Fieldbus system
BC9000 and BC910072 Version: 4.0.0
Error Answer Counter (Subfunction 13)
This counter contains the number of error answer telegrams that the coupler has sent.
Sub-function Data field (query) Data field (response)
0x000D 0x0000 Counter value
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 Data field (query) Data field (response)
0x000E 0x0000 Counter value
Number of unanswered telegrams (Subfunction 15)
Contains the number of answers that the slave has not sent.
Sub-function Data field (query) Data field (response)
0x000F 0x0000 Counter value
Number of Error Answers (Subfunction 16)
Contains the number of error answers that the slave has sent.
Sub-function Data field (query) Data field (response)
0x0010 0x0000 Counter value
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 Sample
Function code 15
Start address high 0
Start address low 0
Length high 0
Length low 20
Byte count 3
Data 1 bit 0..7 255
Data 2 bit 8..15 255
Data 3 bit 16..23 0
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