Process Of Parameter Transmission; Read/Write Parameters (Module Specific) - WAGO -I/O-SYSTEM 750 Manual

2.1.1.10.5

Process of Parameter Transmission

The parameter data exchange between the application and module is made via
a request/response process. The application initiates an instruction using the
toggle bit (TGL_MS != TGL_SM). Afterward, the application polls the
communication control register (R57) of the module until the module
acknowledges the execution of the instruction (TGL_SM == TGL_MS).
2.1.1.10.5.1

Read/Write Parameters (Module Specific)

Request (application)
Parameter
TGL_MS
PRM_RW
MORE_PRM
A0 ... A7
PRM0 ... PRM15
Response (I/O module)
Parameter
TGL_SM
A0...A7
TIMEOUT
BUF_OFL
PRM_ERR
PRM0 ... PRM15
The module uses the error flags TIMEOUT, BUF_OV and PRM_ERR to
report errors during the parameter data exchange.
After the last parameter data has been sent to the module (MORE_PRM =
FALSE), the module checks the entire parameter set and accepts it if
everything is correct. Otherwise, the module returns a parameter error
(PRM_ERR = TRUE).
WAGO-I/O-SYSTEM 750
I/O-Modules
Configuration of the I/O Module via the Parameter Channel
Value Indicates:
!= TGL_SM Initiate instruction
= FALSE Read access
= TRUE Write access
= FALSE Parameter data transmission is completed
= TRUE More parameter data to follow
0 ... (n-1) Parameter address
0 ... 65535 Parameter data write access
Value Indicates
== TGL_MS Instruction completed
0...(n-1) Address parameter data mirrored
FALSE, Monitoring time expired
TRUE
FALSE, Access outside the module parameter range
TRUE
FALSE, Parameter/parameter set error
TRUE
0 ... 65535 Parameter data read access
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