User Manual

I/O Modules • 55
Special Modules
WAGO-I/O-SYSTEM 750
I/O Modules
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 Value Description
TGL_MS != TGL_SM Enter instruction
PRM_RW = FALSE Read access
A0…A7 255 Address of parameter data length
Response (bus module)
Parameter Value Description
TGL_SM == TGL_MS Instruction completed
A0…A7 255 Address of parameter data length mirrored
PRM0...
PRM15
N Number of parameter data in address area 0...(n-1),
n ∈ {N < 250}