User manual

105G Wireless Gateway User Manual
Elpro_man_105g_1.18.doc Page 130
Finally, it must be taken into consideration that the 105G Modbus Plus module dynamically
adjusts the 4X register range available to the network depending on the fieldbus mappings
configured. The 105G will terminate the available 4X register range at the last mapped 4X
register for both the read and write area. In the example above this means that the only 4X
registers that are available to the Modbus Plus network are 40001 – 40048 and 41025 – 41072.
NOTE – considering this constraint, it is still strongly advised to use fieldbus interface registers
always starting at the lowest addressed locations, thus limiting unnecessary processing overhead
on the 105G.