter set (Level 2) Parameter Number P2‐01 P2‐02 P2‐03 P2‐04 P2‐05 P2‐06 P2‐07 P2‐08 P2‐09 P2‐10 Register Number 201 202 203 204 205 206 207 208 209 210 P2‐11 211 P2‐12 P2‐13 P2‐14 212 213 214 Description Range Scaling Type Preset speed 1 Preset speed 2 Preset speed 3 Preset speed 4 Preset speed 5 Preset speed 6 Preset speed 7 Preset speed 8 Skip frequency centrepoint Skip frequency band 0 to 30000 (Limited by P1‐01 Settin
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APPLICATION NOTE AN‐BEI‐P2‐038 Parameter Number Register Number Description P2‐18 218 User relay 2 output function select P2‐19 P2‐20 P2‐21 219 220 221 User relay 2 upper limit User relay 2 lower limit Display scaling factor P2‐22 222 Display scaling source P2‐23 223 Zero Speed holding time P2‐24 224 Effective switching frequency P2‐25 225 Fast deceleration ramp time P2‐26 226 Spin start enable P2‐27 227 Standby mode P2‐28 228 Slave speed scaling control P2‐29 229 Slave Speed
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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 Group 3 : User PID control (Level 2) Parameter Number P3‐01 P3‐02 P3‐03 Register Number 301 302 303 Description Range Scaling Type User PID Proportional Gain User PID Integral time constant User PID Differential time constant 1 = 0.1 1 = 0.1 1 = 0.
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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 Group 5 : Fieldbus communications (Level 2) Parameter Number P5‐01 Register Number 501 Description Range Scaling Fieldbus drive address 0…63 125kbps 250kbps 500kbps 1Mbps 9.6kbps, 19.2kpbs, 38.4kpbs, 57.6kpbs, 115 kbps N‐1 : None Parity 1 stop bit N‐2 : None parity 2 stop bits O‐1 : Odd parity 1 stop bit E‐1 : Even parity 1 stop bit 0...0.1... 5.
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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 Group 6 : Advanced Parameter set (Level 3) Par Register Description Range 0: Disabled 1: Enable (IO and DSP) 2: Enable (IO only) 3: Enable (DSP only) 0: Disable 1: Enable 1 to 60 0 ‐ 250 0: Disabled 1: Enable 0 to 65535 0 to 500 0, 5 to 20 0 to 250 0: Disable 1: Enable 0 to 2500 0 to 2500 0 to 50 0 to 50 0 to 2000 0 to 250 0 to 250 0 : Auto 0 to 250 0, Min value to 200 0 to 20000 0 to 200 0: Disable 1: Enable 0: Disable 1: Enable 0 … 60 000 h (0 = disabled)
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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 Group 8 : Application Specific Parameters ‐ Level 3 Parameter Number Register Number P8‐01 801 P8‐02 802 P8‐03 803 P8‐04 804 P8‐05 805 P8‐06 806 P8‐07 807 P8‐08 808 P8‐09 809 P8‐10 810 P8‐11 811 P8‐12 812 P8‐13 813 Description Range Scaling Type Accel Ramp 2 0 to 60000 U16 Speed boundary – Accel ramp 1 Æ 2 Accel Ramp 3 0 to 30000 (Limited by P1‐01 Setting) S2…S3 1 = 0.01s S4…S7 1 = 0.1s 3000 = 50.
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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 Drive error code information in Register 6: In the event of a trip, an error code is returned in the High Byte of the drive status word. The fault values correspond to the following table. Fault Code no‐Flt OI‐b OL‐br O‐I I.
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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 Modbus Exception Response Telegrams Under some circumstances, the drive may reply with an Exception Response (error) in response to a request telegram sent from the network master, for example where the master tries to read a register which does not exist. Exception Responses which can be generated by the drive are listed below :‐ Exception Code 1: Invalid Request Returned under the following conditions • Network Master sends an unsupported Modbus command (e.
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APPLICATION NOTE AN‐BEI‐P2‐038 Date: 15/02/12 Appendix: Revision History Version Comments 1.00 First Release 1.