Figure 17: Partial Overlay Of Process Data By The Mailbox - Pio - WAGO I/O-SYSTEM 750 Manual

WAGO-I/O-SYSTEM 750
®
750-644 Bluetooth RF-Transceiver
Figure 17: Partial overlay of process data by the Mailbox – PIO
If process data exchange is blocked by the Mailbox for a slot, the other side is
notified. If a 750-644 I/O module receives a corresponding notification from the
otherwise, it indicates such in the status byte of the local PII. The I/O modules
must be in "Real-Time Communication" mode.
If you plan to use the Mailbox during ongoing communication, e.g. for diagnostic
purposes, take note when mapping the Mailbox, process data may be temporarily
overlaid. In such case, you can also carry out the configuration with the 750-644
I/O module configured as the master so that the first slot has no device allocated
to it and the size of the first slow corresponds to the Mailbox size. This means,
however, that one less slave can be linked, but the up-to-dateness of the process
data is not dependent on the masking or unmasking of the Mailbox.
Alternative configuration possible for master only!
This alternative configuration is only possible for the 750-644 I/O module that is
configured as the master. Slave process images always consist of a single slot that
immediately starts with the third byte.
Manual
Version 2.0.0, valid from FW/HW Version 03/03
Process Image 59