Beckhoff BC9000 Documentation page 72

Fieldbus system
Error Answer Counter (Subfunction 13)
This counter contains the number of error answer telegrams that the coupler has sent.
Sub-function
0x000D
The following functions contain the counter states for various units. This means that the Modbus telegrams
can be distinguished through their units, if, for example, a coupler is accessed by different masters.
Slave Answers (Subfunction 14)
Contains the number of answers that the slave has sent.
Sub-function
0x000E
Number of unanswered telegrams (Subfunction 15)
Contains the number of answers that the slave has not sent.
Sub-function
0x000F
Number of Error Answers (Subfunction 16)
Contains the number of error answers that the slave has sent.
Sub-function
0x0010
7.5.4.9 Force multiple coils (Function 15)
The Force multiple coils function can be used to set or reset a number of digital outputs at the same time.
The first 20 digital outputs are written in this example. The digital outputs start at an offset of 0x0000. Here
the offset always describes a bit. Offset 0x0003 writes to the fourth bit in the output process image. The
length indicates the number of bits, and the Byte count is composed from the combination all the bytes that
are to be written.
Sample: 20 bits count is 3 bytes (round up to the nearest byte)
The data bytes contain the values for the individual bits. In this example, the bits 0 to 15 are set to TRUE,
while bits 17 to 20 are set to FALSE.
Query
Byte name
Function code
Start address high
Start address low
Length high
Length low
Byte count
Data 1 bit 0..7
Data 2 bit 8..15
Data 3 bit 16..23
72
Data field (query)
0x0000
Data field (query)
0x0000
Data field (query)
0x0000
Data field (query)
0x0000
Sample
15
0
0
0
20
3
255
255
0
Version: 4.0.0
Data field (response)
Counter value
Data field (response)
Counter value
Data field (response)
Counter value
Data field (response)
Counter value
BC9000 and BC9100