Process Image; Figure 10: Cyclic And Acyclic Communication - WAGO I/O-SYSTEM 750 Manual

WAGO-I/O-SYSTEM 750
®
750-644 Bluetooth RF-Transceiver
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Process Image

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The process image of the 750-644 I/O module is used to exchange data with,
configure, parameterize and diagnose devices connected wirelessly.

Figure 10: Cyclic and acyclic communication

The size of the process image of the 750-644 I/O module is always identical for
input and output data. Possible settings are 12, 24 and 48 bytes.
Depending on the current configuration of the 750-644 I/O module and how it is
used, the process image is divided into various segments: Fixed components are a
control/status byte (C/S byte) and a null byte. The rest of the process image can be
used for register communication, Mailbox configuration or process data exchange
(see also figure "Segments of the Process Image").
If the process image is used for register communication, it is not available
•
for data exchange with remote Bluetooth
the 750-644 I/O module using the Mailbox protocol. Regardless of the
operating mode, all bytes of the process image are invalid that are not
occupied by data for register communication.
• In "Configuration" mode, the Mailbox protocol can be used for
configuration. For this purpose, the Mailbox is activated using a bit in
control byte C0. If the Mailbox is activated, it occupies 6, 12 or 18 bytes in
the process image. The 750-644 I/O module populates any remaining bytes
with 0.
• In "Real-Time Communication" and "Ad-hoc Communication" modes, up
to 7 segments of configurable size (hereafter also referred to as "slots") are
available for exchanging process data with remote Bluetooth
The Mailbox can also be activated in both operating modes and then over-
Manual
Version 2.0.0, valid from FW/HW Version 03/03
Process Image
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SPP devices or for configuring
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45
SPP devices.