Rockwell-automation 22B PowerFlex 40 Custom Firmware Inst. - Option AF Instrukcja Użytkownika Pobierz pdf (Strona 3)

Table A Response PDU

Table B Error PDU

Examples

Writing Drive Parameters

Write Parameters 38 through 40

• Parameter P038 [Speed Reference] = 3, “4-20mA Input”

• Parameter P039 [Accel Time 1] = 5.0 Sec

• Parameter P040 [Decel Time 1] = 15.0 Sec

Writing Control Registers

In the PowerFlex 40 drive the logic command can be accessed at address

0x2000 and the frequency reference can be accessed at address 0x2001.

These addresses can be written sequentially using Modbus function 16

(0x10). To set the following values:

• Logic Command = 0x1234

• RS485 Frequency Reference = 57.3 Hz

Field Name Length Range

Function Code 1 Byte 0x10

Starting Address 2 Bytes 0x0000 to 0xFFFF

Quantity of Registers 2 Bytes 1 to 123 (0x7B)

Field Name Length Range

Error Code 1 Byte 0x90

Exception Code 1 Byte 0x01 through 0x04

Request Response

Field Name (Hex) Field Name (Hex)

Function 10 Function 10

Starting Address Hi 00 Starting Address Hi 00

Starting Address Lo 26 Starting Address Lo 26

Quantity of Registers Hi 00 Quantity of Registers Hi 00

Quantity of Registers Lo 03 Quantity of Registers Lo 03

Byte Count 06

Registers Value Hi 00

Registers Value Lo 03

Registers Value Hi 00

Registers Value Lo 32

Registers Value hi 00

Registers Value Lo 96

Important: For bit descriptions, see Writing (06) Logic Command Data

in Appendix C of the PowerFlex 40 User Manual.

Error Responses

Table A Exception Code Table

If an attempt is made to write a sequence of parameters that includes

non-writeable parameters, the message will continue to write all writable

values, but will return an error code. If any of the parameters in the

sequence is read only, or run write inhibited, an error code of “4” will be

returned. If the value to be written is out of range or some other illegal

value, an error code of “3” will be returned. The returned error code does

not identify which of the parameters were not written.

Only a maximum of four control registers can be written beginning at

address 0x2000. If the starting address of the message is 0x2000 then the

length of the message must be 4 or less. If the starting register range and

the size of the intended write will reach beyond register 0x2003, an error

code of “2” will be returned and values will not be written to any of the

intended registers.

Request Response

Field Name (Hex) Field Name (Hex)

Function 10 Function 10

Starting Address Hi 20 Starting Address Hi 20

Starting Address Lo 00 Starting Address Lo 00

Quantity of Registers Hi 00 Quantity of Registers Hi 00

Quantity of Registers Lo 02 Quantity of Registers Lo 02

Byte Count 04

Registers Value hi 12

Registers Value Lo 34

Registers Value hi 02

Registers Value Lo 3D

Code Meaning

1 Illegal Function Code: The function code received in the query message is not

available for the receiving device.

2 Illegal Data Address: The data address received in the query message is not

available for the receiving device.

3 Illegal Data Value: The data value received in the query message is not

available for the receiving device.

4 Service Failure: The receiving device is unable to perform the requested action.

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