Modbus Tcp; Introduction; Configuration - ABB SM1000 User Manual

Videographic recorders

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Videographic Recorders

SM1000 and SM2000

4 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 of the relevant instrument's User Guide, IM/SM1000 or IM/SM2000. 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 24 Comms Analog and

24 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

Fig. 4.1 Selecting Modbus TCP Configuration

Note. The Modbus TCP icon is displayed only if the instrument is fitted with the optional ethernet module.

SM1000 Only

Modbus TCP

SM2000 Only

4 Modbus TCP

IM/SMENET Issue 4

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Sm2000