Fieldbus Configuration - Profibus Slave - Weidmuller WI-GTWY-9 User Manual

WI-GTWY-9-xxx Wireless Gateway
A status location (4500) may be used to give the host device status information about the
Fieldbus Interface. This register will be value 0x0000 if the Fieldbus Interface is "on-line" and
communicating with the fieldbus, or value 0xFFFF if it is "off-line". If you wish to use a status
register, select the "Enable Status Location" box. This register could be mapped to a remote
module or local output as an alarm.

4.10 Fieldbus Configuration - Profibus Slave

The Profibus WI-GTWY-9-xxx-PR1 acts as a Profibus DP Slave - the host device is a Profibus
Master. If you use the WI-GTWY-9-xxx with a PLC, the PLC configuration tool will require a
GSD file so it can recognize the Profibus interface in the WI-GTWY-9-xxx. This file loads into
the PLC configuration software (for example, Siemens STEP 7). The file is available on the
same CD as the configuration software or from the Weidmuller, Inc. web page
www.weidmuller.com.
Configuration of the Profibus Fieldbus Interface comprises allocating a Profibus Slave address to
the WI-GTWY-9-xxx, and configuring links between the Radio Interface and the Fieldbus
Interface (i.e. Fieldbus Mappings).
The Profibus address can be set in the "Fieldbus Config" screen or via the rotary switch on the
end-plate of the module- valid slave addresses are 1 – 126. If the "Enable Rotary Switch" box is
not selected, then the address entered in the program will be used and the rotary switch value
ignored. If the "Enable Rotary Switch" box is selected, then the address entered in the
configuration program will be ignored and the rotary switch read on start-up of the WI-GTWY-9-
xxx.
The Profibus interface has 416 bytes, of which 244 can be used as input bytes, or 244 can be used
as output bytes.
Note: For bit transfers, the bit offset is counted from the least significant bit (LSB) of the byte
(with bit 0 being the LSB) - if you transfer 3 bits with a bit offset of 5, then you will transfer
bits 5-7 of the byte. This is different than the Ethernet unit which counts the offset from the most
significant bit - refer next section.
The fieldbus write mapping in the example below transfers 5x16-bit registers (words) from the
radio interface to the fieldbus interface. Care should be taken that the Profibus Master device
does not attempt to access more I/O than has been setup via fieldbus mappings. i.e. in the
example below, the Profibus Master can read a maximum of 5 words (10 bytes) only from the
WI-GTWY-9-xxx.
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