BECKHOFF BC3150 - Manual (Page 59)

Safety Instructions
Fieldbus Components 57
Local process image in delivery state
The process image of the BX controller consists of an input, output and flag area. In addition, there are unallocated
data without fixed address. They are created without specifying an address. For this type of variable, 256 kbyte (48
kbyte BCxx50) of memory are available on the BX Controller. The maximum size of a variable or structure (array) is
16 kbyte. For the allocated data 2048 bytes of input data and 2048 bytes of output data are available. The BX has 4
kbyte of memory for the allocated flag area. In the delivery state (default configuration) of the BX, fixed addresses are
allocated for all connected Bus Terminals. The data for PROFIBUS communication start from address offset 1000
dec
.
The length of the PROFIBUS data depends on the number of configured data. The maximum length is 244 bytes
(BX3100) / 128 bytes (BC3150).
Inputs Outputs
Bus Terminal %IB0 ... Bus Terminal %QB0 ...
PROFIBUS data (PLC variable) %IB1000 ... PROFIBUS data (PLC variables) %QB1000 ...
... %IB2047 Maximal ... %QB2047 Maximal
Addressing of the connected Bus Terminals
The default setting is for all the connected Bus Terminals to be assigned to the local process image. Mapping within
the Bus Terminal Controller is carried out according to the following rule:
First come all the complex Bus Terminals, in whatever sequence they are physically inserted, followed by the digital
Bus Terminals which are padded to a whole byte. The default mapping of the complex Bus Terminals is:
•
complete evaluation
•
Intel format
•
Word alignment
Example structure
Bus Terminal Controller: 1 x BXxxxx/BCxx50
Position 1: 1 x KL1012
Position 2: 1 x KL1104
Position 3: 1 x KL2012
Position 4: 1 x KL2034
Position 5: 1 x KL1501
Position 6: 1 x KL3002
Position 7: 1 x KL4002
Position 8: 1 x KL6001
Position 9: 1 x KL9010
Process image
Bus Terminal Position Input image Output image
KL1501 5 %IB0...%IB5 %QB0...%QB5
KL3002 6 %IB6...%IB13 %QB6...%QB13
KL4002 7 %IB14...%IB21 %QB14...%QB21
KL6001 8 %IB22...%IB29 %QB22...%QB29
KL1012 1 %IX30.0..30.1 -
KL1104 2 %IX30.1..30.5 -
KL2012 3 - %QX30.0..30.1
KL2034 4 - %QX30.2..30.5
KL9010 9 - -