WEG MVW3000 A0040 V023, User Manual

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MVW3000 | 9-33
9
Communication Networks
MVW3000 | 9-33
Table 9.22: Example of telegram structure
Request (Master) Response (Slave)
Field Value Field Value
Slave address 01h Slave address 01h
Function 06h Function 06h
Register (byte high) 13h Register (byte high) 13h
Register (byte low) 8Ch Register (byte low) 8Ch
Value (byte high) 10h Value (byte high) 10h
Value (byte low) 00h Value (byte low) 00h
CRC- 41h CRC- 41h
CRC+ 65h CRC+ 65h
For this function, the slave response will be again a copy identical to the request made by the master. As already
informed above, the basic variables are addressed from 5000, thus the basic variable 4 will be addressed at 5004
(138Ch).
9.3.3.5 Function 15 - Write Multiple Coils
This function allows writing values for a group of bits that must be in numerical sequence. This function can also be
used to write a single bit (the values are always hexadecimal, and each field represents one byte).
Table 9.23: Telegram structure
Request (Master) Response (Slave)
Slave address Slave address
Function Function
Initial bit address (byte high) Initial bit address (byte high)
Initial bit address (byte low) Initial bit address (byte low)
Number of bits (byte high) Number of bits (byte high)
Number of bits (byte low) Number of bits (byte low)
Byte Count Field (number of data bytes) CRC-
Byte 1 CRC+
Byte 2 -
Byte 3 -
etc a -
CRC- -
CRC+ -
The value of each bit that is being sent is placed at a position of the data bytes sent by the master.
The first byte, in the bits 0 to 7, receives the 8 first bits by starting from the initial address indicated by the master.
The other bytes (if the number of written bits is greater than 8) remain in sequence. If the number of inscribed bits
is not a multiple of 8, the remaining bits of the last byte must be filled in with 0 (zero).
Example: Writing of the commands for start (bit 100 = 1), general enable (bit 101 = 1) and Reverse speed direction
(bit 102 = 0), to an MVW3000 at the address 1:
Table 9.24: Example of telegram structure
Request (Master) Response (Slave)
Field Value Field Value
Slave address 01h Slave address 01h
Function 0Fh Function 0Fh
Initial bit (byte high) 00h Initial bit (byte high) 00h
Initial bit (byte low) 64h Initial bit (byte low) 64h
Number of bits (byte high) 00h Number of bits (byte high) 00h
Number of bits (byte low) 03h Number of bits (byte low) 03h
Byte Count 01h CRC- 54h
Value for the bits 03h CRC+ 15h
CRC- BEh - -
CRC+ 9Eh - -