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Modbus services
38 S1A53844 01/2011
Write indirect block (16)
Function 16 = 16#10, quantity = 2
The Write indirect block function permits to write 2 parameters. These parameters can be chosen by
parameters [Block write data 1] (F870) and [Block write data 2] (F871) (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
Request:
Response:
Error response:
Refer to "Error response", page 41
.
Example: Write value 60Hz in the parameter [Frequency Command] (FA01) and run forward command in
Altivar 212 slave 1.
Configuration:
[Block write data 1] (F870) = 1: [Command word 1] (FA00)
[Block write data 2] (F871) = 3: [Frequency reference from serial comm.] (FA01)
• The Altivar 212 accepts the request:
• The Altivar 212 rejects the request because it is busy or F870 is 0:
Parameters Modbus
address
Adjustment range Default
setting
Valid
after
[Block write data 1] (F870) 2160
16#870
0 [No select]: No selection
1 [Command word 1]
2 [Command word 2]
3 [Frequency Setpoint]
4 [Relay command]: Ouput data on the terminal board
5 [FM command]: Analog output for communication
6 [Speed Setpoint]
0
Power
cycle
[Block write data 2] (F871) 2161
16#871
Slave no. Function
code
Starting address Quantity of register Byte
count
First register value ------- CRC16
10
18
(fixed)
70
(fixed)
00
(fixed)
02
(fixed)
04 (fixed)
1 byte 1 byte 2 bytes 2 bytes 1 byte 2 bytes 2 bytes
Slave no. Function code Starting address Quantity of register CRC16
10
18 (fixed) 70 (fixed) 00 (fixed) 02 (fixed)
1 byte 1 byte 2 bytes 2 bytes 2 bytes
Slave no.
Function code
Exception code
CRC16
90
1 byte 1 byte 1 byte 2 bytes
Request: 01 10 18 70 00 02 04 C4 00 17 70 6D AF
Response: 01 10 18 70 00 02 43 B3
Request: 01 10 18 70 00 02 04 C4 00 17 70 6D AF
Response: 01 90 04 4D C3