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FG_F6_MODBUS_EN_01 / 2020-06-17
•
Direct access
In Direct access, the master can only access to bits one by one.
Example for writing the “Chaining” bit to 1 (word 1, bit 14):
Master
Slave
—
Make a
Write N*words
request of 1 word at the
641Fh
address.
On network:
01
10
64
1F
00
01
02
01
00
80
69
01
Slave address
10
Function number (Write N*words)
64 1F
D.A. address of the “Chaining” bit
00 01
Number of words to write
02
Number of bytes to write
01 00
Word: write 0001h (Chaining bit = 1)
80 69
CRC
—
Answer to the request:
On network:
01
10
64
1F
00
01
2F
3F
01
Slave address
10
Function number (Write N*words)
64 1F
D.A. address of the “Chaining” bit
00 01
Number of written words
2F 3F
CRC
Содержание F6 Profinet Series
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