Modbus Tcp - ABB SM3000 User Manual

SM3000
Multipoint Videographic Recorder

6.4.7 Modbus TCP

Modbus TCP enables Modbus TCP devices to communicate via an ethernet network transferring Modbus messages via TCP/IP.
Communication with standard, serially connected, Modbus RTU devices is also possible through a Modbus TCP Gateway.
The instrument can be configured to act as either a Modbus TCP Server (Slave) or a Modbus TCP Client (Master) device on a
Modbus TCP network.
If configured as a Server, the recorder responds to Modbus queries transferred via the Modbus TCP protocol for the registers
described in Appendix B, page 131. The recorder can be configured for unrestricted access or access can be restricted to a
maximum of 6 Modbus TCP Clients, from defined IP addresses.
If configured as a Client, the recorder collects data from Modbus TCP Servers (or RTUs via a gateway) into its 36 Comms Analog and
36 Comms Digital Channels. Each analog and digital input can be individually configured to any register within any slave device. The
configuration allows for receipt of data in most commonly used data formats
Note. The remaining parameters on this page are displayed only if 'Implementation' (above) is set to 'Modbus TCP Server', i.e.
the instrument is configured to act as a Modbus slave on a Modbus TCP network.
72
Select the required Modbus TCP configuration.
Disabled – Modbus TCP disabled.
Modbus TCP Server– instrument acts as a Modbus Slave
Modbus TCP Client – instrument acts as a Modbus Master
Note. Displayed only if 'Implementation'
Set the TCP/IP port-through used by the Modbus TCP network
– normally port 502.
Select the maximum number
connections permitted:
Unrestricted – any Modbus TCP Client device is permitted to
poll the instrument.
1 (to 6) – only the Modbus TCP client device(s) whose
IP address(es)
'Authorized IP 1' (to 'Authorized IP 6')
parameter(s) (below) is(are) permitted to poll
the instrument.
Note. Displayed only if 'TCP Client Access'
'Unrestricted'.
Enter the IP address(es) of the Modbus TCP Client (Modbus
Master) device(s) that is(are) permitted to poll the instrument for
data.
All analog data is read from the instrument in IEEE format
contained in adjacent registers representing the data in high
word, low word order.
Select 'Yes' to reverse the IEEE data, otherwise select 'No'.
6 Configuration
set to 'Disabled'.
is not
of simultaneous TCP/IP
is(are) entered in the
set to
is not
IM/SM3000–EN Rev. L