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SERIAL COMMUNICATION (MODBUS)
There are two Modbus addressing modes for variables and configuration parameters:
- GFX compatible
- GFX4/GFW
The modes are selected with dip-switch-7.
GFX-compatible mode (dip-switch-7 =ON)
This lets you uses supervision programs created for Geflex modules.
Memory is organized in at most 3 groups:
-
Zone 1 for the variables of the module GFW-M
-
Zone 2 for the variables of the module GFW-E1
-
Zone 3 for the variables of the module GFW-E2
In each zone, the variables and parameters have the same address as a Geflex instrument; the value (Cod) set on
the rotary switches corresponds to that of Zone 1; the values in the other zones, if expansions are present, are sequential.
Examples:
if the rotary switches have value 14, node 14 addresses Zone 1 (GFW-M), node 15 Zone 2 (GFW-E1), node 16 Zone 3 (GFW-E2).
The power Ou.P for Zone 1 has address Cod 2, the Ou.P for Zone 2 has address Cod+1, 2, etc.
Parameter out.5, which defines the function of output OUT 5 on the GFW, has address Cod 611.
GFX4/GFW mode (dip-switch-7=OFF)
This lets you optimize the efficiency of serial communication by integrating at most 3 zones in the GFW. Memory is
organized in 4 groups: 3 already in GFX-compatible mode, plus one group defined as custom:
-
Custom (additional memory map for dynamic addresses)
-
Zone 1 for the variables of the module GFW-M
-
Zone 2 for the variables of the module GFW-E1
-
Zone 3 for the variables of the module GFW-E2
The custom group contains variables and parameters for a maximum of 120 words. The meaning of these words can
be changed.
There is a single value (Cod) set on the rotary switches; i.e., one for each GFX4/GFW instrument. To access the data
in each zone, simply add an offset to the address (+1024 for Zone 1, +2048 for Zone 2, +4096 for Zone 3).
Words in the custom group have addresses 0,...,119. The variables and parameters are defined by default. At ad-
dresses 200,...,319 we have words containing the value of the address of the corresponding variables or parameters. These
addresses can be changed by the user, offering the ability to read/write data with multi-word messages structured according
to various supervision requirements.
Protection of Maps 1-2
You have to write the value 99 on addresses 600 and 601 to enable
change of the custom group (addresses 200... 319).
This value is reset at each switch-on.
Examples:
you can access the Ou.P variable in Zone 1 with address Cod, 1+1024 or address Cod, 11 custom variable 12 (address Cod,
211 has value 2+1024);
you can access the Ou.P variable in Zone 2 with address Cod, 2+ 2048 or address Cod, 40 custom variable 41 (address Cod,
240 has value 2+2048);
if you want to read the 3 powers in sequence at the first 3 addresses, set Cod, 200 = 1026, Cod.201 = 2050, Cod,202 = 4098.
80997D_MSW_GFW_400-600_04-2021_ENG
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