Modbus services
Read indirect block (3)
Function 3, quantity = 1 ... 5
The Read indirect block function permits to read 1 to 5 parameters. These parameters can be chosen by parameters F875 ... F879 (refer to "Configuration of the indirect blocks", page 27)
Access to the parameter
This parameter is accessible in the [COMMUNICATION MENU] COM submenu of [PROGRAMMING MENU] Programming mode.
Description
Parameters | Modbus | Adjustment range | Default | Valid | |
| address |
|
| setting | after |
|
|
|
|
|
|
[Block read data 1] (F875) | 2165 | 0 | [No select]: No selection |
|
|
| 16#875 | 1 | [Status info] |
|
|
|
| 2 | [Freq. out]: Output frequency |
|
|
[Block read data 2] (F876) | 2166 |
|
| ||
3 | [Motor current]: Ouput current |
|
| ||
| 16#876 |
|
| ||
| 4 | [Ouput volt]: Ouput voltage |
| Power | |
[Block read data 3] (F877) | 2167 | 5 | [Alarm info]: Alarm information | 0 | |
| 16#877 | 6 | [PID feedback value] | cycle | |
|
| ||||
|
| 7 | [Input term. mon]: Input terminal board monitor |
|
|
[Block read data 4] (F878) | 2168 |
|
| ||
8 | [Out term. mon]: Output terminal board monitor |
|
| ||
| 16#878 |
|
| ||
| 9 | [VIA monitor]: VIA terminal board monitor |
|
| |
[Block read data 5] (F879) | 2169 | 10 [VIB monitor]: VIB terminal board monitor |
|
| |
| 16#879 | 11 [Mot speed mon.]: Ouput motor speed monitor |
|
| |
|
|
|
|
|
|
Request:
Slave no. | Function code | Starting address | Quantity of registers | CRC16 | ||||
| 03 | Hi | Lo | Hi |
| Lo | Lo | Hi |
| 18 (fixed) | 75 (fixed) | 00 |
| 02 to 05 |
|
| |
|
|
|
|
| ||||
1 byte | 1 byte | 2 bytes |
| 2 bytes | 2 bytes | |||
Response:
Slave no. | Function code | Byte count | First register value | ||
| 03 |
| Hi |
| Lo |
|
|
|
|
|
|
1 byte | 1 byte | 1 byte |
| 2 bytes | |
Last register value | CRC16 | |||
Hi |
| Lo | Lo | Hi |
|
|
|
|
|
| 2 bytes | 2 bytes | ||
Error response:
Slave no. | Function code | Exception code | CRC16 | |
| 83 |
| Lo | Hi |
1 byte | 1 byte | 1 byte | 1 byte | |
Example: Read indirect block in an drive with slave address 1.
Configuration parameters:
[Block read data 1] (F875) = 1: [drive Status] (Fd01)
[Block read data 2] (F876) = 2: [Output frequency] (Fd00)
[Block read data 3] (F877) = 3: [Output current] (FE03)
[Block read data 4] (F878) = 4: [Output voltage] (FE05)
[Block read data 5] (F879) = 5: [Alarm code] (FC91)
•Read indirect block of 5 parameters:
Request:
01
03
18 75
00 05
92 B3
Response:
01
03
0A
64 04
17 70
00 00
26 FB
00 80
1E 29
34 | S1A53844 01/2011 |
