Chapter 2
Data Exchange
The module can use both fast I/O data and Parameter data. On the Interbus network, Fast I/O data is
represented as Process Data, while Parameter Data is represented as PCP data. On InterBus, there is an
equal amount of Input and Output Process Data. The amount of PCP data is equal to the total I/O
length minus the size of the Process Data, for both Input and Output data.
Note:
Not all Interbus masters, (especially older ones) support PCP-data. In this case, initialise the mod-
ule with Process Data only.
The I/O lengths must be defined before the module can be used on the network. This is accomplished
during initialization of the module. Consult the general Anybus-S Parallel Design Guide for more infor-
mation.
The layout of the default PCP objects are arrays of 32 bytes (Unsigned 8), with no password or group
protection. Objects 0x6000 through 0x603F are linearly mapped to the Parameter Output Data area and
are both readable and writeable by the Interbus master. The objects 0x6040 to 0x607F are linearly
mapped to the Parameter Output Data area and are read only by the Interbus master.
The objects are created to match the amount of Parameter Data indicated in the Anybus Init command.
Example:
If 48 bytes are desired as Output Parameter Data and 15 bytes are desired as input parameter
data, this will result in the following objects:
0x6000 - Array with a length of 32 bytes.
0x6001 - Array with a length of 16 bytes.
0x6040 - Array with a length of 15 bytes.
