User Manual

86 • Fieldbus-specific Additions
DeviceNet
WAGO-I/O-SYSTEM 750
I/O Modules
5.2 DeviceNet
5.2.1 Process Image Access
The DeviceNet master can access the Bluetooth
®
data in two ways.
With predefined instances of the assembly object, digital and analog input and
output data of a node are transmitted with a command to, or from, the master.
The application in the master can then address the data in the memory. The
data is stored in the master as it is for mapping in the coupler/controller. The
byte-oriented module data (analog modules and special modules) and the bit-
oriented module data (digital modules) are separated according to input and
output image in the memory in "arrays of byte". Therefore, the corresponding
array and associated memory address can be determined from module type.
The data in the Bluetooth
®
module can be directly addressed with the analog
input point object or the analog output point object. The instance number of
the respective object is based on the position of the module in the node.
5.2.1.1 Example
A node contains the following modules with input and output process image:
3 x 750-402 for every 4 bits of input data,
1 x 750-452 4 bytes of input data,
1 x 750-644 12 bytes of input and 12 bytes of output data,
1 x 750-550 4 bytes of output data,
1 x 750-452 4 bytes of input data,
1 x 750-550 4 bytes of output data,
1 x 750-452 4 bytes of input data,
1 x 750-504 4 bits of output data.
The Bluetooth
®
module uses a process image of 12 bytes with a mailbox size
of 6 bytes. The mailbox is unmasked.