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Appendix 24
BK5200
Input data
in the bus coupler
I0
...
byte-oriented data
...
I3
I4
...
bit-oriented data
...
I6
The base addresses I0 and O0 listed here are used as relative addresses
or addresses in the bus coupler. If you have an appropriate superordinate
Profibus system you can use the bus master to enter these addresses at
any desired position in the process image of the control unit. You can use
the configuration software of the master to assign the bytes to the addres-
ses in the process image of the control unit.
Representation of analog signals in the
process image
Three input bytes and three output bytes are required in the process image
for each analog channel. Two bytes represent the value as an unsigned
integer, i.e. 15 bits and sign. This data format is used regardless of the
actual resolution. For example, with 12-bit resolution, the least significant
four bits are meaningless. The low value byte has control and status func-
tions. You can use the control byte to set up various operating modes. The
lowest six bits can be used as the address bits for writing and reading a
register set using string communications. A register set consists of 64 regi-
sters.
I/O bytes of an analog
Output byte 1 Output byte 0 Control byte
channel in the process
image
Input byte 1 Input byte 0 Status byte
Significance of the
BIT 7 0 = NORMAL MODE, 1 = CONTROL MODE
control/status bytes
BIT 6
0 = READ, 1 = WRITE
for accessing
BIT 5
Register address, MSB
the register model
BIT 4
Register address
BIT 3
Register address
BIT 2
Register address
BIT 1
Register address
BIT 0
Register address, LSB
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