Data Channel For Parameter Exchange; Introduction; Register Structure; Parameter Data (Register 56) - WAGO -I/O-SYSTEM 750 Series Manual

36 • 750-655 [AS-Interface master module]

Data channel for parameter exchange

2.1.1.9 Data channel for parameter exchange
2.1.1.9.1

Introduction

A general data channel between application and bus module is used for the
acyclical exchange of parameter sets and for their checking by the complex
bus module. In order to obtain access via all available interfaces of a bus
coupler or bus controller, the parameter channel is mapped onto the existing
register model. The parameter channel can therefore currently be controlled
via the following interfaces:
• via the control/status byte in the process data exchange
• via the 2-byte process data interface (PLC interface)
• via the exchange of parameters in the case of the respective field bus
• via the asynchronous serial interface of the bus coupler/bus controller (e.g.
The mapping of the parameter channel takes place via registers 56 and 57 of
the appropriate table or the appropriate channel of the complex bus module.
The parameter data are stored word by word in register 56 and the
communication is controlled via register 57. The structure of registers 56 and
57 is described in the following chapters.
2.1.1.9.2

Register structure

2.1.1.9.2.1

Parameter data (Register 56)

Register 56 is used for holding the parameter data that are to be read or
written. Depending on access, the register is written by the bus module (read
parameters) or by the bus coupler (write parameters).
Bit
Parameter PRM7
Bit
Parameter PRM15 PRM14 PRM13 PRM12 PRM11 PRM10 PRM9
PRM0 ...
PRM15
systems (e.g. PROFIBUS-DP/DP-V1)
for 750-101, WAGO-I/O-CHECK 2, WAGO-I/O-PRO 32 and BK-
Service)
Register 56 parameter channel register 0
7 6
2 2
PRM6
15 14
2 2
Parameter data bit 2
5 4 3
2 2 2
PRM5 PRM4 PRM3
13 12 11
2 2 2
0 15
to bit 2
2 1 0
2 2 2
PRM2 PRM1 PRM0
10 9 8
2 2 2
PRM8
WAGO-I/O-SYSTEM 750
I/O Modules