Balluff BIS M-370-000-A02, Manual, Page: 106 / 198

MODBUS TCP INTERFACE
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6
6.2.1 Modbus TCP - Command Packet Structure
Consume Registers hold data that is destined for the BIS M-626_. Modbus TCP commands
must be placed in the holding registers, starting at address 40001, of Device ID 01 (Node
Input Page 01). Commands utilize at least six registers (double-byte values or words).
Modbus
Address
(4xxxx / 3xxxx)
Read / Write
Privilege
Register Description
(40001) 1 R/W
2-byte Consume Data Overall Length
(> 0 indicates data is available; BIS M-626_
clears to 0 after data is processed)
2 R/W
MSB = Reader Type
LSB = Command ID
3 R/W
MSB = 0x00
LSB = Node ID (0x01 for the BIS M-626_)
4 R/W
2-byte Timeout Value
(0-65535) measured in milliseconds
5 R/W
2-byte Start Address
(0-65535)
6 R/W
2-byte Read/Block Size
(0-65535 bytes)
7
– 32774
R/W BIS M-626_ Consume Data (when applicable)
32775
– 65536
R/W Reserved
6.2.2 Modbus TCP - Response Packet Structure
Produce Registers hold data that is destined for the host or PLC.
Modbus
Address
(4xxxx / 3xxxx)
Read / Write
Privilege
Register Description
(40001) 1 R/W
2-byte Produce Data Overall Length
(> 0 indicates data is available; Modbus Client
clears to 0 after data is processed)
2 RO
MSB = Reader Type
LSB = Command Echo
3 RO Node ID Number (33 for the BIS M-626_)
4 RO Timeout Value (0-65535)
5 RO Read/Write Start Address (0-65535)
6 RO Read/Block Size (0-65535 bytes)
7
– 32774
RO BIS M-626_ Produce Data (when applicable)
32775
– 65536
RO Reserved