WEG MVW3000 A0040 V023, User Manual

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9-34 | MVW3000
9
Communication Networks
9-34 | MVW3000
As only three bits are being written, the master needed only one byte to transmit the data. The transmitted values
are in the three less significant bits of the byte that contains the value for the bits. The other bits of this byte
remained with the value 0 (zero).
9.3.3.6 Function 16 - Write Multiple Registers
This function allows writing values to a group of registers that must be in numerical sequence. This function can
also be used to write a single register (the values are always hexadecimal values and each field represents one
byte).
Table 9.25: Telegram structure
Request (Master) Response (Slave)
Slave address Slave address
Function Function
Initial register address (byte high) Initial register address (byte high)
Initial register address (byte low) Initial register address (byte low)
Number of registers (byte high) Number of registers (byte high)
Number of registers (byte low) Number of registers (byte low)
Byte Count Field (number of data bytes) CRC-
Data 1 (high) CRC+
Data 1 (low) -
Data 2 (high) -
Data 2 (low) -
etc -
CRC- -
CRC+ -
Example: Writing an acceleration time (P0100) of 1.0 s and a deceleration time (P0101) of 2.0 s, to an MVW3000 at
the address 20:
Table 9.26: Example of telegram structure
Request (Master) Response (Slave)
Field Value Field Value
Slave address 14h Slave address 14h
Function 10h Function 10h
Registrador inicial (high) 00h Registrador inicial (high) 00h
Registrador inicial (low) 64h Registrador inicial (low) 64h
Nº de registradores (high) 00h Nº de registradores (high) 00h
Nº de registradores (low) 02h Nº de registradores (low) 02h
Byte Count 04h CRC- 02h
P0100 (high) 00h CRC+ D2h
P0100 (low) 0Ah - -
P0101 (high) 00h - -
P0101 (low) 14h - -
CRC- 91h - -
CRC+ 75h - -
Considering that the two parameters have a resolution of one decimal place, in order to write 1.0 and 2.0 seconds,
the values 10 (000Ah) and 20 (0014h) must be transmitted, respectively.
9.3.3.7 Function 43 - Read Device Identification
It is an auxiliary function, which allows reading the manufacturer name, model and firmware version of the product.
It has the following structure: