User Manual

Table Of Contents
I/O Modules 51
Special Modules
WAGO-I/O-SYSTEM 750
I/O Modules
2.1.1.8.3 Register Communication
Register communication allows direct access to 64 module registers. These
serve exclusively for module configuration on the lowest level. Register com-
munication is active if bit 2
7
is set.
The contents of the register follow the control/status and internal bytes in
D0/D1 of the input/output process image:
Table 19: Setup of the process image during register communication
Byte Word Input process image Output process image
0 0 Control byte Status byte
1 Internal byte Internal byte
2 1 D0 D0
3 D1 D1
2.1.1.8.3.1 Configuration of the Control and Status Bytes
The status byte is configured as follows during register communication:
Table 20: Configuration of the control byte
Control byte
Bit 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
Value/
Description
1
Read/
Write
Register number
Bit Value Description
2
0
- 2
5
Reg. no. Register number (for example, 56 or 57)
0 Read access 2
6
1 Write access
2
7
1 Always 1 during register communication
(Switch between process data communication and register communication)