Converteam LV7000 - Coil Register Operations; Control Word Bit Definitions

4 Modbus/TCP
Ethernet Option Board / 700.002 735 AE01 4-3
The following table shows a MODBUS query that changes the engine's rotation direction by entering “1” for
control-word bit 1 value. This example uses the 'Write Coil' MODBUS function. Note that Control word is
application specific and use of bits may vary depending on it.
Query:
0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x01, 0x05, 0x00, 0x01, 0xFF, 0x00
Data Purpose
0x00 Transaction ID
0x00 Transaction ID
0x00 Protocol ID
0x00 Protocol ID
0x00 Length
0x06 Length
0x01 Unit identifier
0x05 Write coil
0x00 Reference number
0x01 Reference number
0xFF Data
0x00 Padding
Table 4-4: Writing a Single Control Word Bit
4.3.2 0017 – 00018 Counters (Read Only)
The frequency converter's operation day trip counter and energy trip counter can be reset by entering “1” as
the value of the coil in request. When the value “1” is entered, the device resets the counter. However, the
device does not change the Coil value after reset but maintains the “0” mode.
Address Function Purpose
0017 Clear OpDay Clears OpDay counter
0018 Clear MWh Clears MWh counter
Table 4-5: Counters
The following table represents a MODBUS query that resets both counters simultaneously. This example
applies the 'Force Multiple Coils' function. The reference number indicates the address after which the
amount of data defined by the 'Bit Count' is written. This data is the last block in the MODBUS/TCP message.
Data Purpose
0x00 Transaction ID
0x00 Transaction ID
0x00 Protocol ID
0x00 Protocol ID
0x00 Length
0x08 Length
0x01 Unit identifier
0x0F Force multiple coils
0x00 Reference number
0x10 Reference number
0x00 Bit count
0x02 Bit count
0x01 Byte Count
0x03 Data
Table 4-6: Force Multiple Coils Query