Configuration - Weidmuller WI-GTWY-9 User Manual

WI-GTWY-9-xxx Wireless Gateway
The WI-GTWY-9-xxx Modbus Plus supports the following exception responses:
- (0x01) Illegal function for the addressed slave
- (0x02) Illegal data address within the information field for the addressed slave
- (0x03) Illegal data value in the information field for the addressed slave
The WI-GTWY-9-xxx Modbus Plus supports up to 1024 words of output data and 1024 words of
input data. Converting this to 40000 registers, the possible output registers (Data To Network)
range is 40001 – 41024 of which the first 32 words (i.e. 40001 – 40032) are global output data.
However all output registers, including the global output registers, may also be read from the
module using the point-to-point command Read Holding Registers (0x03). The possible input
registers (Data From Network) range is 41025 – 42048 of which the first 32 words (i.e. 41025 –
41056) is global input data (i.e. data extracted from another network device's global output data).
Only data not assigned to global input data (i.e. 41057 – 42048) may be written by the point-to-
point preset register commands.

4.14.4 Configuration

The "Node Address" will be the Modbus Plus network address of the WI-GTWY-9-xxx,
(allowable values are 1 – 64) and must be unique for the network segment. The "Source
Address" will be the Modbus Plus network address of another module on the network from
which the WI-GTWY-9-xxx will extract Global Data (i.e. Data From Network). Only 1 source
address can be added to the configuration (i.e you can only extract data from one source device).
"GDB I/P Count" (up to 32 words max) specifies the amount of Global Data to extract from the
"Source Address" each cycle. An offset into the source unit's global data ("GDB I/P Offset")
may also be specified in order to read a specific portion of the 32 word global data of the source
address. However, since only 32 words max of global data are produced, the sum of GDB I/P
Offset and GDB I/P Count must never exceed 32. After setting these parameters, the WI-GTWY-
9-xxx I/O Registers must be linked to Modbus Plus 40000 registers with appropriate "Fieldbus
mappings".
In the below example there is one "Fieldbus Write Mapping" (this will make available Data To
Network) and one "Fieldbus Read Mapping" (this will make available Data From Network).
When adding mappings, software will automatically adjust the available 40000 register address
range depending on the command type (i.e. read or write fieldbus mapping), see below.
The I/O Register selection below for the fieldbus read mapping illustrates the allowable 40000
register address range base upon the chosen command type.
The fieldbus write mapping links the 48 I/O registers 0 – 47 to the fieldbus interface 4X registers
40001 – 40048. As described earlier, fieldbus interface registers 40001 – 40032 are always
assigned as Global Data Out registers (i.e. Data To Network), these registers will be broadcast to
the network on each token rotation cycle. The remaining registers (40033 – 40048) can be
accessed via Modbus 40000 point-to-point Read Register commands described in section 4.14.3
NOTE - the option also exists for the Global Data output registers 40001 – 40032 to be read by
the point-to-point commands also.
The fieldbus read mapping links the 48 fieldbus interface registers 41025 – 41072 to the I/O
registers 50 – 97. As described earlier, fieldbus interface registers 41025 – 41056 are always
assigned as Global Data In registers (i.e. Data From Network). These registers will be filled with
Global Data broadcast by the "Source Unit" according to the "GDB I/P Offset" and "GDB I/P
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