Modbus TCP server
42
COM465IP-COM465DP_D00216_02_M_XXEN/03.2017
6.2.2 Memory scheme of the process image
6.2.2.1 Structure of the process image
As illustrated in the table, the Modbus start address for the respective process image is derived from
the device address. 256 (0x100) words or 512 bytes are reserved for each device. They contain all the
information requested and transmitted from the bus.
Tab. 6.1: Modbus start address for each device for which a request can be sent.
6.2.2.2 Memory scheme of an individual device
Devices can feature various types of analogue and/or digital channels. Please take into consideration
that there are device-specific differences:
BMS devices usually feature 12 channels
MK800/TM800 supports up to 64 digital channels in the master mode
The channels 33 to 64 transmit digital messages only
Use the tables on page 42 and page 43 to determine the start address to query the following device
parameters:
Device type
Timestamp
Common alarm
Device error
BMS channel
Modbus address ranges of the process images in the memory
device address
Word
HiByte LoByte
00
…
FF
10x01 Device 1
2 0x02 Device 2
30x03 Device 3
…… …
32 0x20 Device 32
…… …
255 0xFF Device 255
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