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and other functions. The data storage area allocation and address coding range are shown in
"Table 3.1".
Table 3.1 Data storage area address table
3.1.4 System diagnosis area
The system diagnosis is divided into two parts. The first part: Address 0x2000-0x200F
has 16 words i.e. 256 bits, which is the "slave station error indication area". The bits
numbered 1-247 correspond to the slave stations with address 1-247. , The bits numbered
248-256 are reserved. When an error occurs in the slave communication, the bit
corresponding to the slave address is set to 1. The corresponding error indication bit will be
automatically cleared after the slave station returns to normal. The data encoding format is
shown in "Table 3.2".
Table 3.2 Coding format of slave error indication area
No.
Storage
category
Description Storage capacity Address range
1 Zone 0 coil 8192 Bit 0x0000~0x1FFF
2 Zone 1 Discrete input 8192 Bit 0x0000~0x1FFF
3 Zone 3 Input register 2048 Word 0x0000~0x07FF
4 Zone 4 Holding register 2048 Word 0x0000~0x07FF
5 Zone 3 System diagnosis 263 Word 0x2000~0x2106
Address
0x2000
BIT Bit15 Bit14 Bit13 Bit12 Bit11 Bit10 Bit9 Bit8
Bit
number
16 15 14 13 12 11 10 9
BIT
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Bit
number
8 7 6 5 4 3 2 1
Address
0x2001
BIT
Bit15 Bit14 Bit13 Bit12 Bit11 Bit10 Bit9 Bit8
Bit
number
32 31 30 29 28 27 26 25
BIT
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Bit
number
24 23 22 21 20 19 18 17