User Manual

52 • I/O Modules
Special Modules
WAGO-I/O-SYSTEM 750
I/O Modules
Active register communication is confirmed by the module in the status byte:
Table 21: Configuration of the status byte
Status byte
Bit 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
Value/
Description
1 0 Register number
Bit Value Description
2
0
- 2
5
Reg. no. Register number
2
6
0 always 0
2
7
1
Always 1 during register communication (confirmation by the bus module)
(Switch between process data communication and register communication)
2.1.1.8.3.2 Parameter Channel for Data Exchange
A common data channel (parameter channel) between the application and the
I/O module is used to exchange parameter sets acyclically and have them
checked by the complex I/O module. In order to access to all available inter-
faces of a coupler/controller, the parameter channel is mapped to the existing
register model. Currently, the parameter channel can be operated with the fol-
lowing interfaces:
• Manual configuration via access to the process image using the con-
trol/status byte
• Software-supported configuration over the asynchronous serial interface of
the coupler/controller (e.g., via WAGO-I/O-CHECK, WAGO-I/O-PRO
CAA)
The parameter channels are mapped through the register of the complex mod-
ule. The following registers are relevant for the user in this case:
• Register 56: Here, parameter data is stored word by word.
• Register 57: Here, the communication control for the data is performed.
The structure of registers 56 and 57 is described in Section 2.1.1.8.3.3.