WAGO I/O-SYSTEM 750 Manual page 45

With Mailbox
Received process image
Control/status byte
Byte internally used
Figure 14: Unmasking of the mailbox response in the input process image
Process data in the output process image is also masked when the mailbox is
activated. As long as the mailbox is active, the affected data areas are no
longer updated. Unmasked data areas continue to be updated.
Without Mailbox
With Mailbox
Figure 15: Unmasking of the mailbox response in the input process image
The cyclic transmission of process images is not influenced by an active mail-
box. Received data may be aged, however, by a superimposed mailbox. This
is signaled to the remote device in the Bluetooth
confirms this status, on its end, in the control/status byte (see Section
2.1.1.8.1.1). If the mailbox bit of the remote slave is set, then all (in the slave)
or parts (in the master) of the displayed process data may be aged.
WAGO-I/O-SYSTEM 750
I/O Modules
Mailbox
Send process image to slave
Control/status byte
Byte used internally
Send process image to slave
Control/status byte
Byte used internally
Superposed
by mailbox
Slot is not updated since
superposed by mailbox
Slot 2 Slot 3
Process images of the remote devices
Input process image
Cutoff size
Update process image
Slot 1 Slot 2 Slot 3
Process images of the remotedevices
Output process image
Superposed by mailbox
Process image is not updated
since superposed by mailbox
Mailbox Slot 2 Slot 3
Process images of the remotedevices
Output process image
I/O Modules
Special Modules
Slot 4
Slot 4
Slot 4
®
header. The remote device
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