Schneider Electric VW3 A3 303 user manual Output variables Logic address Default assignment

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8. Modbus protocol

8. 11. Communication scanner

The communication scanner can be used to enhance application performance. The drive automatically copies non-contiguous parameters to an input table and an output table. Thus, the copy of several non-contiguous parameters can be read or written in a single request (an operation which would normally have required several Modbus requests).

The input table and the output table each contain 8 variables.

Output variables

Logic address

Default assignment

[Com Scan Out1 val.] (nC1)

12 761

= 16#31D9

Control word (CMd)

 

 

 

 

[Com Scan Out2 val.] (nC2)

12 762

= 16#31DA

Speed reference (LFrd)

[Com Scan Out3 val.] (nC3)

12 763

= 16#31DB

Not used

[Com Scan Out4 val.] (nC4)

12 764

= 16#31DC

Not used

 

 

 

 

[Com Scan Out5 val.] (nC5)

12 765

= 16#31DD

Not used

[Com Scan Out6 val.] (nC6)

12 766

= 16#31DE

Not used

[Com Scan Out7 val.] (nC7)

12 767

= 16#31DF

Not used

 

 

 

 

[Com Scan Out8 val.] (nC8)

12 768

= 16#31E0

Not used

Input variables

Logic address

Default assignment

[Com Scan In1 val.] (nM1)

12 741

= 16#31C5

Status word (EtA)

[Com Scan In2 val.] (nM2)

12 742

= 16#31C6

Output speed (rFrd)

 

 

 

 

[Com Scan In3 val.] (nM3)

12 743

= 16#31C7

Not used

[Com Scan In4 val.] (nM4)

12 744

= 16#31C8

Not used

[Com Scan In5 val.] (nM5)

12 745

= 16#31C9

Not used

 

 

 

 

[Com Scan In6 val.] (nM6)

12 746

= 16#31CA

Not used

[Com Scan In7 val.] (nM7)

12 747

= 16#31CB

Not used

[Com Scan In8 val.] (nM8)

12 748

= 16#31CC

Not used

 

 

 

 

The values of these communication scanner variables can be displayed on the graphic display terminal using the

[1.2-MONITORING]menu, [COMMUNICATION MAP] (CMM) submenu (see section "7. Diagnostics - 7.4 Communication scanner").

These parameters can be accessed via all the read and write requests supported by the drive.

There is a marked improvement in performance for the following functions:

Code

Modbus name

Description

Size of data

3 = 16#03

Read Holding Registers

Read N output words

63 words, max.

4 = 16#04

Read Input Registers

Read N input words

63 words, max.

16 = 16#10

Write Multiple Registers

Write N output words

61 words, max.

23 = 16#17

Read/Write Multiple Registers

Read/write N words

20/20 words max.

43 = 16#2B

Read Device Identification

Identification

 

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Contents Altivar Contents Before you begin Electric shock will result in death or serious injuryProgramming Manual Installation ManualDocumentation structure Communication Parameters ManualPresentation IntroductionNotation Receipt Hardware setupInstalling the card in the drive Hardware descriptionChoosing polarization Switch codingCoding the address Address 1234Wiring recommendations Connecting to the busModbus RS485 standard Connection accessories Connection via RJ45 wiring systemConnection cables TWD XCA RJ030 Connection cables for the masterType of master Master interface Description Catalog number TSX SCP CMRS485 double shielded twisted pair Connection via junction boxesDescription Catalog Number Subscriber socket CablesTSX CSA500 TSX P ACCConfiguration Communication parametersControl via Modbus or the terminals in I/O profile Control CommandControl via Modbus in I/O profile Parameter Value CommentControl via Modbus in Drivecom profile Control via Modbus or the terminals in Drivecom profileConfiguration RDY NET Example of configuration via the graphic display terminalCommunication scanner COM. Scanner InputCommunication faults COM. Fault ManagementFormat CONFIG. COMM. MAPMonitored parameters Format Range Terminal displayLEDs DiagnosticsChecking the address Green RUN Red ERR Meaning Corrective actionCOM. Scanner Input MAP RUN NETCommunication MAP COM Scan Output MAP CMD. Word ImageOutput variable Scanner parameter Input variable Scanner parameterCOM Scan Output MAP Communication fault Card faultPrinciple Modbus protocolSlave Slave j Slave k Modes RTU modeAscii mode Slave address Function code DataRead Holding/Input Registers 3/4 Modbus functions availableCode Modbus name Description Broadcast Size of data Write Single Register Diagnostics Get Comm Event Counter 11 = 16#0B Write Multiple Registers 16 = 16#10Read/Write Multiple Registers 23 = 16#17 Read Device Identification 43 = 16#2B MachineExample of positive response MEIInput variables Logic address Default assignment Output variables Logic address Default assignmentCode Modbus name Description Size of data Parameter Logic Read Input variable address Logic address Default valueParameter Logic Input monitoring Output controlParameter assigned Value Parameter assignedException responses Code Error codeResponse Read non-existent or protected parameters Logic address Parameter ValueAppendix RS485 standardModbus 2-wire standard schematic MasterModbus 4-wire standard schematic Uni-Telway schematic Wire Jbus schematic Type of trunk cable Cable with 1 shielded twisted pairDifferent scenarios Creating a Modbus bus using non-standard equipmentRecommendations Calculating the polarization ExampleContact no. Signal RS485 schematic for the cardCard connector pinout SUB-DAtv71ModbusJbusENV1 2005-05
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