Eaton easyE4

10. easyE4 communication Connection to other devices
10.17 Modbus TCP
The value range is 1 to 65535. The default is ID 1.
As specified in the Modbus specification, the start address of a data packet minus 1
(address offset) will be transferred.
Older devices still use this address range and will interpret the transmitted address
with an offset of +1.
On newer devices, such as easyE4 devices, addresses start from start address 0
instead.
If you want to configure Modbus communications with a Modbus server/slave for the
easyE4 base device and the corresponding addresses start from start address 0, then
the Auto-decrement on all addresses option must be disabled. The Modbus cli-
ent's/master's address will be sent without any additional conversion steps and the
address will be the exact same on the Modbus server/slave.
If you want to configure Modbus communications with a Modbus server/slave for the
easyE4 base device and the corresponding addresses start from start address 1, then
you will need to enable the Auto-decrement on all addresses option for the Modbus
server/slave. To ensure that addresses are used correctly, an offset bit of 1 will be
subtracted from all the addresses for the Modbus client/master.
If the Auto-decrement on all addresses option were disabled, the easyE4 would, for
example, send address 1 so that address 2 on the Modbus map would be selected for
the Modbus server/slave if the latter were a device for which addresses start with
start address 1.
easyE402/24 MN050009ENEaton.com
781