Configuration Of A Bluetooth; Piconet - WAGO I/O-SYSTEM 750 Manual

58 • Configuration of a Bluetooth® Piconet
Special Modules

3 Configuration of a Bluetooth

To configure a piconet, connect 2 to 8 Bluetooth
doing so, there is some important framework data to consider:
Is real-time or ad hoc communication beneficial for your application?
Is the data that you wish to transmit time-critical data?
Also important, how many WAGO Bluetooth
nal Bluetooth
devices are to be connected with each other, you can connect one master with
seven slaves. This only applies for the real-time profile, however. In the ad
hoc profile, you can connect up to six WAGO slaves. If you also want to use
external Bluetooth
profile, seven WAGO devices and six external devices can be linked, but only
a maximum of seven devices can actively exchange data at the same time.
In preparation for configuration, note which Bluetooth
which role (master/slave), what the MAC addresses of the devices are and
which communication profile is to be set (real-time/ad hoc). This makes the
overview easier for you.
These considerations will determine the allocation of the devices to available
slots in the master process image. These are available for the data exchange.
In a later step, you will determine the number of bytes (cutoff size) for each
slot that should be available in the master process image for data exchange.
Only the process data allocated to the slots will be transmitted wirelessly.
Therefore, your configuration will work most efficiently if slave devices are
set to the smallest possible process image size. The smallest possible process
image size for a slave corresponds to the smallest setting for its process image
size, which is the same or larger [2 + cutoff of the corresponding slot].
After drafting your configuration in the previous steps, you can now synchro-
nize the device configurations to each other. To do this, first configure the
process image and mailbox size.
The mailbox size determines which mailbox commands can be executed. To
configure with WAGO-I/O-CHECK or building blocks of the WAGO-I/O-
PRO CAA, you can choose each available mailbox size independently of limi-
tations of the fieldbus. For a successful configuration, a mailbox size of at
least 12 bytes is necessary. If you want all diagnostic commands available to
the full extent, set it for 18 bytes. If you are using a fieldbus over which less
than 20 bytes per data element can be transmitted (e.g. CANopen), you should
reduce the mailbox size again to an appropriate size after successfully com-
pleting the device configuration.
If you plan to use the mailbox during ongoing communication; e.g., for diag-
nostic purposes, take note that when unmasking the mailbox, process data may
be temporarily covered (see Section 2.1.1.8.2.1, "Aging of data by the mail-
®
modules are to communicate with each other: If only WAGO
®
devices in your piconet, choose the ad hoc profile. In this
®

Piconet

®
devices with each other. In
®
modules and how many exter-
®
device will take over
WAGO-I/O-SYSTEM 750
I/O Modules