Memory Scheme Of The Process Image - Bender COMTRAXX CP9 Series Manual

4.2.2 Memory scheme of the process image

4.2.2.1 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 reques-
ted and transmitted from the bus.
Device address
1
2
3
...
32
...
255
Tab. 4.1: Modbus start address for each device for which a request can be sent.
4.2.2.2 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 Seite 23 and Seite 24 to determine the start address to request the following device parame-
ters:
Device type

Timestamp

Common alarm

Device error

BMS channel

CP9xx_D00349_07_M_XXEN/01.2020
Modbus address ranges of the process images in the memory
Word
HiByte LoByte
...
00
0x01 Device 1
0x02 Device 2
0x03 Device 3
... ...
0x20 Device 32
... ...
0xFF Device 255
FF
23