70
Parameterizing
WAGO-I/O-SYSTEM 750
750-636/000-x00 DC Drive Controller 24V/5A
Manual
Version 2.1.0
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8.3
Parameter Channel
Some I/O modules of the 750 series offer a protocol subsequently referred to as
"parameter channel" for the configuration. Parameter channel provides read
and/or write access to up to 256 parameters, i.e. data words of the respective I/O
module.
The parameters of the I/O module are divided into module-specific parameters
(parameters 0 to 249) and general system parameters (parameters (250 to 255).
The protocol of the parameter channel allows, for example, transfer of parameter
data between the I/O module and a PLC application.
The parameter channel uses register communication to transport data:
•
Register 56: Parameter data is stored here word by word.
•
Register 57: Communication is controlled for the data.
The basic sequence for reading a parameter is:
1.
Write register 57 with the read request command.
2.
Read register 57 to check the execution status.
3.
If the read request was successful: Read register 56 to obtain the requested
data.
The basic sequence for writing a parameter is:
1.
Write register 56 to store the data of the write request.
2.
Write register 57 with the write request command.
3.
Read register 57 to check the execution status.
A more detailed description is available in chapter "Process Image" > "Process of
Parameter Transmission".
8.3.1
Parameter Data (Register 56)
Register 56 contains the parameter data to be read or written. Depending on the
access type, either the I/O module (read parameters) or the fieldbus
coupler/controller (write parameters) write data to register 56.
Table 35: Register 56
Register 56
Bit
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
Parameters
PRM7 PRM6 PRM5 PRM4 PRM3
PRM2
PRM1
PRM0
Bit
2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
Parameters
PRM15 PRM14 PRM13 PRM12 PRM11 PRM10 PRM9
PRM8
PRM0 … PRM15: Parameter data bit 2
0
… bit 2
15
8.3.2
Communication Control (Register 57)
Parameter channel control and diagnostics are done via register 57.
