User Manual

Table Of Contents
I/O Modules 33
Special Modules
WAGO-I/O-SYSTEM 750
I/O Modules
If the mailbox bit (bit 2
5
in the control byte) is set to masked mailbox (see
Table 10), the mailbox is masked by the cyclical data field. The masked field
is then no longer valid; however, the non-masked field continues to be up-
dated and may be used. If the mailbox flag is not set, the mailbox is masked
and the cyclical data field is valid. The desired setting is confirmed by mirror-
ing in bit 2
5
of the status byte.
Note
Consider the validity of the data areas in your application program
(WAGO-I/O-PRO CAA).
To activate register communication (see Table 10), bit 2
7
in the control byte
is set. Resetting this bit switches the register communication off again. The se-
lected setting is mirrored in bit 2
7
of the status byte. The register data is cov-
ered with an offset and a size of 2 bytes by the respective cyclic or acyclic
(covered by the mailbox) memory area.
Attention
During register communication, the mailbox and process data are invalid!
In the following Sections 2.1.1.8.1 and 2.1.1.8.3, the different types of com-
munication between Bluetooth
®
modules are described. You can find an over-
view in Table 11.
Table 11: Overview of types of communication
Type of communication Configuration of the control / status byte
Process data communication
without mailbox
Control byte
Status byte
no bit set (0x00)
no bit set (0x00)
(contains additional diagnostic informa-
tion, see Section
2.1.1.8.1.1)
Process data communication
with mailbox
Control byte
Status byte
Bit 2
5
set (0x20)
Bit 2
5
and 2
6
set (0x60)
(contains additional diagnostic informa-
tion, see Section
2.1.1.8.1.1)
Register Communication
Control byte
Status byte
Bit 2
7
set (0x80)
Bit 2
7
set (0x80)
(contains additional information, e.g. the
register number, see Section
2.1.1.8.3.1)