User Manual

Table Of Contents
I/O Modules 45
Special Modules
WAGO-I/O-SYSTEM 750
I/O Modules
Slot is not updated since
superposed by mailbox
Process images of the remote devices
Input process image
Superposed
by mailbox
With Mailbox
Received process image
Control/status byte
Byte internally used
Mailbox Slot 2 Slot 3 Slot 4
Figure 14: Unmasking of the mailbox response in the input process image g064414e+89e
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 As long as the mailbox is active, the affected data areas are no
longer updated.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.
Send process image to slave
Update process image
Process images of the remotedevices
Output process image
Control/status byte
Byte used internally
Process image is not updated
since superposed by mailbox
Process images of the remotedevices
Superposed by mailbox
With Mailbox
Send process image to slave
Cutoff size
Without Mailbox
Output process image
Control/status byte
Byte used internally
Slot 1 Slot 2 Slot 3 Slot 4
Mailbox Slot 2 Slot 3 Slot 4
Figure 15: Unmasking of the mailbox response in the input process image g064415e
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
®
header. The remote device
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.