RMG ERZ2000-NG, Operating Manual

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4 Communication and bus systems
Manual ERZ 2000-NG · EN07 · 2019, May 13th
146
Example of a standard setting in practice:
Device fulfills the function control station on the DSfG bus: all switches to ON
Device not on an end of the DSfG bus:
Switches 2 and 3 to ON
Caution
The bus termination resistors must be activated externally at the star dis-
tributors or at the start and end of the main cable.
An example of a comparison of two computers is provided in
annex .J.1.2
Cross-comparison via DSfG
4.3 MODBUS
4.3.1 Concept
Note
There is an arbitrarily definable (configurable) range of 100 MODBUS registers
in the ERZ2000-NG, the
MODBUS super block
There is a freely definable (configurable) range of 100 MODBUS registers in the
ERZ2000-NG which can be pre-assigned with a factory setting (default) of 50 values
of 4 bytes each. The contents of these 100 registers can be changed by the user at
any time. This freely configurable range is called MODBUS super block. This Modbus
super block is located in menu
II Modbus super block (
Figure 104: Modbus super
block
). All data in the super block is stored in successive register addresses with
successive numbers. Therefore, quick data transmission is possible without individual
queries. The super block can be assigned with an offset. In addition, there is a fixed
range assigned with the most important data for the user. These registers cannot be
changed by a configuration. The fixed range connects directly to the super block and
shifts automatically with the offset.
Change of data in the super block: