Proconx Easygen 3000 Series Quick Start Manual

Modbus register address ranges re-mapped for the Easygen
using proconX gateways
Application Note 308
Revision 1, March 2011
Solution 1: Modbus/TCP ........................................................................................................................... 1
Solution 2: Serial Modbus ........................................................................................................................ 3
proconX offers two gateways which are well suited to complement the range of Woodward genset
controls like the Easygen-3000 series.
Both gateways offer alternative Modbus register ranges in addition to the default range of 50000.
This is of particular interest if Modbus equipment is used which cannot address registers above
a certain range.
Depending on the application and protocol used, either the ESENET or the MBRG-300 gateway
may be best suited.
Solution 1: Modbus/TCP
If Modbus/TCP is used as protocol, then the proconX ESENET gateway can be used.
Since firmware 0.4 the ESENET offers alternative access as Input Registers in the start address range
from 1 to 271. The table below shows that the Visualisation Data can be accessed at three different
locations. Either as Holding Registers or Input Registers (address block offset 4:00000, Modbus
function code 03) at the standard start address 50001 or as Input Registers (address block offset
3:00000, Modbus function code 04) at start address 1.
The following diagram illustrated how the gateway is integrated into the CAN network:
MODBUS/TCP CAN
PLC
ESENET
Easygen controls
Figure 1: ESENET gateway inserted into the CAN network offering Modbus/TCP access
AN308-1102
1