Local process image in delivery state
The process image of the BX and BCxx50 series consists of input, output and flag areas. In addition, there are unallocated data without fixed address. They are created without specifying an address. For these variable types the memory allocation is as follows:
- BCxx50 48 kbyte,
- BC9x20 128 kbyte,
- BXxx00 256 kbyte.
For the allocated data 2048 bytes of input data and 2048 bytes of output data are available. In the default configuration, i.e. in delivery state of the BX5200/BC5250, all connected Bus Terminals are assigned a fixed address. The data for DeviceNet communication are to be found from the address offset 1000dec. The amount of DeviceNet data in the default configuration is 8 bytes.
INPUTS | OUTPUTS |
---|---|
Bus Terminal %IB0 ... | Bus Terminal %QB0 ... |
DeviceNet DATA (PLC variables) %IB1000 ... | DeviceNet DATA (PLC variables) %QB1000 ... |
... %IB2047 maximal | ... %QB2047 maximal |
The maximum number of data via the fieldbus is 128 bytes inputs and outputs for the BC5250 and 256 bytes inputs and outputs for the BX5200.
DeviceNet data
Mode | Read/Write | BX process image |
---|---|---|
polling mode | Rx/Tx | %IB1000...%IB1007/QB1000...%QB1007 |
If you want to use additional data or another mode, then use the TwinCAT configuration or the library for the default configuration.
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
Bus Terminal Controller: 1 x BX5200 or BC5250
Position 1: 1 x KL1012
Position 2: 1 x KL1104
Position 3: 1 x KL2012
Position 4: 1 x KL2034
Position 5: 1 x KL1502
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 | - | - |
Address of the Bus Terminals in the local PLC If you do not know the address of the Bus Terminals that you have assigned to the local PLC (BCxx00): |