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10 Industrial Ethernet Communication Adapter Modules (ECAM)
10.2 EtherCAT
PXR Electronic trip unit
01/21 MN012005EN
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109
10.2.1 Configuration of the Modbus parameters
In order to synchronize the communication between the breaker Modbus
RTU (slave device) and the ECAM (which acts as the Modbus RTU master
device), the slave ID (Modbus RTU slave), baud rate and parity bit settings of
both devices must be configured with the same values.
The ECAM’s Modbus RTU slave ID (which the master device addresses to),
baud rate and parity bit settings can be configured via SDOs 0x21F4 - 0x21F6.
Both, Modbus Slave (PXR-RCAM-MRTU-I) and Modbus Master (PXR-ECAM-
ECT) have the same default parameters. In case the Modbus RTU slave
parameters are not changed from the default values, the values of this
communication module do not need to be changed as well. The SDOs
0x21F4 - 0x21F6 only provide the possibility to do so, if desired by the user.
The stop bit is automatically set up and the value is 1.
The default settings of the Modbus Slave and Modbus Master are as follows:
Table 63: EtherCAT settings
The valid parameter values will be applied instantly. Writing parameter values
outside valid ranges has no effect.
After a power-cycle, meaning the switch off the trip unit, the PXR-ECAM-ECT
does not save configured values but returns them to default values.
The Modbus communication parameters of the NZM breaker (Modbus RTU
slave) cannot be configured via Ethernet communication adapter module
(ECAM).
10.2.2 EtherCAT Slave Information file (ESI file)
Each device in an EtherCAT network is associated with an EtherCAT Slave
Information file (an ESI file), which describes the implementation of the
product. This file is used by the network configuration tool during network
configuration.
Setting value
SDO Number
[Hex]
Data range
Default
value
Slave ID
0x21F4
1 - 247
2
Baud rate
0x21F5
00: 9,600 bit/s
01: 19,200 bit/s
02: 38,400 bit/s
03: 57,600 bit/s
01
Parity
0x21F6
00: none
01: odd
02: even
02
→
If necessary, the latest version of the ESI file for the
PXR-ECAM-ECT can be downloaded here:
https://www.eaton.com/digitalnzm