9300 Series User’s Guide

Using the Modbus/TCP Protocol

 

 

You can use the Modbus RTU protocol to write values into ION external numeric, pulse and Boolean modules, allowing you to enable, disable and reset meter functions. You can also use Modbus to change setup register values in various ION modules to configure the meter’s operation.

All of the information required to write to ION registers through Modbus is available in 9300 & 9330 Modicon Modbus Protocol, available on the Technical Documentation CD, or by request from Siemens.

Using the Modbus/TCP Protocol

Modbus/TCP is the newest open Modbus protocol variant (formerly called MBAP). It defines the packet structure and connection port (port 502) for the industry standard TCP/IP protocol. The structure of Modbus/TCP is very similar to the Modbus RTU packet except that it has an extra six-byte header and does not use the cyclic redundancy check (CRC). Some of the newest ION firmware now supports Modbus/TCP for direct communications with the meter.

Modbus/TCP retains the Modbus RTU limit of 256 bytes to a packet. It is suggested that higher through-put is possible if this limitation is removed. This variant is called Enhanced Modbus/TCP but, so far, few devices have moved to support it.

Another variant, that has yet to gain popularity, is from the Semiconductor

Equipment and Materials International (SEMI) trade association. The Generic

Sensor-Bus Sub-Committee created the Sensor/Actuator Network Standard (SEMI

E54-0997).

Modbus TCP Communications

You can now communicate to the meter via Modicon® Modbus TCP (formerly called MBAP). Your meter must have the optional Ethernet port.

Connect to socket 502.

Connect to socket 502

Meter with optional

Ethernet port

Be aware that you cannot form an EtherGate connection to the Modbus TCP network.

Chapter 3 - Default Meter Functionality

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Siemens 9330, 9350, 9300 manual Using the Modbus/TCP Protocol, Modbus TCP Communications
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9300, 9350, 9330 specifications

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