Modbus TCP
6
MODBUS TCP
This chapter shows operating characteristics of the smart relay SRW01-ETH for communication as Modbus TCP
server.
6.1
IP ADDRESS CONFIGURATION
The two addressing switches, close to the Ethernet connectors of the SRW01-ETH, allow setting the configuration
of the IP adress, when Switch
Ê
represents the most significant digit and Switch
Ë
the least significant digit.
Figure 6.1:
Addressing switches
Table 6.1:
Addressing switches configuration for Modbus TCP
Values for switches 1 and
2
Configuration
00h
It configures the interface to use the parameters values P0760 ... P0769.
01h ... FEh
The combination of switches 1 and 2 form the value to configure the last
digit of the IP address (192.168.0.x with subnet mask 255.255.255.0,
gateway and DHCP disabled).
FFh
Reserved.
X
NOTE!
For the changes in this parameter be effective, the equipment must be powered off and on again, or
an update must be performed by P0899.
6.2
INDICATION LEDS
In addition to the LEDs next to the Ethernet connectors, the smart relay SRW01-ETH has the NET LED on the front
of the product to indicate network status. For the Modbus TCP protocol, it has the following indications:
Table 6.2:
Net LED
State
Description
Off
No power or no IP address.
Green, solid
Connection established.
Green, flashing
Waiting for connections.
Red, solid
Fatal error (interface must be reinitialized).
SRW01-ETH | 22
