WAGO I/O-SYSTEM 750 Manual page 55

2.1.1.8.3.4 Parameter Sets
For use of the parameter channel; parameter sets are defined and indexed us-
ing parameter addresses (A7...A0). Module-specific parameters (parameters 0
through 249) and general system parameters (parameters 250 through 255) are
differentiated.
2.1.1.8.3.5 Process of Parameter Transmission
The parameter data exchange between the application and bus module is made
via request/response process. The application initiates an instruction using the
toggle bit (TGL_MS != TGL_SM). Afterward, the application queries the
communication control register (R57) of the module until the module confirms
the execution of the instruction (TGL_SM == TGL_MS).
The possible instructions to the parameter interface of the bus module are
listed in the following.
2.1.1.8.3.5.1 Calculate the Maximum Parameter Data of the Bus Module (Sys-
tem Parameters)
Query (application)
Parameter
TGL_MS
PRM_RW
A0...A7
Response (bus module)
Parameter
TGL_SM
A0...A7
PRM0...
PRM15
WAGO-I/O-SYSTEM 750
I/O Modules
Value Description
!= TGL_SM Enter instruction
= FALSE Read access
255 Address of parameter data length
Value Description
== TGL_MS Instruction completed
255 Address of parameter data length mirrored
N Number of parameter data in address area 0...(n-1),
n ∈ {N < 250}
I/O Modules • 55
Special Modules