User Manual

Table Of Contents
I/O Modules 31
Special Modules
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.8 Process Image
Process data communication using the Bluetooth
®
protocol is cyclic. Data is
requested, processed in a fixed sequence and exchanged between master and
slaves.
For configuration, diagnosis and register communication, data is transmitted
acyclically between modules and locally connected applications - but not
wirelessly (see Figure 8).
Both the cyclic and acyclic communication share a transmission channel - the
process image.
Fieldbus
WAGO-I/O-CHECK
WAGO-I/O- CAAPRO
Fieldbus
WAGO-I/O-CHECK
WAGO-I/O- CAAPRO
Bluetooth
®
Module
(cyclic)
Process image
Process image
Configuration,
Diagnostics
(acyclic)
Configuration,
Diagnostics
(acyclic)
Radio Channel
Bluetooth
®
Module
Process data exchange
Figure 8: Cyclic and acyclic communication g064407e
The size of the process image for the Bluetooth
®
module can be set as a fixed
size, 12, 24 or 48 bytes. The process image contains 2 bytes of control infor-
mation consisting of a control / status byte and an internally used byte.
The mailbox is superimposed in a size of 6, 12 or 18 bytes on the Bluetooth
®
process data as long as the control bit (0x20) is set.
Mailbox and process image sizes are set either via startup tool WAGO-I/O-
CHECK or by using WAGO-I/O-PRO CAA over the address 0 in the parame-
ter channel.
Table 10 explains the breakdown of the data in process data and register com-
munication.